CONSTRAINTS ON THE MINIMAL SUPERGRAVITY MODEL FROM THE B-]S-GAMMA DECAY

被引:32
作者
WU, JH
ARNOWITT, R
NATH, P
机构
[1] CERN,DIV THEORET PHYS,CH-1211 GENEVA 23,SWITZERLAND
[2] NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115
来源
PHYSICAL REVIEW D | 1995年 / 51卷 / 03期
关键词
D O I
10.1103/PhysRevD.51.1371
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 B(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 top squark 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. © 1995 The American Physical Society.
引用
收藏
页码:1371 / 1376
页数:6
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