1
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Vecchio F, Carré A, Korenkov D, Zhou Z, Apaolaza P, Tuomela S, Burgos-Morales O, Snowhite I, Perez-Hernandez J, Brandao B, Afonso G, Halliez C, Kaddis J, Kent SC, Nakayama M, Richardson SJ, Vinh J, Verdier Y, Laiho J, Scharfmann R, Solimena M, Marinicova Z, Bismuth E, Lucidarme N, Sanchez J, Bustamante C, Gomez P, Buus S, You S, Pugliese A, Hyoty H, Rodriguez-Calvo T, Flodstrom-Tullberg M, Mallone R. Coxsackievirus infection induces direct pancreatic β cell killing but poor antiviral CD8 + T cell responses. Sci Adv 2024; 10:eadl1122. [PMID: 38446892 PMCID: PMC10917340 DOI: 10.1126/sciadv.adl1122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 01/30/2024] [Indexed: 03/08/2024]
Abstract
Coxsackievirus B (CVB) infection of pancreatic β cells is associated with β cell autoimmunity and type 1 diabetes. We investigated how CVB affects human β cells and anti-CVB T cell responses. β cells were efficiently infected by CVB in vitro, down-regulated human leukocyte antigen (HLA) class I, and presented few, selected HLA-bound viral peptides. Circulating CD8+ T cells from CVB-seropositive individuals recognized a fraction of these peptides; only another subfraction was targeted by effector/memory T cells that expressed exhaustion marker PD-1. T cells recognizing a CVB epitope cross-reacted with β cell antigen GAD. Infected β cells, which formed filopodia to propagate infection, were more efficiently killed by CVB than by CVB-reactive T cells. Our in vitro and ex vivo data highlight limited CD8+ T cell responses to CVB, supporting the rationale for CVB vaccination trials for type 1 diabetes prevention. CD8+ T cells recognizing structural and nonstructural CVB epitopes provide biomarkers to differentially follow response to infection and vaccination.
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Affiliation(s)
- Federica Vecchio
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Alexia Carré
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Daniil Korenkov
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Zhicheng Zhou
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Paola Apaolaza
- Institute of Diabetes Research, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich-Neuherberg, Germany
- German Center for Diabetes Research (DZD e.V.), Neuherberg, Germany
| | - Soile Tuomela
- Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | | | - Isaac Snowhite
- Diabetes Research Institute, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | | | - Barbara Brandao
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Georgia Afonso
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Clémentine Halliez
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
- Assistance Publique Hôpitaux de Paris, Service de Diabétologie et Immunologie Clinique, Cochin Hospital, Paris, France
| | - John Kaddis
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- Department of Diabetes and Cancer Discovery Science, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Sally C. Kent
- Diabetes Center of Excellence, Department of Medicine, University of Massachusetts Medical Chan School, Worcester, MA, USA
| | - Maki Nakayama
- Barbara Davis Center for Diabetes, University of Colorado School of Medicine, Aurora, CO, USA
| | - Sarah J. Richardson
- Islet Biology Exeter (IBEx), Exeter Centre of Excellence for Diabetes Research (EXCEED), Department of Clinical and Biomedical Sciences, University of Exeter Medical School, Exeter, UK
| | - Joelle Vinh
- ESPCI Paris, PSL University, Spectrométrie de Masse Biologique et Protéomique, CNRS UMR8249, Paris, France
| | - Yann Verdier
- ESPCI Paris, PSL University, Spectrométrie de Masse Biologique et Protéomique, CNRS UMR8249, Paris, France
| | - Jutta Laiho
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | | | - Michele Solimena
- German Center for Diabetes Research (DZD e.V.), Neuherberg, Germany
- Paul Langerhans Institute Dresden (PLID), Helmholtz Munich, University Hospital and Faculty of Medicine, TU Dresden, Dresden, Germany
| | - Zuzana Marinicova
- German Center for Diabetes Research (DZD e.V.), Neuherberg, Germany
- Paul Langerhans Institute Dresden (PLID), Helmholtz Munich, University Hospital and Faculty of Medicine, TU Dresden, Dresden, Germany
| | - Elise Bismuth
- Assistance Publique Hôpitaux de Paris, Service d’Endocrinologie Pédiatrique, Robert Debré Hospital, Paris, France
| | - Nadine Lucidarme
- Assistance Publique Hôpitaux de Paris, Service de Pédiatrie, Jean Verdier Hospital, Bondy, France
| | - Janine Sanchez
- Department of Pediatrics, Division of Pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
| | - Carmen Bustamante
- Department of Pediatrics, Division of Pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
| | - Patricia Gomez
- Department of Pediatrics, Division of Pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
| | - Soren Buus
- Department of Immunology and Microbiology, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
| | - the nPOD-Virus Working Group
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
- Institute of Diabetes Research, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich-Neuherberg, Germany
- German Center for Diabetes Research (DZD e.V.), Neuherberg, Germany
- Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
- Diabetes Research Institute, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- Assistance Publique Hôpitaux de Paris, Service de Diabétologie et Immunologie Clinique, Cochin Hospital, Paris, France
- Department of Diabetes and Cancer Discovery Science, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- Diabetes Center of Excellence, Department of Medicine, University of Massachusetts Medical Chan School, Worcester, MA, USA
- Barbara Davis Center for Diabetes, University of Colorado School of Medicine, Aurora, CO, USA
