1
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From Five-Loop Scattering Amplitudes to Open Trees with the Loop-Tree Duality. Symmetry (Basel) 2022. [DOI: 10.3390/sym14122571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/09/2022] Open
Abstract
Characterizing multiloop topologies is an important step towards developing novel methods at high perturbative orders in quantum field theory. In this article, we exploit the Loop-Tree Duality (LTD) formalism to analyse multiloop topologies that appear for the first time at five loops. Explicitly, we open the loops into connected trees and group them according to their topological properties. Then, we identify a kernel generator, the so-called N7MLT universal topology, that allows us to describe any scattering amplitude of up to five loops. Furthermore, we provide factorization and recursion relations that enable us to write these multiloop topologies in terms of simpler subtopologies, including several subsets of Feynman diagrams with an arbitrary number of loops. Our approach takes advantage of many symmetries present in the graphical description of the original fundamental five-loop topologies. The results obtained in this article might shed light into a more efficient determination of higher-order corrections to the running couplings, which are crucial in the current and future precision physics program.
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2
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Liu ZL, Schalch N. Infrared Singularities of Multileg QCD Amplitudes with a Massive Parton at Three Loops. PHYSICAL REVIEW LETTERS 2022; 129:232001. [PMID: 36563215 DOI: 10.1103/physrevlett.129.232001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 09/30/2022] [Accepted: 11/04/2022] [Indexed: 06/17/2023]
Abstract
We derive the structure of three-loop anomalous dimensions governing infrared singularities of QCD amplitudes with one massive and an arbitrary number of massless external partons. The contributions of tripole and quadrupole correlations involving a massive parton are studied in detail. The analytical expression of tripole correlations between one massive and two massless partons is obtained at three loops for the first time. We regularize the infrared divergences in the soft matrix element in a novel approach, where no extra scale dependence is involved, and the calculation can be performed in momentum space. Our results are essential to improve the theoretical predictions of single top and top quark pair productions at hadron colliders.
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Affiliation(s)
- Ze Long Liu
- Institut für Theoretische Physik and AEC, Universität Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
| | - Nicolas Schalch
- Institut für Theoretische Physik and AEC, Universität Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
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3
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Caola F, Chakraborty A, Gambuti G, von Manteuffel A, Tancredi L. Three-Loop Gluon Scattering in QCD and the Gluon Regge Trajectory. PHYSICAL REVIEW LETTERS 2022; 128:212001. [PMID: 35687450 DOI: 10.1103/physrevlett.128.212001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
We compute the three-loop helicity amplitudes for the scattering of four gluons in QCD. We employ projectors in the 't Hooft-Veltman scheme and construct the amplitudes from a minimal set of physical building blocks, which allows us to keep the computational complexity under control. We obtain relatively compact results that can be expressed in terms of harmonic polylogarithms. In addition, we consider the Regge limit of our amplitude and extract the gluon Regge trajectory in full three-loop QCD. This is the last missing ingredient required for studying single-Reggeon exchanges at next-to-next-to-leading logarithmic accuracy.
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Affiliation(s)
- Fabrizio Caola
- Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
- Wadham College, University of Oxford, Parks Road, Oxford OX1 3PN, United Kingdom
| | - Amlan Chakraborty
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Giulio Gambuti
- Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
- New College, University of Oxford, Holywell Street, Oxford OX1 3BN, United Kingdom
| | - Andreas von Manteuffel
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Lorenzo Tancredi
- Physik Department, James-Franck-Straße 1, Technische Universität München, D-85748 Garching, Germany
- Exzellenzcluster ORIGINS, Boltzmannstraße 2, D-85748 Garching, Germany
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4
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Bonciani R, Broggio A, Di Vita S, Ferroglia A, Mandal MK, Mastrolia P, Mattiazzi L, Primo A, Ronca J, Schubert U, Torres Bobadilla WJ, Tramontano F. Two-Loop Four-Fermion Scattering Amplitude in QED. PHYSICAL REVIEW LETTERS 2022; 128:022002. [PMID: 35089776 DOI: 10.1103/physrevlett.128.022002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 11/20/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
We present the first fully analytic evaluation of the transition amplitude for the scattering of a massless into a massive pair of fermions at the two-loop level in quantum electrodynamics. Our result is an essential ingredient for the determination of the electromagnetic coupling within scattering reactions, beyond the currently known accuracy, which has a crucial impact on the evaluation of the anomalous magnetic moment of the muon. It will allow, in particular, for a precise determination of the leading hadronic contribution to the (g-2)_{μ} in the MUonE experiment at CERN, and therefore can be used to shed light on the current discrepancy between the standard model prediction and the experimental measurement for this important physical observable.
