Abstract
Using 88.9 million BB¯ events collected by the BABAR detector at the Υ(4S), we measure the branching fraction for the radiative penguin process B→Xsγ from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy Eγ>1.9 GeV is B(b→sγ)=(3.27±0.18(stat)−0.40+0.55(syst)−0.09+0.04(theory))×10−4. We also measure the isospin asymmetry between B−→Xsu¯γ and B¯0→Xsd¯γ to be Δ0−=−0.006±0.058(stat)±0.009(syst)±0.024(B¯0/B−). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters mb and μπ2. The fitted parameters are consistent with those obtained from semileptonic B→Xcℓν decays, and are useful inputs for the extraction of |Vub| from measurements of semileptonic B→Xuℓν decays.Received 31 July 2005DOI:https://doi.org/10.1103/PhysRevD.72.052004©2005 American Physical Society
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