QCD-improved b{r_arrow}s{gamma} constraints on the minimal supergravity model
- Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
Recent advances in the QCD corrections to b{r_arrow}s{gamma} decay in the MSSM include (i) evaluation of the relevant operators, Wilson coefficients, and anomalous dimension matrix elements for the various MSSM effective theories valid at scales beyond Q=M{sub W}, (ii) calculations of most of the needed anomalous dimension matrix elements to next-to-leading order for scales m{sub b}{approx_lt}Q{lt}M{sub W}, and (iii) calculations of O({alpha}{sub s}) virtual and bremsstrahlung corrections to the b{r_arrow}s{gamma} decay operators at scale Q{approximately}m{sub b}. We assemble all these known results to gain an estimate of B(b{r_arrow}s{gamma}) for the parameter space of the minimal supergravity model (MSUGRA). We find a much reduced scale dependence of our result compared to usual leading-log evaluations. Comparison with the latest CLEO results yields stringent constraints on parameter space. Much of MSUGRA parameter space is ruled out for {mu}{lt}0, especially for large tan{beta}. We compare these results with other constraints from cosmology and nonstandard vacua. Also, we compare with expectations for discovering MSUGRA at CERN LEP 2, the Fermilab Tevatron, and the CERN LHC. {copyright} {ital 1997} {ital The American Physical Society}
- DOE Contract Number:
- FG05-87ER40319
- OSTI ID:
- 467806
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 5 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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