QCDimproved b{r_arrow}s{gamma} constraints on the minimal supergravity model
Abstract
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 nexttoleading 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 leadinglog 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}
 Authors:

 Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
 Publication Date:
 OSTI Identifier:
 467806
 DOE Contract Number:
 FG0587ER40319
 Resource Type:
 Journal Article
 Journal Name:
 Physical Review, D
 Additional Journal Information:
 Journal Volume: 55; Journal Issue: 5; Other Information: PBD: Mar 1997
 Country of Publication:
 United States
 Language:
 English
 Subject:
 66 PHYSICS; B QUARKS; RADIATIVE DECAY; SUPERGRAVITY; LIMITING VALUES; QUANTUM CHROMODYNAMICS; S QUARKS; ANOMALOUS DIMENSION; MATRIX ELEMENTS; MOMENTUM TRANSFER; BREMSSTRAHLUNG; CORRECTIONS; COSMOLOGY; ELECTROMAGNETIC PARTICLE DECAY
Citation Formats
Baer, H, and Brhlik, M. QCDimproved b{r_arrow}s{gamma} constraints on the minimal supergravity model. United States: N. p., 1997.
Web. doi:10.1103/PhysRevD.55.3201.
Baer, H, & Brhlik, M. QCDimproved b{r_arrow}s{gamma} constraints on the minimal supergravity model. United States. https://doi.org/10.1103/PhysRevD.55.3201
Baer, H, and Brhlik, M. Sat .
"QCDimproved b{r_arrow}s{gamma} constraints on the minimal supergravity model". United States. https://doi.org/10.1103/PhysRevD.55.3201.
@article{osti_467806,
title = {QCDimproved b{r_arrow}s{gamma} constraints on the minimal supergravity model},
author = {Baer, H and Brhlik, M},
abstractNote = {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 nexttoleading 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 leadinglog 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}},
doi = {10.1103/PhysRevD.55.3201},
url = {https://www.osti.gov/biblio/467806},
journal = {Physical Review, D},
number = 5,
volume = 55,
place = {United States},
year = {1997},
month = {3}
}