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High Energy Physics - Phenomenology

arXiv:hep-ph/0205026 (hep-ph)
[Submitted on 2 May 2002]

Title:Neutralino-stop coannihilation in the CMSSM

Authors:Yudi Santoso
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Abstract: Neutralino as the lightest supersymmetric particle (LSP) is a candidate for supersymmetric dark matter. It is known that coannihilation effects could be important in neutralino relic density calculation. Here we present some results on neutralino-stop coannihilation in the CMSSM. In this model, the lighter stop can be degenerate with the lightest neutralino chi when |A_0| is not equal to 0 and large, more specifically when the lighter stop mass is suppressed by large off-diagonal terms in the stop square mass matrix. In the region where the stop is slightly heavier than the neutralino, the coannihilation effect brings the relic density into the range favored by cosmology. While the neutralino-stop coannihilation channels do not increase the range of m_chi, they do extend the cosmologically preferred region to larger values of m_0.
Comments: 5 pages, latex, 2 eps figures, Talk presented at Dark Matter 2002, February 20 - 22, 2002, Marina del Rey, CA
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: UMN-TH-2051/02, TPI-MINN-02/11
Cite as: arXiv:hep-ph/0205026
  (or arXiv:hep-ph/0205026v1 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0205026
Related DOI: https://doi.org/10.1016/S0920-5632%2803%2902098-X

Submission history

From: Yudi Santoso [view email]
[v1] Thu, 2 May 2002 16:49:10 UTC (39 KB)
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