3
|
Ellis J, Evans JL, Luo F, Olive KA, Zheng J. Stop coannihilation in the CMSSM and SubGUT models. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2018; 78:425. [PMID: 30996669 PMCID: PMC6435225 DOI: 10.1140/epjc/s10052-018-5831-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 04/21/2018] [Indexed: 06/09/2023]
Abstract
Stop coannihilation may bring the relic density of heavy supersymmetric dark matter particles into the range allowed by cosmology. The efficiency of this process is enhanced by stop-antistop annihilations into the longitudinal (Goldstone) modes of the W and Z bosons, as well as by Sommerfeld enhancement of stop annihilations and the effects of bound states. Since the couplings of the stops to the Goldstone modes are proportional to the trilinear soft supersymmetry-breaking A-terms, these annihilations are enhanced when the A-terms are large. However, the Higgs mass may be reduced below the measured value if the A-terms are too large. Unfortunately, the interpretation of this constraint on the stop coannihilation strip is clouded by differences between the available Higgs mass calculators. For our study, we use as our default calculator FeynHiggs 2.13.0, the most recent publicly available version of this code. Exploring the CMSSM parameter space, we find that along the stop coannihilation strip the masses of the stops are severely split by the large A-terms. This suppresses the Higgs mass drastically for μ andA 0 > 0 , whilst the extent of the stop coannihilation strip is limited forA 0 < 0 and either sign of μ . However, in sub-GUT models, reduced renormalization-group running mitigates the effect of the large A-terms, allowing larger LSP masses to be consistent with the Higgs mass calculation. We give examples where the dark matter particle mass may reach ≳ 8 TeV.
Collapse
Affiliation(s)
- John Ellis
- Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, Strand, London, WC2R 2LS UK
- National Institute of Chemical Physics and Biophysics, Rävala 10, 10143 Tallinn, Estonia
- Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland
| | | | - Feng Luo
- Kavli IPMU (WPI) UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583 Japan
| | - Keith A. Olive
- William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 USA
| | - Jiaming Zheng
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo, 113-0033 Japan
| |
Collapse
|
4
|
Bagnaschi E, Borsato M, Sakurai K, Buchmueller O, Cavanaugh R, Chobanova V, Citron M, Costa JC, De Roeck A, Dolan MJ, Ellis JR, Flächer H, Heinemeyer S, Isidori G, Lucio M, Luo F, Santos DM, Olive KA, Richards A, Weiglein G. Likelihood analysis of the minimal AMSB model. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2017; 77:268. [PMID: 28515671 PMCID: PMC5409153 DOI: 10.1140/epjc/s10052-017-4810-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 04/05/2017] [Indexed: 06/07/2023]
Abstract
We perform a likelihood analysis of the minimal anomaly-mediated supersymmetry-breaking (mAMSB) model using constraints from cosmology and accelerator experiments. We find that either a wino-like or a Higgsino-like neutralino LSP, [Formula: see text], may provide the cold dark matter (DM), both with similar likelihoods. The upper limit on the DM density from Planck and other experiments enforces [Formula: see text] after the inclusion of Sommerfeld enhancement in its annihilations. If most of the cold DM density is provided by the [Formula: see text], the measured value of the Higgs mass favours a limited range of [Formula: see text] (and also for [Formula: see text] if [Formula: see text]) but the scalar mass [Formula: see text] is poorly constrained. In the wino-LSP case, [Formula: see text] is constrained to about [Formula: see text] and [Formula: see text] to [Formula: see text], whereas in the Higgsino-LSP case [Formula: see text] has just a lower limit [Formula: see text] ([Formula: see text]) and [Formula: see text] is constrained to [Formula: see text] in the [Formula: see text] ([Formula: see text]) scenario. In neither case can the anomalous magnetic moment of the muon, [Formula: see text], be improved significantly relative to its Standard Model (SM) value, nor do flavour measurements constrain the model significantly, and there are poor prospects for discovering supersymmetric particles at the LHC, though there are some prospects for direct DM detection. On the other hand, if the [Formula: see text] contributes only a fraction of the cold DM density, future LHC [Formula: see text]-based searches for gluinos, squarks and heavier chargino and neutralino states as well as disappearing track searches in the wino-like LSP region will be relevant, and interference effects enable [Formula: see text] to agree with the data better than in the SM in the case of wino-like DM with [Formula: see text].
