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Precision Measurement of the B→X_{s}γ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A_{CP}(B→X_{s+d}γ)

J. P. Lees
•
V. Poireau
•
V. Tisserand
altro
S. L. Wu
2012
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
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)×106Υ(4S)→BB ̄ 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>1.8GeV 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.
DOI
10.1103/PhysRevLett.109.191801
WOS
WOS:000310869600003
Archivio
http://hdl.handle.net/11368/2767932
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84869006752
Diritti
metadata only access
Soggetti
  • Decays of bottom meso...

  • Charge conjugation pa...

  • Determination of Koba...

Web of Science© citazioni
56
Data di acquisizione
Mar 27, 2024
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