Gluino coannihilation revisited

Ellis, John; Luo, Feng; Olive, Keith A.

doi:10.1007/JHEP09(2015)127

Gluino coannihilation revisited

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP09(2015)127· OSTI ID:1454577

Ellis, John ^[1]; Luo, Feng ^[2]; Olive, Keith A. ^[3]

King's College London, London (United Kingdom). Dept. of Physics; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Div.; None
European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Div.
Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy and William I. Fine Theoretical Physics Inst.

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 .

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-88ER40388; FG02-93ER40762; SC0011842

OSTI ID:: 1454577

Alternate ID(s):: OSTI ID: 22584741

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 9 Vol. 2015; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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