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Title: Gluino coannihilation revisited

Abstract

In this study, some variants of the MSSM feature a strip in parameter space where the lightest neutralino χ is identified as the lightest supersymmetric particle (LSP), the gluino g ~ is the next-to-lightest supersymmetric particle (NLSP) and is nearly degenerate with χ, and the relic cold dark matter density is brought into the range allowed by astrophysics and cosmology by coannihilation with the gluino NLSP. We calculate the relic density along this gluino coannihilation strip in the MSSM, including the effects of gluino-gluino bound states and initial-state Sommerfeld enhancement, and taking into account the decoupling of the gluino and LSP densities that occurs for large values of the squark mass m q ~. We find that bound-state effects can increase the maximum m χ for which the relic cold dark matter density lies within the range favoured by astrophysics and cosmology by as much as ~50% if m q ~/m g ~=1.1 , and that the LSP may weigh up to ~8 TeV for a wide range of m q ~/m g ~≲100 .

Authors:
 [1];  [2];  [3]
  1. King's College London, London (United Kingdom). Dept. of Physics; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Div.
  2. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Div.
  3. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy and William I. Fine Theoretical Physics Inst.
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1454577
Grant/Contract Number:  
SC0011842; FG02-88ER40388; FG02-93ER40762
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 9; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; Supersymmetry Phenomenology

Citation Formats

Ellis, John, Luo, Feng, and Olive, Keith A. Gluino coannihilation revisited. United States: N. p., 2015. Web. doi:10.1007/JHEP09(2015)127.
Ellis, John, Luo, Feng, & Olive, Keith A. Gluino coannihilation revisited. United States. doi:10.1007/JHEP09(2015)127.
Ellis, John, Luo, Feng, and Olive, Keith A. Mon . "Gluino coannihilation revisited". United States. doi:10.1007/JHEP09(2015)127. https://www.osti.gov/servlets/purl/1454577.
@article{osti_1454577,
title = {Gluino coannihilation revisited},
author = {Ellis, John and Luo, Feng and Olive, Keith A.},
abstractNote = {In this study, some variants of the MSSM feature a strip in parameter space where the lightest neutralino χ is identified as the lightest supersymmetric particle (LSP), the gluino g~ is the next-to-lightest supersymmetric particle (NLSP) and is nearly degenerate with χ, and the relic cold dark matter density is brought into the range allowed by astrophysics and cosmology by coannihilation with the gluino NLSP. We calculate the relic density along this gluino coannihilation strip in the MSSM, including the effects of gluino-gluino bound states and initial-state Sommerfeld enhancement, and taking into account the decoupling of the gluino and LSP densities that occurs for large values of the squark mass mq~. We find that bound-state effects can increase the maximum m χ for which the relic cold dark matter density lies within the range favoured by astrophysics and cosmology by as much as ~50% if mq~/mg~=1.1 , and that the LSP may weigh up to ~8 TeV for a wide range of mq~/mg~≲100 .},
doi = {10.1007/JHEP09(2015)127},
journal = {Journal of High Energy Physics (Online)},
number = 9,
volume = 2015,
place = {United States},
year = {2015},
month = {9}
}

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