- Islet Biology Exeter (IBEx), Exeter Centre of Excellence for Diabetes Research (EXCEED), Department of Clinical and Biomedical Sciences, University of Exeter Medical School, Exeter, UK
- ESPCI Paris, PSL University, Spectrométrie de Masse Biologique et Protéomique, CNRS UMR8249, Paris, France
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Paul Langerhans Institute Dresden (PLID), Helmholtz Munich, University Hospital and Faculty of Medicine, TU Dresden, Dresden, Germany
- Assistance Publique Hôpitaux de Paris, Service d’Endocrinologie Pédiatrique, Robert Debré Hospital, Paris, France
- Assistance Publique Hôpitaux de Paris, Service de Pédiatrie, Jean Verdier Hospital, Bondy, France
- Department of Pediatrics, Division of Pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
- Department of Immunology and Microbiology, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
- Indiana Biosciences Research Institute, Indianapolis, IN, USA
- Fimlab Laboratories, Tampere, Finland
- Department of Pediatrics, Tampere University Hospital, Tampere, Finland
| | - Sylvaine You
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
- Indiana Biosciences Research Institute, Indianapolis, IN, USA
| | - Alberto Pugliese
- Diabetes Research Institute, Leonard Miller School of Medicine, University of Miami, Miami, FL, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Heikki Hyoty
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Fimlab Laboratories, Tampere, Finland
- Department of Pediatrics, Tampere University Hospital, Tampere, Finland
| | - Teresa Rodriguez-Calvo
- Institute of Diabetes Research, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich-Neuherberg, Germany
- German Center for Diabetes Research (DZD e.V.), Neuherberg, Germany
| | - Malin Flodstrom-Tullberg
- Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Roberto Mallone
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
- Assistance Publique Hôpitaux de Paris, Service de Diabétologie et Immunologie Clinique, Cochin Hospital, Paris, France
- Indiana Biosciences Research Institute, Indianapolis, IN, USA
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2
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Vecchio F, Carré A, Korenkov D, Zhou Z, Apaolaza P, Tuomela S, Burgos-Morales O, Snowhite I, Perez-Hernandez J, Brandao B, Afonso G, Halliez C, Kaddis J, Kent SC, Nakayama M, Richardson SJ, Vinh J, Verdier Y, Laiho J, Scharfmann R, Solimena M, Marinicova Z, Bismuth E, Lucidarme N, Sanchez J, Bustamante C, Gomez P, Buus S, You S, Pugliese A, Hyoty H, Rodriguez-Calvo T, Flodstrom-Tullberg M, Mallone R. Coxsackievirus infection induces direct pancreatic β-cell killing but poor anti-viral CD8+ T-cell responses. bioRxiv 2023:2023.08.19.553954. [PMID: 37662376 PMCID: PMC10473604 DOI: 10.1101/2023.08.19.553954] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
Coxsackievirus B (CVB) infection of pancreatic β cells is associated with β-cell autoimmunity. We investigated how CVB impacts human β cells and anti-CVB T-cell responses. β cells were efficiently infected by CVB in vitro, downregulated HLA Class I and presented few, selected HLA-bound viral peptides. Circulating CD8+ T cells from CVB-seropositive individuals recognized only a fraction of these peptides, and only another sub-fraction was targeted by effector/memory T cells that expressed the exhaustion marker PD-1. T cells recognizing a CVB epitope cross-reacted with the β-cell antigen GAD. Infected β cells, which formed filopodia to propagate infection, were more efficiently killed by CVB than by CVB-reactive T cells. Thus, our in-vitro and ex-vivo data highlight limited T-cell responses to CVB, supporting the rationale for CVB vaccination trials for type 1 diabetes prevention. CD8+ T cells recognizing structural and non-structural CVB epitopes provide biomarkers to differentially follow response to infection and vaccination.
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Affiliation(s)
- Federica Vecchio
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Alexia Carré
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Daniil Korenkov
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Zhicheng Zhou
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Paola Apaolaza
- Institute of Diabetes Research, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich-Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Soile Tuomela
- Center for Infectious Medicine, Department of medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | | | - Isaac Snowhite
- Diabetes Research Institute, Leonard Miller School of Medicine, University of Miami, FL, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | | | - Barbara Brandao
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | - Georgia Afonso
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
| | | | - John Kaddis
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
- Department of Diabetes and Cancer Discovery Science, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Sally C. Kent
- University of Massachusetts Medical Chan School, Diabetes Center of Excellence, Department of Medicine, Worcester, MA, USA
| | - Maki Nakayama
- Barbara Davis Center for Diabetes, University of Colorado School of Medicine, Aurora, CO, USA
| | - Sarah J. Richardson
- Islet Biology Exeter (IBEx), Exeter Centre of Excellence for Diabetes Research (EXCEED), Department of Clinical and Biomedical Sciences, University of Exeter Medical School, Exeter, UK
| | - Joelle Vinh
- ESPCI Paris, PSL University, Spectrométrie de Masse Biologique et Protéomique, CNRS UMR8249, Paris, France
| | - Yann Verdier
- ESPCI Paris, PSL University, Spectrométrie de Masse Biologique et Protéomique, CNRS UMR8249, Paris, France
| | - Jutta Laiho
- Tampere University, Faculty of Medicine and Health Technology and Fimlab Laboratories, Tampere, Finland
| | | | - Michele Solimena
- Paul Langerhans Institute, Technical University Dresden, Germany
| | | | - Elise Bismuth
