Exclusive Measurements of the b to s gamma Transition Rate and Photon Energy Spectrum

/Annecy, LAPP; /Barcelona U., ECM; /Bari U. /INFN, Bari; /LBL, Berkeley /UC, Berkeley; /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U.; /Ruhr U., Bochum; Asgeirsson, D. J.; Blinov, V. E.; Brown, David Nathan; Buzykaev, A. R.; Eigen, G.; Garra Tico, J.; Grauges, E.; Hearty, C.; Kerth, L. T.; Khan, A.; Koch, H.; Kolomensky, Yu. G.; Lees, J. P.; Lynch, G.; Mattison, T. S.; McKenna, J. A.; Palano, A.; Poireau, V.; Schroeder, T.; Stugu, B.; Tisserand, V.; U., /Bergen; U., /British Columbia; U., /Brunel

Exclusive Measurements of the b to s gamma Transition Rate and Photon Energy Spectrum

Authors: LAPP /Annecy
ECM /Barcelona U.
Bari /Bari U. /INFN
Berkeley /UC, Berkeley /LBL
IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Novosibirsk
Bochum /Ruhr U.
D. J. Asgeirsson
V. E. Blinov
David Nathan Brown
A. R. Buzykaev
G. Eigen
J. Garra Tico
E. Grauges
C. Hearty
L. T. Kerth
A. Khan
H. Koch
Yu. G. Kolomensky
J. P. Lees
G. Lynch
T. S. Mattison
J. A. McKenna
A. Palano
V. Poireau
T. Schroeder
B. Stugu
V. Tisserand
/Bergen U.
/British Columbia U.
/Brunel U.
Publication date: 30 August 2012
Publisher: SLAC National Accelerator Laboratory

Abstract

We use 429 fb{sup -1} of e{sup +}e{sup -} collision data collected at the {Upsilon}(4S) resonance with the BABAR detector to measure the radiative transition rate of b {yields} s{gamma} with a sum of 38 exclusive final states. The inclusive branching fraction with a minimum photon energy of 1.9 GeV is found to be {Beta}({bar B} {yields} Xs{gamma}) = (3.29 {+-} 0.19 {+-} 0.48) x 10{sup -4} where the first uncertainty is statistical and the second is systematic. We also measure the first and second moments of the photon energy spectrum and extract the best fit values for the heavy-quark parameters, m{sub b} and {mu}{sub {pi}}{sup 2}, in the kinetic and shape function models

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