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Affiliation(s)
- R Bonciani
- Dipartimento di Fisica, Università di Roma "La Sapienza" and INFN Sezione di Roma, 00185 Roma, Italy
| | - A Broggio
- Università degli Studi di Milano-Bicocca and INFN Sezione di Milano-Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
| | - S Di Vita
- INFN, Sezione di Milano, Via Celoria 16, 20133 Milano, Italy
- Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
| | - A Ferroglia
- Physics Department, New York City College of Technology, The City University of New York, 300 Jay Street, Brooklyn, New York 11201, USA
- The Graduate School and University Center, The City University of New York, 365 Fifth Avenue, New York, New York 10016, USA
| | - M K Mandal
- INFN, Sezione di Padova, Via Marzolo 8, 35131 Padova, Italy
- Dipartimento di Fisica e Astronomia, Università di Padova, Via Marzolo 8, 35131 Padova, Italy
| | - P Mastrolia
- INFN, Sezione di Padova, Via Marzolo 8, 35131 Padova, Italy
- Dipartimento di Fisica e Astronomia, Università di Padova, Via Marzolo 8, 35131 Padova, Italy
| | - L Mattiazzi
- INFN, Sezione di Padova, Via Marzolo 8, 35131 Padova, Italy
- Dipartimento di Fisica e Astronomia, Università di Padova, Via Marzolo 8, 35131 Padova, Italy
| | - A Primo
- Department of Physics, University of Zürich, CH-8057 Zürich, Switzerland
| | - J Ronca
- Dipartimento di Fisica, Università di Napoli Federico II and INFN, Sezione di Napoli, I-80126 Napoli, Italy
| | - U Schubert
- Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
| | - W J Torres Bobadilla
- Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, 80805 München, Germany
| | - F Tramontano
- Dipartimento di Fisica, Università di Napoli Federico II and INFN, Sezione di Napoli, I-80126 Napoli, Italy
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5
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Ahmed T, Ajjath AH, Mukherjee P, Ravindran V, Sankar A. Rapidity distribution at soft-virtual and beyond for n-colorless particles to N 4 LO in QCD. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2021; 81:943. [PMID: 34720712 PMCID: PMC8545737 DOI: 10.1140/epjc/s10052-021-09658-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
We present a systematic framework to study the threshold contributions of the differential rapidity distribution for the production of any number of colorless particles in the hadronic colliders. This has been achieved based on the universality structure of the soft enhancements associated with the real emissions, along with the factorization property of the differential cross section and the renormalization group invariance. In this formalism, we present a universal soft-collinear operator to compute the soft virtual differential cross section for a generic 2 → n scattering process up to next-to-next-to-next-to-next-to-leading order ( N 4 LO) in perturbative QCD. We also provide a universal operator to perform the threshold resummation to next-to-next-to-next-to-leading logarithmic ( N 3 LL) accuracy. We explicitly present the approximate analytical results of the rapidity distributions at N 4 LO and N 3 LL for the Higgs boson production through gluon fusion and bottom quark annihilation, and also for the Drell-Yan production at the hadronic collider. We extend our framework to include the next to threshold contributions for the diagonal partonic channels.
