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Measurement of Inclusive RadiativeB-Meson Decays with a Photon Energy Threshold of 1.7 GeV
Limosani, A.,Aihara, H.,Arinstein, K.,Aushev, T.,Bakich, A. M.,Balagura, V.,Barberio, E.,Bay, A.,Belous, K.,Bischofberger, M.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T. E.,Chang, P.,Chao, Y.,Ch American Physical Society 2009 Physical Review Letters Vol.103 No.24
<P>Using 605 fb(-1) of data collected at the Upsilon(4S) resonance we present a measurement of the inclusive radiative B-meson decay channel, B-->X(s)gamma. For the lower photon energy thresholds of 1.7, 1.8, 1.9, and 2.0 GeV, as defined in the rest frame of the B meson, we measure the partial branching fraction and the mean and variance of the photon energy spectrum. At the 1.7 GeV threshold we obtain the partial branching fraction BF(B-->X(s)}gamma)=(3.45+/-0.15+/-0.40)x10(-4), where the errors are statistical and systematic.</P>