Constraints on the minimal supergravity model from the b->s+γdecay

Details Constraints on the minimal supergravity model from the b->s+γdecay Constraints on the minimal supergravity model from the b->s+γdecay

1994-06-21

arxiv.org/abs/hep-ph/9406346v1

Phys.Rev.D51:1371-1376,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, plain tex file, three figures avaliable upon request, CTP-TAMU-03/94, NUB-TH.7316/94, and CERN-TH.3092/94

Scientific paper

10.1103/PhysRevD.51.1371

The constraints on the minimal supergravity model from the b->s+\gamma decay are studied. A large domain in the parameter space for the model satisfies the CLEO bound, BR(b->s+\gamma)<5.4X10^{-4}. However, the allowed domain is expected to diminish significantly with an improved bound on this decay. The dependence of the b->s+\gamma branching ratio on various parameters is studied in detail. It is found that, for A_t<0 and the top quark mass within the vicinity of the center of the CDF value, m_t^{pole}=174\pm17 GeV, there exists only a small allowed domain because the light stop is tachyonic for most of the parameter space. A similar phenomenon exists for a lighter top and A_t negative when the GUT coupling constant is slightly reduced. For A_t>0, however, the branching ratio is much less sensitive to small changes in m_t, and \alpha_G.

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