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Affiliation(s)
- Taushif Ahmed
- Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, 80805 Munich, Germany
- Dipartimento di Fisica and Arnold-Regge Center, Università di Torino and INFN, Sezione di Torino, Via Pietro Giuria 1, 10125 Turin, Italy
| | - A. H. Ajjath
- The Institute of Mathematical Sciences, HBNI, IV Cross Road, Taramani, Chennai, 600113 India
| | - Pooja Mukherjee
- The Institute of Mathematical Sciences, HBNI, IV Cross Road, Taramani, Chennai, 600113 India
| | - V. Ravindran
- The Institute of Mathematical Sciences, HBNI, IV Cross Road, Taramani, Chennai, 600113 India
| | - Aparna Sankar
- The Institute of Mathematical Sciences, HBNI, IV Cross Road, Taramani, Chennai, 600113 India
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6
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Badger S, Hartanto HB, Zoia S. Two-Loop QCD Corrections to Wbb[over ¯] Production at Hadron Colliders. PHYSICAL REVIEW LETTERS 2021; 127:012001. [PMID: 34270299 DOI: 10.1103/physrevlett.127.012001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/15/2021] [Accepted: 05/25/2021] [Indexed: 06/13/2023]
Abstract
We present an analytic computation of the two-loop QCD corrections to ud[over ¯]→W^{+}bb[over ¯] for an on-shell W boson using the leading color and massless bottom quark approximations. We perform an integration-by-parts reduction of the unpolarized squared matrix element using finite field reconstruction techniques and identify an independent basis of special functions that allows an analytic subtraction of the infrared and ultraviolet poles. This basis is valid for all planar topologies for five-particle scattering with an off-shell leg.
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Affiliation(s)
- Simon Badger
- Dipartimento di Fisica and Arnold-Regge Center, Università di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, Italy
| | | | - Simone Zoia
- Dipartimento di Fisica and Arnold-Regge Center, Università di Torino and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, Italy
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7
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Abstract
I discuss and review soft anomalous dimensions in QCD that describe soft-gluon threshold resummation for a wide range of hard-scattering processes. The factorization properties of the cross section in moment space and renormalization-group evolution are implemented to derive a general form for differential resummed cross sections. Detailed expressions are given for the soft anomalous dimensions at one, two, and three loops, including some new results, for a large number of partonic processes involving top quarks, electroweak bosons, Higgs bosons, and other particles in the standard model and beyond.
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8
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von Manteuffel A, Panzer E, Schabinger RM. Cusp and Collinear Anomalous Dimensions in Four-Loop QCD from Form Factors. PHYSICAL REVIEW LETTERS 2020; 124:162001. [PMID: 32383907 DOI: 10.1103/physrevlett.124.162001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
We calculate the complete quark and gluon cusp anomalous dimensions in four-loop massless QCD analytically from first principles. In addition, we determine the complete matter dependence of the quark and gluon collinear anomalous dimensions. Our approach is to Laurent expand four-loop quark and gluon form factors in the parameter of dimensional regularization. We employ finite field and syzygy techniques to reduce the relevant Feynman integrals to a basis of finite integrals, and subsequently evaluate the basis integrals directly from their standard parametric representations.
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Affiliation(s)
- Andreas von Manteuffel
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
| | - Erik Panzer
- All Souls College, University of Oxford, OX1 4AL Oxford, United Kingdom
| | - Robert M Schabinger
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
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9
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Bourjaily JL, Herrmann E, Langer C, McLeod AJ, Trnka J. All-Multiplicity Nonplanar Amplitude Integrands in Maximally Supersymmetric Yang-Mills Theory at Two Loops. PHYSICAL REVIEW LETTERS 2020; 124:111603. [PMID: 32242737 DOI: 10.1103/physrevlett.124.111603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 02/28/2020] [Indexed: 06/11/2023]
Abstract
We give a prescriptive representation of all-multiplicity two-loop maximally-helicity-violating (MHV) amplitude integrands in fully-color-dressed (nonplanar) maximally supersymmetric Yang-Mills theory.
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Affiliation(s)
- Jacob L Bourjaily
- Niels Bohr International Academy and Discovery Center, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
- Center for the Fundamental Laws of Nature, Department of Physics, Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts 02138, USA
- Institute for Gravitation and the Cosmos, Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16892, USA
| | - Enrico Herrmann
- SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94039, USA
| | - Cameron Langer
- Center for Quantum Mathematics and Physics (QMAP), Department of Physics, University of California, Davis, California 95616, USA
| | - Andrew J McLeod
- Niels Bohr International Academy and Discovery Center, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
| | - Jaroslav Trnka
- Center for Quantum Mathematics and Physics (QMAP), Department of Physics, University of California, Davis, California 95616, USA
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10
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Davies J, Herren F, Steinhauser M. Top Quark Mass Effects in Higgs Boson Production at Four-Loop Order: Virtual Corrections. PHYSICAL REVIEW LETTERS 2020; 124:112002. [PMID: 32242720 DOI: 10.1103/physrevlett.124.112002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 03/03/2020] [Indexed: 06/11/2023]
Abstract
We compute four-loop corrections to the Higgs boson gluon vertex, including finite top quark mass effects. Analytic results are presented which serve as a building block for the next-to-next-to-next-to-leading order corrections to Higgs boson production at the Large Hadron Collider at CERN.