- Assistance Publique Hôpitaux de Paris, Service d’Endocrinologie Pédiatrique, Robert Debré Hospital, Paris, France
| | - Nadine Lucidarme
- Assistance Publique Hôpitaux de Paris, Service de Pédiatrie, Jean Verdier Hospital, Bondy, France
| | - Janine Sanchez
- Department of Pediatrics, Division of pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, FL, USA
| | - Carmen Bustamante
- Department of Pediatrics, Division of pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, FL, USA
| | - Patricia Gomez
- Department of Pediatrics, Division of pediatric Endocrinology, Leonard Miller School of Medicine, University of Miami, FL, USA
| | - Soren Buus
- Panum Institute, Department of International Health, Immunology and Microbiology, Copenhagen, Denmark
| | | | - Sylvaine You
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
- Indiana Biosciences Research Institute, Indianapolis, IN, USA
| | - Alberto Pugliese
- Diabetes Research Institute, Leonard Miller School of Medicine, University of Miami, FL, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Heikki Hyoty
- Tampere University, Faculty of Medicine and Health Technology and Fimlab Laboratories, Tampere, Finland
| | - Teresa Rodriguez-Calvo
- Institute of Diabetes Research, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich-Neuherberg, Germany
- German Center for Diabetes Research (DZD), Neuherberg, Germany
| | - Malin Flodstrom-Tullberg
- Center for Infectious Medicine, Department of medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Roberto Mallone
- Université Paris Cité, Institut Cochin, CNRS, INSERM, Paris, France
- Indiana Biosciences Research Institute, Indianapolis, IN, USA
- Assistance Publique Hôpitaux de Paris, Service de Diabétologie et Immunologie Clinique, Cochin Hospital, Paris, France
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3
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Honkimaa A, Kimura B, Sioofy-Khojine AB, Lin J, Laiho J, Oikarinen S, Hyöty H. Genetic Adaptation of Coxsackievirus B1 during Persistent Infection in Pancreatic Cells. Microorganisms 2020; 8:microorganisms8111790. [PMID: 33203081 PMCID: PMC7697981 DOI: 10.3390/microorganisms8111790] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/10/2020] [Accepted: 11/11/2020] [Indexed: 12/16/2022] Open
Abstract
Coxsackie B (CVB) viruses have been associated with type 1 diabetes. We have recently observed that CVB1 was linked to the initiation of the autoimmune process leading to type 1 diabetes in Finnish children. Viral persistency in the pancreas is currently considered as one possible mechanism. In the current study persistent infection was established in pancreatic ductal and beta cell lines (PANC-1 and 1.1B4) using four different CVB1 strains, including the prototype strain and three clinical isolates. We sequenced 5′ untranslated region (UTR) and regions coding for structural and non-structural proteins and the second single open reading frame (ORF) protein of all persisting CVB1 strains using next generation sequencing to identify mutations that are common for all of these strains. One mutation, K257R in VP1, was found from all persisting CVB1 strains. The mutations were mainly accumulated in viral structural proteins, especially at BC, DE, EF loops and C-terminus of viral capsid protein 1 (VP1), the puff region of VP2, the knob region of VP3 and infection-enhancing epitope of VP4. This showed that the capsid region of the viruses sustains various changes during persistency some of which could be hallmark(s) of persistency.
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Affiliation(s)
- Anni Honkimaa
- Faculty of Medicine and Health Technology, Tampere University, 33520 Tampere, Finland; (B.K.); (A.B.S.-K.); (J.L.); (S.O.); (H.H.)
- Correspondence:
| | - Bryn Kimura
- Faculty of Medicine and Health Technology, Tampere University, 33520 Tampere, Finland; (B.K.); (A.B.S.-K.); (J.L.); (S.O.); (H.H.)
| | - Amir-Babak Sioofy-Khojine
- Faculty of Medicine and Health Technology, Tampere University, 33520 Tampere, Finland; (B.K.); (A.B.S.-K.); (J.L.); (S.O.); (H.H.)
| | - Jake Lin
- Finnish Institute of Molecular Medicine (FIMM), University of Helsinki, 00290 Helsinki, Finland;
| | - Jutta Laiho
- Faculty of Medicine and Health Technology, Tampere University, 33520 Tampere, Finland; (B.K.); (A.B.S.-K.); (J.L.); (S.O.); (H.H.)
| | - Sami Oikarinen
- Faculty of Medicine and Health Technology, Tampere University, 33520 Tampere, Finland; (B.K.); (A.B.S.-K.); (J.L.); (S.O.); (H.H.)
| | - Heikki Hyöty
- Faculty of Medicine and Health Technology, Tampere University, 33520 Tampere, Finland; (B.K.); (A.B.S.-K.); (J.L.); (S.O.); (H.H.)
- Fimlab Laboratories, Pirkanmaa Hospital District, 33520 Tampere, Finland
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4
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Chakraborty B, Davies CTH, DeTar C, El-Khadra AX, Gámiz E, Gottlieb S, Hatton D, Koponen J, Kronfeld AS, Laiho J, Lepage GP, Liu Y, Mackenzie PB, McNeile C, Neil ET, Simone JN, Sugar R, Toussaint D, Van de Water RS, Vaquero A. Strong-Isospin-Breaking Correction to the Muon Anomalous Magnetic Moment from Lattice QCD at the Physical Point. Phys Rev Lett 2018; 120:152001. [PMID: 29756848 DOI: 10.1103/physrevlett.120.152001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 03/03/2018] [Indexed: 06/08/2023]
Abstract
All lattice-QCD calculations of the hadronic-vacuum-polarization contribution to the muon's anomalous magnetic moment to date have been performed with degenerate up- and down-quark masses. Here we calculate directly the strong-isospin-breaking correction to a_{μ}^{HVP} for the first time with physical values of m_{u} and m_{d} and dynamical u, d, s, and c quarks, thereby removing this important source of systematic uncertainty. We obtain a relative shift to be applied to lattice-QCD results obtained with degenerate light-quark masses of δa_{μ}^{HVP,m_{u}≠m_{d}}=+1.5(7)%, in agreement with estimates from phenomenology.
