Precision Measurement of the B→Xsγ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry ACP(B→Xs+dγ)

The BaBar Collaboration, Philip Clark

Research output: Contribution to journalArticlepeer-review

Abstract

The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→Xsγ plus B→Xdγ, is studied using a data sample of (382.8±4.2)×106 Υ(4S)→B\overli neB decays collected by the \babar\ experiment at SLAC. The spectrum is used to extract the branching fraction B(B→Xsγ)=(3.21±0.33)×10−4 for Eγ>1.8\gev and the direct CP asymmetry ACP(B→Xs+dγ)=0.057±0.063. The effects of detector resolution and Doppler smearing are unfolded to measure the photon energy spectrum in the B meson rest frame.
Original languageEnglish
Pages (from-to)191801
Number of pages1
JournalPhysical Review Letters
Volume109
Early online date12 Jul 2012
DOIs
Publication statusPublished - 9 Nov 2012

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