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Affiliation(s)
- Joshua Davies
- Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
| | - Florian Herren
- Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
| | - Matthias Steinhauser
- Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
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11
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Duhr C, Johansson H, Kälin G, Mogull G, Verbeek B. Full-Color Two-Loop Four-Gluon Amplitude in N=2 Supersymmetric QCD. PHYSICAL REVIEW LETTERS 2019; 123:241601. [PMID: 31922855 DOI: 10.1103/physrevlett.123.241601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Indexed: 06/10/2023]
Abstract
We present the fully integrated form of the two-loop four-gluon amplitude in N=2 supersymmetric quantum chromodynamics with gauge group SU(N_{c}) and with N_{f} massless supersymmetric quarks (hypermultiplets) in the fundamental representation. Our result maintains full dependence on N_{c} and N_{f}, and relies on the existence of a compact integrand representation that exhibits the duality between color and kinematics. Specializing to the N=2 superconformal theory, where N_{f}=2N_{c}, we obtain remarkably simple amplitudes that have an analytic structure close to that of N=4 super-Yang-Mills theory, except that now certain lower-weight terms appear. We comment on the corresponding results for other gauge groups.
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Affiliation(s)
- Claude Duhr
- Theoretical Physics Department, CERN, CH-1211 Geneva 23, Switzerland
- Center for Cosmology, Particle Physics and Phenomenology (CP3), UCLouvain, Chemin du Cyclotron 2, 1348 Louvain-La-Neuve, Belgium
| | - Henrik Johansson
- Department of Physics and Astronomy, Uppsala University, Uppsala, 75108 Sweden
- Nordita, Stockholm University and KTH Royal Institute of Technology, Roslagstullsbacken 23, Stockholm, 10691 Sweden
| | - Gregor Kälin
- Department of Physics and Astronomy, Uppsala University, Uppsala, 75108 Sweden
| | - Gustav Mogull
- Department of Physics and Astronomy, Uppsala University, Uppsala, 75108 Sweden
| | - Bram Verbeek
- Center for Cosmology, Particle Physics and Phenomenology (CP3), UCLouvain, Chemin du Cyclotron 2, 1348 Louvain-La-Neuve, Belgium
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12
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Abreu S, Dormans J, Cordero FF, Ita H, Page B. Analytic Form of Planar Two-Loop Five-Gluon Scattering Amplitudes in QCD. PHYSICAL REVIEW LETTERS 2019; 122:082002. [PMID: 30932613 DOI: 10.1103/physrevlett.122.082002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Indexed: 06/09/2023]
Abstract
We present the analytic form of the planar two-loop five-gluon scattering amplitudes in QCD for a complete set of independent helicity configurations of external gluons. These include the first analytic results for five-point two-loop amplitudes relevant for the computation of next-to-next-to-leading-order QCD corrections at hadron colliders. The results were obtained by reconstructing analytic expressions from numerical evaluations. The complexity of the computation is reduced by exploiting physical and analytical properties of the amplitudes, employing a minimal basis of so-called pentagon functions that have recently been classified.
