Abstract

The constraints on the minimal supergravity model from the b → sγ decay are studied. A large domain in the parameter space for the model satisfies the CLEO bound, BR(b → sγ) < 5.4 × 10−4. However, the allowed domain is expected to diminish significantly with an improved bound on this decay. The dependence of the b → sγ branching ratio on various parameters is studied in detail. It is found that, for At < 0 and the top quark mass within the vicinity of the center of the CDF value, mtpole = 174±17 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 At negative when the GUT coupling constant is slightly reduced. For At > 0, however, the branching ratio is much less sensitive to small changes in mt, and αG.)

Notes

Originally posted at http://arxiv.org/abs/hep-ph/9406346v1. Preprint of an article published in Physical Review D, v.51 no.3, 1995.

Keywords

decay, minimal supergravity model, high energy physics phenomenology

Subject Categories

Supergravity, Phenomenological theory (Physics)

Disciplines

Physics

Publication Date

1995


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