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Affiliation(s)
- B Chakraborty
- Jefferson Lab, 12000 Jefferson Avenue, Newport News, Virginia 23606, USA
| | - C T H Davies
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
| | - C DeTar
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - A X El-Khadra
- Department of Physics, University of Illinois, Urbana, Illinois 61801, USA
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E Gámiz
- CAFPE and Departamento de Física Teórica y del Cosmos, Universidad de Granada, 18071 Granada, Spain
| | - Steven Gottlieb
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - D Hatton
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
| | - J Koponen
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma RM, Italy
| | - A S Kronfeld
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany
| | - J Laiho
- Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - G P Lepage
- Laboratory for Elementary-Particle Physics, Cornell University, Ithaca, New York 14853, USA
| | - Yuzhi Liu
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - P B Mackenzie
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - C McNeile
- Centre for Mathematical Sciences, Plymouth University, Plymouth PL4 8AA, United Kingdom
| | - E T Neil
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J N Simone
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Sugar
- Department of Physics, University of California, Santa Barbara, California 93016, USA
| | - D Toussaint
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - R S Van de Water
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - A Vaquero
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
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5
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Liu Y, Bailey JA, Bazavov A, Bernard C, Bouchard CM, DeTar C, Du D, El-Khadra AX, Freeland ED, Gámiz E, Gelzer Z, Gottlieb S, Heller UM, Kronfeld AS, Laiho J, Mackenzie PB, Meurice Y, Neil ET, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. Bs → Kℓv form factors with 2+1 flavors. EPJ Web Conf 2018. [DOI: 10.1051/epjconf/201817513008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using the MILC 2+1 flavor asqtad quark action ensembles, we are calculating the form factors f0 and f+ for the semileptonic Bs → Kℓv decay. A total of six ensembles with lattice spacing from ≈ 0.12 to 0.06 fm are being used. At the coarsest and finest lattice spacings, the light quark mass m’l is one-tenth the strange quark mass m’s. At the intermediate lattice spacing, the ratio m’l/m’s ranges from 0.05 to 0.2. The valence b quark is treated using the Sheikholeslami-Wohlert Wilson-clover action with the Fermilab interpretation. The other valence quarks use the asqtad action. When combined with (future) measurements from the LHCb and Belle II experiments, these calculations will provide an alternate determination of the CKM matrix element |Vub|.
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6
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Bailey JA, Bazavov A, Bernard C, Bouchard CM, DeTar C, Du D, El-Khadra AX, Freeland ED, Gámiz E, Gottlieb S, Heller UM, Kronfeld AS, Laiho J, Levkova L, Liu Y, Lunghi E, Mackenzie PB, Meurice Y, Neil E, Qiu SW, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. B→πll Form Factors for New Physics Searches from Lattice QCD. Phys Rev Lett 2015; 115:152002. [PMID: 26550717 DOI: 10.1103/physrevlett.115.152002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Indexed: 06/05/2023]
Abstract
The rare decay B→πℓ^{+}ℓ^{-} arises from b→d flavor-changing neutral currents and could be sensitive to physics beyond the standard model. Here, we present the first ab initio QCD calculation of the B→π tensor form factor f_{T}. Together with the vector and scalar form factors f_{+} and f_{0} from our companion work [J. A. Bailey et al., Phys. Rev. D 92, 014024 (2015)], these parametrize the hadronic contribution to B→π semileptonic decays in any extension of the standard model. We obtain the total branching ratio BR(B^{+}→π^{+}μ^{+}μ^{-})=20.4(2.1)×10^{-9} in the standard model, which is the most precise theoretical determination to date, and agrees with the recent measurement from the LHCb experiment [R. Aaij et al., J. High Energy Phys. 12 (2012) 125].