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Affiliation(s)
- S Abreu
- Center for Cosmology, Particle Physics and Phenomenology (CP3), Université Catholique de Louvain, 1348 Louvain-La-Neuve, Belgium
| | - J Dormans
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany
| | - F Febres Cordero
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany
- Physics Department, Florida State University Tallahassee, Florida 32306, USA
| | - H Ita
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany
| | - B Page
- Institut de Physique Théorique, CEA, CNRS, Université Paris-Saclay, F-91191 Gif-sur-Yvette cedex, France
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13
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Abreu S, Febres Cordero F, Ita H, Page B, Zeng M. Planar two-loop five-gluon amplitudes from numerical unitarity. Int J Clin Exp Med 2018. [DOI: 10.1103/physrevd.97.116014] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Badger S, Brønnum-Hansen C, Hartanto HB, Peraro T. First Look at Two-Loop Five-Gluon Scattering in QCD. PHYSICAL REVIEW LETTERS 2018; 120:092001. [PMID: 29547305 DOI: 10.1103/physrevlett.120.092001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Indexed: 06/08/2023]
Abstract
We compute the leading-color contributions to five-gluon scattering at two loops in massless QCD. The integrands of all independent helicity amplitudes are evaluated using d-dimensional generalized unitarity cuts and finite field reconstruction techniques. Numerical evaluation of the integral basis is performed with sector decomposition methods to obtain the first benchmark results for all helicity configurations of a 2→3 scattering process in QCD.
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Affiliation(s)
- Simon Badger
- Institute for Particle Physics Phenomenology, Department of Physics, Durham University, Durham DH1 3LE, United Kingdom
| | - Christian Brønnum-Hansen
- Higgs Centre for Theoretical Physics, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ, Scotland, United Kingdom
| | - Heribertus Bayu Hartanto
- Institute for Particle Physics Phenomenology, Department of Physics, Durham University, Durham DH1 3LE, United Kingdom
| | - Tiziano Peraro
- PRISMA Cluster of Excellence, Johannes Gutenberg University, 55128 Mainz, Germany
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15
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Del Duca V. A tale of two Regge limits. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201819200009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In light of the strong advances in understanding the mathematical structure of scattering amplitudes, we discuss the Regge limit of QCD and of theN= 4 Super Yang-Mills theory.
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16
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Vladimirov AA. Correspondence between Soft and Rapidity Anomalous Dimensions. PHYSICAL REVIEW LETTERS 2017; 118:062001. [PMID: 28234498 DOI: 10.1103/physrevlett.118.062001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Indexed: 06/06/2023]
Abstract
We establish a correspondence between ultraviolet singularities of soft factors for multiparticle production and rapidity singularities of soft factors for multiparton scattering. This correspondence is a consequence of the conformal mapping between scattering geometries. The correspondence is valid to all orders of perturbation theory and in this way, provides one with a proof of rapidity renormalization procedure for multiparton scattering [including the transverse momentum dependent (TMD) factorization as a special case]. As a by-product, we obtain an exact relation between the rapidity anomalous dimension and the well-known soft anomalous dimension. The three-loop expressions for TMD and a general multiparton scattering rapidity anomalous dimension are derived.
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Affiliation(s)
- Alexey A Vladimirov
- Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
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17
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Almelid Ø, Duhr C, Gardi E. Three-Loop Corrections to the Soft Anomalous Dimension in Multileg Scattering. PHYSICAL REVIEW LETTERS 2016; 117:172002. [PMID: 27824458 DOI: 10.1103/physrevlett.117.172002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Indexed: 06/06/2023]
Abstract
We present the three-loop result for the soft anomalous dimension governing long-distance singularities of multileg gauge-theory scattering amplitudes of massless partons. We compute all contributing webs involving semi-infinite Wilson lines at three loops and obtain the complete three-loop correction to the dipole formula. We find that nondipole corrections appear already for three colored partons, where the correction is a constant without kinematic dependence. Kinematic dependence appears only through conformally invariant cross ratios for four colored partons or more, and the result can be expressed in terms of single-valued harmonic polylogarithms of weight five. While the nondipole three-loop term does not vanish in two-particle collinear limits, its contribution to the splitting amplitude anomalous dimension reduces to a constant, and it depends only on the color charges of the collinear pair, thereby preserving strict collinear factorization properties. Finally, we verify that our result is consistent with expectations from the Regge limit.
