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Physical Review D 86 (2012) 052012
Exclusive Measurements of b -> s gamma Transition Rate and Photon Energy Spectrum
J. P. Lees1, V. Poireau1, V. Tisserand1, D. Bernard2, M. Verderi2, S. Emery3, G. Hamel de Monchenault3, G. Vasseur3, Ch. Yèche3, N. Arnaud4, M. Davier4, D. Derkach4, G. Grosdidier4, F. Le Diberder4, A. M. Lutz4, B. Malaescu4, P. Roudeau4, M. H. Schune4, A. Stocchi4, G. Wormser4, S. Akar5, E. Ben-Haim5, M. Bomben5, G.R. Bonneaud5, H. Briand5, G. Calderini5, J. Chauvau5, O. Hamon5, Ph. Leruste5, G. Marchiori5, J. Ocariz5, S. Sitt5
For the BABAR collaboration(s)
(2012)

We use 429 fb$^{-1}$ of $e^+e^-$ collision data collected at the $\Upsilon(4S)$ resonance with the BABAR detector to measure the radiative transition rate of $b\rightarrow s\gamma$ 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 $\mathcal{B}(\bar B \rightarrow X_{s}\gamma)=(3.29\pm 0.19\pm 0.48)\times 10^{-4}$ 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, $m_{b}$ and $\mu_{\pi}^{2}$, in the kinetic and shape function models.
1:  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2:  LLR - Laboratoire Leprince-Ringuet
3:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4:  LAL - Laboratoire de l'Accélérateur Linéaire
5:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1207.2520