Constraints on the minimal supergravity model from the b ---> s gamma decay

Mar, 1994
18 pages
Published in:
  • Phys.Rev.D 51 (1995) 1371-1376
e-Print:
Report number:
  • CTP-TAMU-03-94,
  • NUB-TH-7316-94,
  • CERN-TH-3092-94

Citations per year

1994199820022006201002468
Abstract:
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.
  • supergravity
  • bottom
  • quark: radiative decay
  • radiative decay: quark
  • quark: branching ratio
  • mass: top
  • top: mass
  • B: radiative decay
  • radiative decay: B
  • B: branching ratio
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