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Affiliation(s)
- Øyvind Almelid
- Higgs Centre for Theoretical Physics, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, Scotland, United Kingdom
| | - Claude Duhr
- CERN Theory Division, 1211 Geneva 23, Switzerland
- Center for Cosmology, Particle Physics and Phenomenology (CP3), Université Catholique de Louvain, 1348 Louvain-La-Neuve, Belgium
| | - Einan Gardi
- Higgs Centre for Theoretical Physics, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, Scotland, United Kingdom
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18
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Henn JM, Mistlberger B. Four-Gluon Scattering at Three Loops, Infrared Structure, and the Regge Limit. PHYSICAL REVIEW LETTERS 2016; 117:171601. [PMID: 27824466 DOI: 10.1103/physrevlett.117.171601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Indexed: 06/06/2023]
Abstract
We compute the three-loop four-gluon scattering amplitude in maximally supersymmetric Yang-Mills theory, including its full color dependence. Our result is the first complete computation of a nonplanar four-particle scattering amplitude to three loops in four-dimensional gauge theory and consequently provides highly nontrivial data for the study of nonplanar scattering amplitudes. We present the amplitude as a Laurent expansion in the dimensional regulator to finite order, with coefficients composed of harmonic polylogarithms of uniform transcendental weight, and simple rational prefactors. Our computation provides an independent check of a recent result for three-loop corrections to the soft anomalous dimension matrix that predicts the general infrared singularity structure of massless gauge theory scattering amplitudes. Taking the Regge limit of our result, we determine the three-loop gluon Regge trajectory. We also find agreement with very recent predictions for subleading logarithms.
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Affiliation(s)
- J M Henn
- PRISMA Cluster of Excellence, Johannes Gutenberg University, 55099 Mainz, Germany
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Brambilla N, Eidelman S, Foka P, Gardner S, Kronfeld AS, Alford MG, Alkofer R, Butenschoen M, Cohen TD, Erdmenger J, Fabbietti L, Faber M, Goity JL, Ketzer B, Lin HW, Llanes-Estrada FJ, Meyer HB, Pakhlov P, Pallante E, Polikarpov MI, Sazdjian H, Schmitt A, Snow WM, Vairo A, Vogt R, Vuorinen A, Wittig H, Arnold P, Christakoglou P, Di Nezza P, Fodor Z, Garcia i Tormo X, Höllwieser R, Janik MA, Kalweit A, Keane D, Kiritsis E, Mischke A, Mizuk R, Odyniec G, Papadodimas K, Pich A, Pittau R, Qiu JW, Ricciardi G, Salgado CA, Schwenzer K, Stefanis NG, von Hippel GM, Zakharov VI. QCD and strongly coupled gauge theories: challenges and perspectives. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2014; 74:2981. [PMID: 25972760 PMCID: PMC4413533 DOI: 10.1140/epjc/s10052-014-2981-5] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Accepted: 07/05/2014] [Indexed: 05/17/2023]
Abstract
We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.
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Affiliation(s)
- N. Brambilla
- Physik Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - S. Eidelman
- Budker Institute of Nuclear Physics, SB RAS, Novosibirsk , 630090 Russia
- Novosibirsk State University, Novosibirsk , 630090 Russia
| | - P. Foka
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
| | - S. Gardner
- Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506-0055 USA
| | - A. S. Kronfeld
- Theoretical Physics Department, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510-5011 USA
| | - M. G. Alford
- Department of Physics, Washington University, St Louis, MO 63130 USA
| | | | - M. Butenschoen
- Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Wien, Austria
| | - T. D. Cohen
- Maryland Center for Fundamental Physics and Department of Physics, University of Maryland, College Park, MD 20742-4111 USA
| | - J. Erdmenger
- Max-Planck-Institute for Physics, Föhringer Ring 6, 80805 Munich, Germany
| | - L. Fabbietti
- Excellence Cluster “Origin and Structure of the Universe”, Technische Universität München, 85748 Garching, Germany
| | - M. Faber
- Atominstitut, Technische Universität Wien, 1040 Vienna, Austria
| | - J. L. Goity
- Hampton University, Hampton, VA 23668 USA
- Jefferson Laboratory, Newport News, VA 23606 USA
| | - B. Ketzer
- Physik Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
- Present Address: Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany
| | - H. W. Lin
- Department of Physics, University of Washington, Seattle, WA 98195-1560 USA
| | - F. J. Llanes-Estrada
- Department Fisica Teorica I, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - H. B. Meyer
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - P. Pakhlov