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Affiliation(s)
- Jon A Bailey
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - A Bazavov
- Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
| | - C Bernard
- Department of Physics, Washington University, St. Louis, Missouri 63130, USA
| | - C M Bouchard
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - C DeTar
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - Daping Du
- Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - A X El-Khadra
- Department of Physics, University of Illinois, Urbana, Illinois 61801, USA
| | - E D Freeland
- Liberal Arts Department, School of the Art Institute of Chicago, Chicago, Illinois 60603, USA
| | - E Gámiz
- CAFPE and Departamento de Fisica Teórica y del Cosmos, Universidad de Granada, E-18002 Granada, Spain
| | - Steven Gottlieb
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - U M Heller
- American Physical Society, Ridge, New York 11961, USA
| | - A S Kronfeld
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
- Institute for Advanced Study, Technische Universität München, 85748 Garching, Germany
| | - J Laiho
- Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - L Levkova
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - Yuzhi Liu
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
| | - E Lunghi
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - P B Mackenzie
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - Y Meurice
- Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA
| | - E Neil
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Si-Wei Qiu
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - J N Simone
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Sugar
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | - D Toussaint
- Physics Department, University of Arizona, Tucson, Arizona 85721, USA
| | - R S Van de Water
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - Ran Zhou
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
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7
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Basak S, Bazavov A, Bernard C, DeTar C, Freeland E, Foley J, Gottlieb S, Heller UM, Komijani J, Laiho J, Levkova L, Li R, Osborn J, Sugar RL, Torok A, Toussaint D, Van de Water RS, Zhou R. Electromagnetic effects on the light hadron spectrum. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/1742-6596/640/1/012052] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Aoki S, Aoki Y, Bernard C, Blum T, Colangelo G, Della Morte M, Dürr S, El-Khadra AX, Fukaya H, Horsley R, Jüttner A, Kaneko T, Laiho J, Lellouch L, Leutwyler H, Lubicz V, Lunghi E, Necco S, Onogi T, Pena C, Sachrajda CT, Sharpe SR, Simula S, Sommer R, Van de Water RS, Vladikas A, Wenger U, Wittig H. Review of lattice results concerning low-energy particle physics. Eur Phys J C Part Fields 2014; 74:2890. [PMID: 25972762 PMCID: PMC4410391 DOI: 10.1140/epjc/s10052-014-2890-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Accepted: 05/05/2014] [Indexed: 05/28/2023]
Abstract
We review lattice results related to pion, kaon, [Formula: see text]- and [Formula: see text]-meson physics with the aim of making them easily accessible to the particle-physics community. More specifically, we report on the determination of the light-quark masses, the form factor [Formula: see text], arising in semileptonic [Formula: see text] transition at zero momentum transfer, as well as the decay-constant ratio [Formula: see text] of decay constants and its consequences for the CKM matrix elements [Formula: see text] and [Formula: see text]. Furthermore, we describe the results obtained on the lattice for some of the low-energy constants of [Formula: see text] and [Formula: see text] Chiral Perturbation Theory and review the determination of the [Formula: see text] parameter of neutral kaon mixing. The inclusion of heavy-quark quantities significantly expands the FLAG scope with respect to the previous review. Therefore, we focus here on [Formula: see text]- and [Formula: see text]-meson decay constants, form factors, and mixing parameters, since these are most relevant for the determination of CKM matrix elements and the global CKM unitarity-triangle fit. In addition we review the status of lattice determinations of the strong coupling constant [Formula: see text].
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Affiliation(s)
| | - S. Aoki
- Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto, 606-8502 Japan
| | - Y. Aoki
- Kobayashi-Maskawa Institute for the Origin of Particles and the Universe (KMI), Nagoya University, Nagoya, 464-8602 Japan
- RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973 USA
| | - C. Bernard
- Department of Physics, Washington University, Saint Louis, MO 63130 USA
| | - T. Blum
- RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973 USA
- Physics Department, University of Connecticut, Storrs, CT 06269-3046 USA
| | - G. Colangelo
- Albert Einstein Center for Fundamental Physics, Institut für theoretische Physik, Universität Bern, Sidlerstr. 5, 3012 Bern, Switzerland
| | - M. Della Morte
- CP3-Origins & Danish IAS, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark
- IFIC (CSIC), c/ Catedrático José Beltrán, 2, 46980 Paterna, Spain
| | - S. Dürr
- Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany
- Jülich Supercomputing Center, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - A. X. El-Khadra
- Department of Physics, University of Illinois, Urbana, IL 61801 USA
| | - H. Fukaya
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043 Japan
| | - R. Horsley
- School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ UK
| | - A. Jüttner
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ UK
| | - T. Kaneko
- High Energy Accelerator Research Organization (KEK), Ibaraki, 305-0801 Japan
| | - J. Laiho
- SUPA, Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ UK
- Present Address: Department of Physics, Syracuse University, Syracuse, New York USA
| | - L. Lellouch
- Aix-Marseille Université, CNRS, CPT, UMR 7332, 13288 Marseille, France
- Université de Toulon, CNRS, CPT, UMR 7332, 83957 La Garde, France
| | - H. Leutwyler
- Albert Einstein Center for Fundamental Physics, Institut für theoretische Physik, Universität Bern, Sidlerstr. 5, 3012 Bern, Switzerland
| | - V. Lubicz
- Dipartimento di Matematica e Fisica, Università Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy
- INFN, Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy
| | - E. Lunghi
- Physics Department, Indiana University, Bloomington, IN 47405 USA
| | - S. Necco
- Albert Einstein Center for Fundamental Physics, Institut für theoretische Physik, Universität Bern, Sidlerstr. 5, 3012 Bern, Switzerland
| | - T. Onogi
- Department of Physics, Osaka University, Toyonaka, Osaka, 560-0043 Japan
| | - C. Pena
- Instituto de Física Teórica UAM/CSIC and Departamento de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - C. T. Sachrajda
- School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ UK
| | - S. R. Sharpe
- Physics Department, University of Washington, Seattle, WA 98195-1560 USA
| | - S. Simula
- INFN, Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy
| | - R. Sommer
- NIC @ DESY, Platanenallee 6, 15738 Zeuthen, Germany
| | | | - A. Vladikas
- INFN, Sezione di Tor Vergata, c/o Dipartimento di Fisica, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - U. Wenger
- Albert Einstein Center for Fundamental Physics, Institut für theoretische Physik, Universität Bern, Sidlerstr. 5, 3012 Bern, Switzerland
| | - H. Wittig
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institute Mainz, University of Mainz, 55099 Mainz, Germany
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9
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Bazavov A, Bernard C, Bouchard CM, Detar C, Du D, El-Khadra AX, Foley J, Freeland ED, Gámiz E, Gottlieb S, Heller UM, Kim J, Kronfeld AS, Laiho J, Levkova L, Mackenzie PB, Neil ET, Oktay MB, Qiu SW, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. Determination of |V(us)|| from a lattice QCD calculation of the K → πℓν semileptonic form factor with physical quark masses. Phys Rev Lett 2014; 112:112001. [PMID: 24702353 DOI: 10.1103/physrevlett.112.112001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Indexed: 06/03/2023]
Abstract
We calculate the kaon semileptonic form factor f+(0) from lattice QCD, working, for the first time, at the physical light-quark masses. We use gauge configurations generated by the MILC Collaboration with Nf = 2 + 1 + 1 flavors of sea quarks, which incorporate the effects of dynamical charm quarks as well as those of up, down, and strange. We employ data at three lattice spacings to extrapolate to the continuum limit. Our result, f+(0) = 0.9704(32), where the error is the total statistical plus systematic uncertainty added in quadrature, is the most precise determination to date. Combining our result with the latest experimental measurements of K semileptonic decays, one obtains the Cabibbo-Kobayashi-Maskawa matrix element |V(us)| = 0.22290(74)(52), where the first error is from f+(0) and the second one is from experiment. In the first-row test of Cabibbo-Kobayashi-Maskawa unitarity, the error stemming from |V(us)| is now comparable to that from |V(ud)|.
