The CMSSM parameter space at large tan β

John Ellis, Toby Falk, Gerardo Ganis, Keith A. Olive, Mark Srednicki

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280 Scopus citations


We extend previous combinations of LEP and cosmological relic density constraints on the parameter space of the constrained MSSM, with universal input supersymmetry-breaking parameters, to large tan β. We take account of the possibility that the lightest Higgs boson might weigh about 115 GeV, but also retain the possibility that it might be heavier. We include the most recent implementation of the b → sγ constraint at large tan β. We refine previous relic density calculations at large tan β by combining a careful treatment of the direct-channel Higgs poles in annihilation of pairs of neutralinos χ with a complete treatment of χ-τ̃ coannihilation, and discuss carefully uncertainties associated with the mass of the b quark. We find that coannihilation and pole annihilations allow the CMSSM to yield an acceptable relic density at large tan β, but it is consistent with all the constraints only if mχ > 140 (180) GeV for μ > 0 (μ< 0) for our default choices mb(mb)SMMS = 4.25 GeV, mt = 175 GeV, and A0 = 0.

Original languageEnglish (US)
Pages (from-to)236-246
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
StatePublished - Jun 21 2001

Bibliographical note

Funding Information:
We would like to thank W. de Boer and P. Gambino for useful discussions. The work of K.A.O. was partially supported by DOE grant DE-FG02-94ER-40823, and that of M.S. by NSF grant PHY-97-22022.


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