Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-06-28
JHEP0108:024,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTex, 21 pages, 4 PS figures. Version published in JHEP, for updates see hep-ph/0206178
Scientific paper
10.1088/1126-6708/2001/08/024
We analyze the implications of several recent cosmological and experimental measurements for the mass spectra of the Constrained MSSM (CMSSM). We compute the relic abundance of the neutralino and compare the new cosmologically expected and excluded mass ranges with those ruled out by the final LEP bounds on the lightest chargino and Higgs masses, with those excluded by current experimental values of $\br(B\to X_s \gamma)$, and with those favored by the recent measurement of the anomalous magnetic moment of the muon. We find that for $tan\beta\lsim 45$ there remains relatively little room for the mass spectra to be consistent with the interplay of the several constraints. On the other hand, at larger values of $tan\beta\$ the decreasing mass of the pseudoscalar Higgs gives rise to a wide resonance in the neutralino WIMP pair-annihilation, whose position depends on the ratio of top and bottom quark masses. As a consequence, the cosmologically expected regions consistent with other constraints often grow significantly and generally shift towards superpartner masses in the $\tev$ range.
Nihei Takeshi
Roszkowski Leszek
Ruiz de Austri Roberto
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