New Cosmological and Experimental Constraints on the CMSSM
By L. Roszkowski, R. Ruiz de Austri, Takeshi Nihei. 2001
204 citations recorded by the source corpus.
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→Xsγ), and with those favored by the recent measurement of the anomalous magnetic moment of the muon. We find that for tan β45 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 β 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.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/da8c0c620581e48ee63486bc71d92bf3b8a8f192
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Citations in the corpus
- Sneutrino cold dark matter, a new analysis: Relic abundance and detection rates (2007, background): “ neutralinos in mSUGRA models, where the relic abundance is acceptable mostly in very specific regions of parameter space, where strong coannihilation occurs or the pole of the A–boson exchange is met [50, 51, 52]. We also notice that, since the masses of the Higgs bosons can vary, the dips in ξσ(sca”
- Neutralino relic density in minimal supergravity with co-annihilations (2002, methodology): “Working within the framework of the mSUGRA model, it was found [20, 22, 23, 29, 30] that at large tanβ, indeed large new regions of model parameter space gave rise to reasonable values for the CDM relic density.”