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia
| | - E. Pallante
- Centre for Theoretical Physics, University of Groningen, 9747 AG Groningen, The Netherlands
| | - M. I. Polikarpov
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia
| | - H. Sazdjian
- Institut de Physique Nucléaire CNRS/IN2P3, Université Paris-Sud, 91405 Orsay, France
| | - A. Schmitt
- Institut für Theoretische Physik, Technische Universität Wien, 1040 Vienna, Austria
| | - W. M. Snow
- Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, IN 47408 USA
| | - A. Vairo
- Physik Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - R. Vogt
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA 94551 USA
- Physics Department, University of California, Davis, CA 95616 USA
| | - A. Vuorinen
- Department of Physics and Helsinki Institute of Physics, University of Helsinki, Helsinki, P.O. Box 64, 00014 Finland
| | - H. Wittig
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - P. Arnold
- Department of Physics, University of Virginia, 382 McCormick Rd., P.O. Box 400714, Charlottesville, VA 22904-4714 USA
| | | | - P. Di Nezza
- Istituto Nazionale di Fisica Nucleare (INFN), Via E. Fermi 40, 00044 Frascati, Italy
| | - Z. Fodor
- Wuppertal University, 42119 Wuppertal, Germany
- Eötvös University, 1117 Budapest, Hungary
- Forschungszentrum Jülich, 52425 Jülich, Germany
| | - X. Garcia i Tormo
- Albert Einstein Center for Fundamental Physics, Institut für Theoretische Physik, Universität Bern, Sidlerstraße 5, 3012 Bern, Switzerland
| | - R. Höllwieser
- Atominstitut, Technische Universität Wien, 1040 Vienna, Austria
| | - M. A. Janik
- Faculty of Physics, Warsaw University of Technology, 00-662 Warsaw, Poland
| | - A. Kalweit
- European Organization for Nuclear Research (CERN), Geneva, Switzerland
| | - D. Keane
- Department of Physics, Kent State University, Kent, OH 44242 USA
| | - E. Kiritsis
- Crete Center for Theoretical Physics, Department of Physics, University of Crete, 71003 Heraklion, Greece
- Laboratoire APC, Université Paris Diderot, Paris Cedex 13, Sorbonne Paris-Cité , 75205 France
- Theory Group, Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - A. Mischke
- Faculty of Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - R. Mizuk
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Physical Engineering Institute, Moscow, 115409 Russia
| | - G. Odyniec
- Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720 USA
| | - K. Papadodimas
- Centre for Theoretical Physics, University of Groningen, 9747 AG Groningen, The Netherlands
| | - A. Pich
- IFIC, Universitat de València, CSIC, Apt. Correus 22085, 46071 València, Spain
| | - R. Pittau
- Departamento de Fisica Teorica y del Cosmos and CAFPE, Campus Fuentenueva s. n., Universidad de Granada, 18071 Granada, Spain
| | - J.-W. Qiu
- Physics Department, Brookhaven National Laboratory, Upton, NY 11973 USA
- C. N. Yang Institute for Theoretical Physics and Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 USA
| | - G. Ricciardi
- Dipartimento di Fisica, Università degli Studi di Napoli Federico II, 80126 Napoli, Italy
- INFN, Sezione di Napoli, 80126 Napoli, Italy
| | - C. A. Salgado
- Departamento de Fisica de Particulas y IGFAE, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
| | - K. Schwenzer
- Department of Physics, Washington University, St Louis, MO 63130 USA
| | - N. G. Stefanis
- Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - G. M. von Hippel
- PRISMA Cluster of Excellence, Institut für Kernphysik and Helmholtz Institut Mainz, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
| | - V. I. Zakharov
- Max-Planck-Institute for Physics, Föhringer Ring 6, 80805 Munich, Germany
- Institute of Theoretical and Experimental Physics, Moscow, 117218 Russia
- Moscow Institute for Physics and Technology, Dolgoprudny, 141700 Russia
- School of Biomedicine, Far Eastern Federal University, Sukhanova str 8, Vladivostok, 690950 Russia
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Ahmed T, Mahakhud M, Rana N, Ravindran V. Drell-Yan production at threshold to third order in QCD. PHYSICAL REVIEW LETTERS 2014; 113:112002. [PMID: 25259969 DOI: 10.1103/physrevlett.113.112002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Indexed: 06/03/2023]
Abstract
The recent computation on the full threshold contributions to Higgs boson production at next to next to next to leading order (N^{3}LO) in QCD contains valuable information on the soft gluons resulting from virtual and real emission partonic subprocesses. We use those from the real emissions to obtain the corresponding soft gluon contributions to Drell-Yan production and determine the missing δ(1-z) part of the N^{3}LO. The numerical impact of threshold effects demonstrates the importance of our results in the precision study with the Drell-Yan process at the LHC.