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Affiliation(s)
- A Bazavov
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA and Department of Physics and Astronomy, University of Iowa, Iowa 52242, USA
| | - C Bernard
- Department of Physics, Washington University, St. Louis, Missouri 63130, USA
| | - C M Bouchard
- Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA
| | - C Detar
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - Daping Du
- Physics Department, University of Illinois, Urbana, Illinois 61801, USA
| | - A X El-Khadra
- Physics Department, University of Illinois, Urbana, Illinois 61801, USA and Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - J Foley
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - E D Freeland
- Liberal Arts Department, School of the Art Institute of Chicago, Chicago, Illinois 60603, USA
| | - E Gámiz
- CAFPE and Departamento de Física Teórica y del Cosmos, Universidad de Granada, E-18071 Granada, Spain
| | - Steven Gottlieb
- Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
| | - U M Heller
- American Physical Society, Ridge, New York 11961, USA
| | - Jongjeong Kim
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - A S Kronfeld
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - J Laiho
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom and Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| | - L Levkova
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - P B Mackenzie
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - E T Neil
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA and RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M B Oktay
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - Si-Wei Qiu
- Physics Department, University of Utah, Salt Lake City, Utah 84112, USA
| | - J N Simone
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - R Sugar
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | - D Toussaint
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
| | - R S Van de Water
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
| | - Ran Zhou
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA and Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
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10
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Bazavov A, Bernard C, DeTar C, Foley J, Freeman W, Gottlieb S, Heller UM, Hetrick JE, Kim J, Laiho J, Levkova L, Lightman M, Osborn J, Qiu S, Sugar RL, Toussaint D, Van de Water RS, Zhou R. Leptonic-decay-constant ratio f(K+)/f(π+) from lattice QCD with physical light quarks. Phys Rev Lett 2013; 110:172003. [PMID: 23679710 DOI: 10.1103/physrevlett.110.172003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Indexed: 06/02/2023]
Abstract
A calculation of the ratio of leptonic decay constants f(K+)/f(π+) makes possible a precise determination of the ratio of Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |V(us)|/|V(ud)| in the standard model, and places a stringent constraint on the scale of new physics that would lead to deviations from unitarity in the first row of the CKM matrix. We compute f(K+)/f(π+) numerically in unquenched lattice QCD using gauge-field ensembles recently generated that include four flavors of dynamical quarks: up, down, strange, and charm. We analyze data at four lattice spacings a ≈ 0.06, 0.09, 0.12, and 0.15 fm with simulated pion masses down to the physical value 135 MeV. We obtain f(K+)/f(π+) = 1.1947(26)(37), where the errors are statistical and total systematic, respectively. This is our first physics result from our N(f) = 2+1+1 ensembles, and the first calculation of f(K+)/f(π+) from lattice-QCD simulations at the physical point. Our result is the most precise lattice-QCD determination of f(K+)/f(π+), with an error comparable to the current world average. When combined with experimental measurements of the leptonic branching fractions, it leads to a precise determination of |V(us)|/|V(ud)| = 0.2309(9)(4) where the errors are theoretical and experimental, respectively.
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Affiliation(s)
- A Bazavov
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
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11
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Bailey JA, Bazavov A, Bernard C, Bouchard CM, Detar C, Du D, El-Khadra AX, Foley J, Freeland ED, Gámiz E, Gottlieb S, Heller UM, Kim J, Kronfeld AS, Laiho J, Levkova L, Mackenzie PB, Meurice Y, Neil ET, Oktay MB, Qiu SW, Simone JN, Sugar R, Toussaint D, Van de Water RS, Zhou R. Refining new-physics searches in B→Dτν with lattice QCD. Phys Rev Lett 2012; 109:071802. [PMID: 23006357 DOI: 10.1103/physrevlett.109.071802] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Indexed: 06/01/2023]
Abstract
The semileptonic decay channel B→Dτν is sensitive to the presence of a scalar current, such as that mediated by a charged-Higgs boson. Recently, the BABAR experiment reported the first observation of the exclusive semileptonic decay B→Dτ(-)ν, finding an approximately 2σ disagreement with the standard-model prediction for the ratio R(D)=BR(B→Dτν)/BR(B→Dℓν), where ℓ = e,μ. We compute this ratio of branching fractions using hadronic form factors computed in unquenched lattice QCD and obtain R(D)=0.316(12)(7), where the errors are statistical and total systematic, respectively. This result is the first standard-model calculation of R(D) from ab initio full QCD. Its error is smaller than that of previous estimates, primarily due to the reduced uncertainty in the scalar form factor f(0)(q(2)). Our determination of R(D) is approximately 1σ higher than previous estimates and, thus, reduces the tension with experiment. We also compute R(D) in models with electrically charged scalar exchange, such as the type-II two-Higgs-doublet model. Once again, our result is consistent with, but approximately 1σ higher than, previous estimates for phenomenologically relevant values of the scalar coupling in the type-II model. As a by-product of our calculation, we also present the standard-model prediction for the longitudinal-polarization ratio P(L)(D)=0.325(4)(3).
