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Title: QCD-improved 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 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}

Authors:
;  [1]
  1. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
Publication Date:
OSTI Identifier:
467806
DOE Contract Number:  
FG05-87ER40319
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. QCD-improved 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. QCD-improved 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 . "QCD-improved 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 = {QCD-improved 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 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}},
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}
}