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Affiliation(s)
- Taushif Ahmed
- RECAPP, Harish-Chandra Research Institute, Allahabad, India
| | | | - Narayan Rana
- RECAPP, Harish-Chandra Research Institute, Allahabad, India
| | - V Ravindran
- The Institute of Mathematical Sciences, Chennai, India
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Melville S, Naculich S, Schnitzer H, White C. Wilson line approach to gravity in the high energy limit. Int J Clin Exp Med 2014. [DOI: 10.1103/physrevd.89.025009] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Dawson S, Lewis IM, Zeng M. Threshold resummed and approximate next-to-next-to-leading order results forW+W−pair production at the LHC. Int J Clin Exp Med 2013. [DOI: 10.1103/physrevd.88.054028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Becher T, Garcia i Tormo X. Electroweak Sudakov effects inW,Zandγproduction at large transverse momentum. Int J Clin Exp Med 2013. [DOI: 10.1103/physrevd.88.013009] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kidonakis N, Gonsalves RJ. Higher-order QCD corrections for theW-boson transverse momentum distribution. Int J Clin Exp Med 2013. [DOI: 10.1103/physrevd.87.014001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Bauer CW, Tackmann FJ, Walsh JR, Zuberi S. Factorization and resummation for dijet invariant mass spectra. Int J Clin Exp Med 2012. [DOI: 10.1103/physrevd.85.074006] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kilgore WB, Sturm C. Two-loop virtual corrections to Drell-Yan production at orderαsα3. Int J Clin Exp Med 2012. [DOI: 10.1103/physrevd.85.033005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kelley R, Schwartz MD. One-loop matching and next-to-next-to-leading log resummation for all partonic2→2processes in QCD. Int J Clin Exp Med 2011. [DOI: 10.1103/physrevd.83.045022] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Ferroglia A, Neubert M, Pecjak BD, Yang LL. Infrared Singularities and Soft Gluon Resummation with Massive Partons. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.nuclphysbps.2010.08.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Ferroglia A, Neubert M, Pecjak BD, Yang LL. Two-loop divergences of QCD scattering amplitudes with massive partons. PHYSICAL REVIEW LETTERS 2009; 103:201601. [PMID: 20365974 DOI: 10.1103/physrevlett.103.201601] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Indexed: 05/29/2023]
Abstract
We provide a complete description of the two-loop infrared singularities of scattering amplitudes with an arbitrary number of massive and massless partons in non-Abelian gauge theories. To this end, we calculate the two universal functions that completely specify the structure of three-parton correlations in the soft anomalous-dimension matrix at two-loop order in closed analytic form. Both functions are found to be suppressed like O(m(4)/s(2)) in the limit of small parton masses, in accordance with mass factorization theorems. On the other hand, they are unsuppressed near the threshold for pair production of two heavy particles. As an application, we calculate the two-loop anomalous-dimension matrix for qq --> tt near threshold and show that it is not diagonal in the s-channel singlet-octet basis.
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Affiliation(s)
- Andrea Ferroglia
- Institut für Physik (THEP), Johannes Gutenberg-Universität, D-55099 Mainz, Germany
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Kidonakis N. Two-loop soft anomalous dimensions and next-to-next-to-leading-logarithm resummation for heavy quark production. PHYSICAL REVIEW LETTERS 2009; 102:232003. [PMID: 19658925 DOI: 10.1103/physrevlett.102.232003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2009] [Indexed: 05/28/2023]
Abstract
I present results for two-loop soft anomalous dimensions for heavy quark production which control soft-gluon resummation at next-to-next-to-leading-logarithm accuracy. I derive an explicit expression for the exact result and study it numerically for top quark production via e(+)e(-)-->tt, and I construct a surprisingly simple but very accurate approximation. I show that the two-loop soft anomalous dimensions with massive quarks display a simple proportionality relation to the one-loop result only in the limit of vanishing quark mass. I also discuss the extension of the calculation to single top and top pair production in hadron colliders.
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