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.)
decay, minimal supergravity model, high energy physics phenomenology
Supergravity, Phenomenological theory (Physics)
Wu, Jizhi; Arnowitt, Richard; and Nath, Pran, "Constraints on the minimal supergravity model from the b→sγ decay" (1995). Physics Faculty Publications. Paper 72. http://hdl.handle.net/2047/d20000425
Click button above to open, or right-click to save.