Collapse
Affiliation(s)
| | - M. Borsato
- Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - K. Sakurai
- Science Laboratories, Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, South Road, Durham, DH1 3LE UK
- Faculty of Physics, Institute of Theoretical Physics, University of Warsaw, ul. Pasteura 5, 02-093 Warsaw, Poland
| | - O. Buchmueller
- High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ UK
| | - R. Cavanaugh
- Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 USA
- Physics Department, University of Illinois at Chicago, Chicago, IL 60607-7059 USA
| | - V. Chobanova
- Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - M. Citron
- High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ UK
| | - J. C. Costa
- High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ UK
| | - A. De Roeck
- Experimental Physics Department, CERN, 1211 Geneva 23, Switzerland
- Antwerp University, 2610 Wilrijk, Belgium
| | - M. J. Dolan
- ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, University of Melbourne, Melbourne, 3010 Australia
| | - J. R. Ellis
- Theoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London, WC2R 2LS UK
- Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - H. Flächer
- H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL UK
| | - S. Heinemeyer
- Campus of International Excellence UAM+CSIC, Cantoblanco, 28049 Madrid, Spain
- Instituto de Física Teórica UAM-CSIC, C/ Nicolas Cabrera 13-15, 28049 Madrid, Spain
- Instituto de Física de Cantabria (CSIC-UC), Avda. de Los Castros s/n, 39005 Cantabria, Spain
| | - G. Isidori
- Physik-Institut, Universität Zürich, 8057 Zurich, Switzerland
| | - M. Lucio
- Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - F. Luo
- Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583 Japan
| | - D. Martínez Santos
- Universidade de Santiago de Compostela, 15706 Santiago de Compostela, Spain
| | - K. A. Olive
- William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 USA
| | - A. Richards
- High Energy Physics Group, Blackett Laboratory, Imperial College, Prince Consort Road, London, SW7 2AZ UK
| | - G. Weiglein
- DESY, Notkestraße 85, 22607 Hamburg, Germany
| |
Collapse
|
5
|
Ellis J, Evans JL, Luo F, Nagata N, Olive KA, Sandick P. Beyond the CMSSM without an accelerator: proton decay and direct dark matter detection. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS 2016; 76:8. [PMID: 26766922 PMCID: PMC4701827 DOI: 10.1140/epjc/s10052-015-3842-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 12/11/2015] [Indexed: 06/05/2023]
Abstract
We consider two potential non-accelerator signatures of generalizations of the well-studied constrained minimal supersymmetric standard model (CMSSM). In one generalization, the universality constraints on soft supersymmetry-breaking parameters are applied at some input scale [Formula: see text]below the grand unification (GUT) scale [Formula: see text], a scenario referred to as 'sub-GUT'. The other generalization we consider is to retain GUT-scale universality for the squark and slepton masses, but to relax universality for the soft supersymmetry-breaking contributions to the masses of the Higgs doublets. As with other CMSSM-like models, the measured Higgs mass requires supersymmetric particle masses near or beyond the TeV scale. Because of these rather heavy sparticle masses, the embedding of these CMSSM-like models in a minimal SU(5) model of grand unification can yield a proton lifetime consistent with current experimental limits, and may be accessible in existing and future proton decay experiments. Another possible signature of these CMSSM-like models is direct detection of supersymmetric dark matter. The direct dark matter scattering rate is typically below the reach of the LUX-ZEPLIN (LZ) experiment if [Formula: see text] is close to [Formula: see text], but it may lie within its reach if [Formula: see text] GeV. Likewise, generalizing the CMSSM to allow non-universal supersymmetry-breaking contributions to the Higgs offers extensive possibilities for models within reach of the LZ experiment that have long proton lifetimes.
Collapse
Affiliation(s)
- John Ellis
- />Theoretical Physics and Cosmology Group, Department of Physics, King’s College London, Strand, London, WC2R 2LS UK
- />TH Division, Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - Jason L. Evans
- />William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 USA
| | - Feng Luo
- />TH Division, Physics Department, CERN, 1211 Geneva 23, Switzerland
| | - Natsumi Nagata
- />William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 USA
- />Kavli IPMU (WPI), UTIAS, University of Tokyo, Kashiwa, Chiba 277-8583 Japan
| | - Keith A. Olive
- />William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455 USA
| | - Pearl Sandick
- />Department of Physics and Astronomy, University of Utah, Salt Lake City, UT 84112 USA
| |
Collapse
|