Branching Fraction and Photon Energy Spectrum b -> s gamma
High Energy Physics - Experiment
2010-04-08 v3
Abstract
We have measured the branching fraction and photon energy spectrum for the radiative penguin process b -> s gamma. We find BR(b -> s gamma) = (3.21 +- 0.43 +- 0.27 +0.18 -0.10) 10^(-4), where the errors are statistical, systematic, and from theory corrections. We obtain first and second moments of the photon energy spectrum above 2.0 GeV, < E_\gamma > = 2.346 +- 0.032 +- 0.011 GeV, and <E^2_gamma> - <E_gamma>^2 = 0.0226 +- 0.0066 +- 0.0020 GeV^2, where the errors are statistical and systematic. From the first moment we obtain (in MS[Bar], to order 1/M^3 and beta_0 alpha_s^2) the HQET parameter Lambda[Bar] = 0.35 +- 0.08 +- 0.10 GeV.
Cite
@article{arxiv.hep-ex/0108032,
title = {Branching Fraction and Photon Energy Spectrum b -> s gamma},
author = {S. Chen and CLEO Collaboration},
journal= {arXiv preprint arXiv:hep-ex/0108032},
year = {2010}
}
Comments
11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRL