Calculations of Neutralino-Stop Coannihilation in the CMSSM

Details Calculations of Neutralino-Stop Coannihilation in the CMSSM Calculations of Neutralino-Stop Coannihilation in the CMSSM

2001-12-07

arxiv.org/abs/hep-ph/0112113v1

Astropart.Phys.18:395-432,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

45 pages, 7 figures

Scientific paper

10.1016/S0927-6505(02)00151-2

We present detailed calculations of the neutralino-stop coannihilation channels that have the largest impact on the relic neutralino density in the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which scalar masses m_0, gaugino masses m_1/2 and the trilinear soft supersymmetry-breaking parameters A_0 are each assumed to be universal at some input grand unification scale. The most important stop-stop* and stop-stop annihilation channels are also calculated, as well as stop-slepton coannihilation channels. We illustrate the importance of these new coannihilation calculations when A_0 is relatively large. While they do not increase the range of m_1/2 and hence neutralino mass allowed by cosmology, these coannihilation channels do open up new `tails' of parameter space extending to larger values of m_0.

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