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Affiliation(s)
- Jon A Bailey
- Department of Physics and Astronomy, Seoul National University, South Korea
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12
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Abstract
We calculate the spectral dimension for nonperturbative quantum gravity defined via Euclidean dynamical triangulations. We find that it runs from a value of ∼3/2 at short distance to ∼4 at large distance scales, similar to results from causal dynamical triangulations. We argue that the short-distance value of 3/2 for the spectral dimension may resolve the tension between asymptotic safety and the holographic principle.
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Affiliation(s)
- J Laiho
- SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
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13
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Koskela J, Laiho J, KäHönen M, Rontu R, Lehtinen R, Viik J, Niemi M, Niemelä K, Kööbi T, Turjanmaa V, Pörsti I, Lehtimäki T, Nieminen T. Potassium channel KCNH2 K897T polymorphism and cardiac repolarization during exercise test: The Finnish Cardiovascular Study. Scand J Clin Lab Invest 2008; 68:31-8. [PMID: 17852802 DOI: 10.1080/00365510701496488] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Cardiac repolarization is regulated, in part, by the KCNH2 gene, which encodes a rapidly activating component of the delayed rectifier potassium channel. The gene expresses a functional single nucleotide polymorphism, K897T, which changes the biophysical properties of the channel. The objective of this study was to evaluate whether this polymorphism influences two indices of repolarization--the QT interval and T-wave alternans (TWA)--during different phases of a physical exercise test. MATERIAL AND METHODS The cohort consisted of 1,975 patients undergoing an exercise test during which on-line electrocardiographic data were registered. Information on coronary risk factors and medication was recorded. The 2690A>C nucleotide variation in the KCNH2 gene corresponding to the K897T amino acid change was analysed after polymerase chain reaction with allele-specific TaqMan probes. RESULTS Among all subjects, the QTc intervals did not differ between the three genotype groups (p> or =0.31, RANOVA). Women with the CC genotype tended to have longer QT intervals during the exercise test, but the difference was statistically significant only at rest (p = 0.011, ANOVA). This difference was also detected when the analysis was adjusted for several factors influencing the QT interval. No statistically significant effects of the K897T polymorphism on TWA were observed among all subjects (p = 0.16, RANOVA), nor in men and women separately. CONCLUSIONS The K897T polymorphism of the KCNH2 gene may not be a major genetic determinant for the TWA, but the influence of the CC genotype on QT interval deserves further research among women.
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Affiliation(s)
- J Koskela
- Internal Medicine, Tampere University Hospital and Tampere University Medical School, Tampere, Finland.
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14
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Abstract
The aim of this study was to derive new spirometric reference equations for the English population, using the 1995/1996 Health Survey for England, a large nationally representative cross-sectional study. The measurements used were the forced expiratory volume in one second (FEV1) and forced vital capacity (FVC) of a sample of 6,053 "healthy" (nonsmokers with no reported diagnosis of asthma or respiratory symptoms) White people aged > or = 16 yrs. Multiple regression analysis, with age and height as predictors, was carried out to estimate prediction equations for mean FEV1, FVC and FEV1/FVC, separately for males and females. A method based on smoothing multiple estimates of the fifth percentiles of residuals was used to derive prediction equations for the lower limit of normal lung function. The new equations fit the current English adult population considerably better than the European Coal and Steel Community equations, and the proportions of people with "low" (below the fifth percentile) lung function are closer to those expected throughout the whole adult age range (16 to > 75 yrs). For the age ranges the studies share in common, the new equations give estimates close to those derived from other nonlinear equations in recent studies. It is, therefore, suggested that these newly developed prediction equations be used for the White English population in both epidemiological studies and clinical practice.
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Affiliation(s)
- E Falaschetti
- Dept of Epidemiology and Public Health, Royal Free and University College Medical School, London, UK.
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15
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Törmälä P, Vasenius J, Vainionpää S, Laiho J, Pohjonen T, Rokkanen P. Ultra-high-strength absorbable self-reinforced polyglycolide (SR-PGA) composite rods for internal fixation of bone fractures: in vitro and in vivo study. J Biomed Mater Res 1991; 25:1-22. [PMID: 1850429 DOI: 10.1002/jbm.820250102] [Citation(s) in RCA: 161] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The ultra-high-strength, self-reinforced (SR) absorbable polymeric composites, consisting of reinforcement elements, like fibers, and of matrix polymer which have the same chemical element composition as reinforcement, were defined. A method to manufacture self-reinforced, absorbable polyglycolide (SR-PGA) rods of polyglycolide sutures (Dexon) by sintering them partially together at elevated temperature and pressure was presented. The rods with nominal diameters of 1.5 mm, 2.0 mm, 3.2 mm, and 4.5 mm showed initial bending modulus and strength values of 8-15 GPa and 220-405 MPa, respectively. Their initial shear strengths were 165-255 MPa. The smallest rods (diam. 1.5 mm) lost their mechanical strength after implantation in the subcutis of rabbits in 4-5 weeks while the thickest rods retained their strength over 8 weeks. The ultra-high-strength SR-PGA rods were concluded to be suitable for fixation of cancellous bone fractures, osteotomies, and epiphyseal plate fractures where the fixation is not exposed to excessive mechanical stresses and where the loads are predominantly of a shear nature.
