skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Stop coannihilation in the CMSSM and SubGUT models

Abstract

Stop coannihilation may bring the relic density of heavy supersymmetric dark matter particles into the range allowed by cosmology. The efficiency of this pro-cess is enhanced by stop-antistop annihilations into the lon-gitudinal (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 trilin-ear soft supersymmetry-breaking A-terms, these annihila-tions are enhanced when the A-terms are large. Yet, 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 calcula-tor FeynHiggs 2.13.0, the most recent publicly avail-able 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 and A 0 > 0, whilst the extent of the stop coannihilation strip is limited for A 0 < 0 and either sign of μ. However, inmore » 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.« less

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. King's College London (United Kingdom); National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  2. Korea Inst. for Advanced Study (KIAS), Seoul (South Korea)
  3. Univ. of Tokyo, Kashiwa (Japan)
  4. Univ. of Minnesota, Minneapolis, MN (United States)
  5. Univ. of Tokyo, Tokyo (Japan)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1510034
Grant/Contract Number:  
SC0011842; JP26104009
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 5; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Ellis, John, Evans, Jason L., Luo, Feng, Olive, Keith A., and Zheng, Jiaming. Stop coannihilation in the CMSSM and SubGUT models. United States: N. p., 2018. Web. doi:10.1140/epjc/s10052-018-5831-z.
Ellis, John, Evans, Jason L., Luo, Feng, Olive, Keith A., & Zheng, Jiaming. Stop coannihilation in the CMSSM and SubGUT models. United States. doi:10.1140/epjc/s10052-018-5831-z.
Ellis, John, Evans, Jason L., Luo, Feng, Olive, Keith A., and Zheng, Jiaming. Mon . "Stop coannihilation in the CMSSM and SubGUT models". United States. doi:10.1140/epjc/s10052-018-5831-z. https://www.osti.gov/servlets/purl/1510034.
@article{osti_1510034,
title = {Stop coannihilation in the CMSSM and SubGUT models},
author = {Ellis, John and Evans, Jason L. and Luo, Feng and Olive, Keith A. and Zheng, Jiaming},
abstractNote = {Stop coannihilation may bring the relic density of heavy supersymmetric dark matter particles into the range allowed by cosmology. The efficiency of this pro-cess is enhanced by stop-antistop annihilations into the lon-gitudinal (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 trilin-ear soft supersymmetry-breaking A-terms, these annihila-tions are enhanced when the A-terms are large. Yet, 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 calcula-tor FeynHiggs 2.13.0, the most recent publicly avail-able 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 and A0 > 0, whilst the extent of the stop coannihilation strip is limited for A0 < 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.},
doi = {10.1140/epjc/s10052-018-5831-z},
journal = {European Physical Journal. C, Particles and Fields},
number = 5,
volume = 78,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: