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Phys. Rev. D 72, 052004 (2005) [17 pages]

Measurements of the BXsγ branching fraction and photon spectrum from a sum of exclusive final states

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B. Aubert et al. BABAR Collaboration
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Received 31 July 2005; published 14 September 2005

Using 88.9 million BB̅ events collected by the BABAR detector at the Υ(4S), we measure the branching fraction for the radiative penguin process BXsγ from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy Eγ>1.9  GeV is B(bsγ)=(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-Xsu̅ γ and B̅ 0Xsd̅ γ to be Δ0-=-0.006±0.058(stat)±0.009(syst)±0.024(B̅ 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 BXcν decays, and are useful inputs for the extraction of |Vub| from measurements of semileptonic BXuν decays.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.052004
DOI:
10.1103/PhysRevD.72.052004
PACS:
13.35.Dx, 11.30.Hv, 14.60.Fg