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Affiliation(s)
- P Törmälä
- Biomaterials Laboratory, Tampere University of Technology, Finland
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16
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Mäkelä EA, Vainionpää S, Vihtonen K, Mero M, Laiho J, Törmälä P, Rokkanen P. Healing of physeal fracture after fixation with biodegradable self-reinforced polyglycolic acid pins. An experimental study on growing rabbits. Clin Mater 1989; 5:1-12. [PMID: 10149949 DOI: 10.1016/0267-6605(90)90067-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Physeal fractures occur at a frequency of 15% of all long bone fractures in children. Undisturbed continued bone growth is the main goal of the treatment of these fractures. After the operative reduction and fixation, whenever needed, a second operation for the removal of the pins is inevitable. The purpose of this study was to develop a biodegradable fixation device for transphyseal fracture fixation, abolishing the need of removal operation. Epiphyseal separation of the distal femoral physis was made on the right side in 18 five-week-old rabbits. The fixation of the physeal fracture was made with two self-reinforced polyglycolic acid (SR-PGA) pins 1mm in nominal diameter and 25mm in length. The follow-up times were 3, 6, 12, 24, and 28 weeks. The distal femoral growth-plate of both femurs was analyzed by radiographic, microradiographic, oxytetracycline-fluorescence, histological and histomorphometric studies. Histomorphometric studies showed normal features of growth. Two growth-plate-penetrating transcondylar SR-PGA implants, of 1mm in diameter, provided sufficient stability for the fixation of a distal femoral physeal fracture in a growing rabbit, and did not cause any growth disturbance.
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Affiliation(s)
- E A Mäkelä
- Department of Orthopaedics and Traumatology, Helsinki University Central Hospital, Finland
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17
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Mäkelä EA, Vainionpää S, Vihtonen K, Mero M, Laiho J, Törmälä P, Rokkanen P. The effect of a penetrating biodegradable implant on the epiphyseal plate: an experimental study on growing rabbits with special regard to polyglactin 910. J Pediatr Orthop 1987; 7:415-20. [PMID: 3611337 DOI: 10.1097/01241398-198707000-00007] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A polyglactin 910 rod 3.2 mm in diameter and 25 mm in length was driven in a drill hole in the intercondylar portion of the right femur across the central portion of the growth plate in 20 5-week-old rabbits. The follow-up times were 3, 6, 12, and 24 weeks. The distal femoral growth plates of both femurs were analyzed by radiographic, microradiographic, and oxytetracycline fluorescence, histological, and histomorphometric studies. Histomorphometric studies showed clear changes at injury site and appeared to be an excellent means of exact numerical description of the different cellular areas of the growth plate. Six weeks after implantation, a polyglactin 910 implant resulted in a growth disturbance similar to that of a drill hole of equal bore.
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18
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Vainionpää S, Kilpikari J, Laiho J, Helevirta P, Rokkanen P, Törmälä P. Strength and strength retention in vitro, of absorbable, self-reinforced polyglycolide (PGA) rods for fracture fixation. Biomaterials 1987; 8:46-8. [PMID: 3828445 DOI: 10.1016/0142-9612(87)90028-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The initial shear strength and changes in flexural strength of self-reinforced, absorbable polyglycolide (PGA) composite rods, submerged in distilled water (at 37 degrees C) for a period of 6 wk, were investigated. The recently developed self-reinforced absorbable material consists of an absorbable polymeric matrix reinforced with fibres of the same polymer. The initial shear strength of self-reinforced cylindrical PGA rods with a diameter of 3.2 mm was 250 MPa and the initial flexural strength of the rods was 370 MPa. During the first week of immersion the level of flexural strength decreased very little i.e. to 320 MPa. The loss of flexural strength increased after 1 wk immersion. However, after 3 wk it was 90 MPa. After 5 wk the flexural strength decreased to the level of strength of cancellous bone i.e. 10-20 MPa. The gamma-irradiation of the PGA rods (total dosage 2.5 Mrad) decreased the initial bending strength to 300 MPa but the hydrolytic behaviour of the rods was not changed. The in vitro strength and the strength retention of self-reinforced PGA rods are clearly better than the corresponding values for self-reinforced glycolide/lactide copolymer rods which we developed recently. Self-reinforced PGA rods are now used routinely in Helsinki University Central Hospital in the treatment of certain types of cancellous bone fracture.
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19
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Rokkanen P, Böstman O, Vainionpää S, Vihtonen K, Törmälä P, Laiho J, Kilpikari J, Tamminmäki M. Biodegradable implants in fracture fixation: early results of treatment of fractures of the ankle. Lancet 1985; 1:1422-4. [PMID: 2861365 DOI: 10.1016/s0140-6736(85)91847-1] [Citation(s) in RCA: 222] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Biodegradable polylactide-glycolide copolymer implants for fracture fixation were developed and tested in rabbits. In a prospective clinical study 44 patients with a displaced fracture of the ankle were randomly allocated to two groups; one was treated with conventional metallic implants and the other with the biodegradable implants. There were no differences between the two groups in the early results, but the biodegradable fixation method is advantageous because the removal procedure associated with metallic implants is avoided.
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