b{r_arrow}s{gamma} with large tan {beta} in a MSSM analysis constrained by a realistic SO(10) model
- Department of Physics, Indiana University, Swain Hall West 117, Bloomington, Indiana 47405 (United States)
- Department of Physics, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210 (United States)
The study of the MSSM in the large tan {beta} regime has to include correlations between the constraints presented by the low energy values of the {ital b} quark mass and BR(b{r_arrow}s{gamma}). Both quantities receive SUSY contributions enhanced by tan {beta} and have a major impact on the MSSM analysis. Here we summarize the results of such a study constrained by a complete SO(10) model. The dominant effects to the analysis come from third generation Yukawa couplings and a GUT threshold to {alpha}{sub s}. We show that a small negative GUT correction to {alpha}{sub s} accommodates {alpha}{sub s}(M{sub Z}){le}0.118 and {delta}m{sub b}{sup SUSY}{gt}0. Since the latter quantity is positive this opens up two options to fit the measured rate for b{r_arrow}s{gamma}. The two distinct fits differ by the overall sign of the amplitude for this process. They work equally well in complementary regions of the allowed SUSY parameter space. We show plots of the partial contributions to the coefficient C{sub 7}(M{sub Z}) in the (m{sub 0},M{sub 1/2}) plane in each of these best fits. We conclude that an attractive SO(10)-derived regime of the MSSM remains a viable option. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 347071
- Journal Information:
- Physical Review, D, Vol. 59, Issue 9; Other Information: PBD: May 1999
- Country of Publication:
- United States
- Language:
- English
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