BABAR Collaboration (Including:

). (2008) Measurement of the B -> X-s gamma branching fraction and photon energy spectrum using the recoil method. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.77 (No.5). Article No.051103 . ISSN 1550-7998

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Abstract

We present a measurement of the branching fraction and photon-energy spectrum for the decay B -> X-s gamma using data from the BABAR experiment. The data sample corresponds to an integrated luminosity of 210 fb(-1), from which approximately 680 000 B (B) over bar events are tagged by a fully reconstructed hadronic decay of one of the B mesons. In the decay of the second B meson, an isolated high-energy photon is identified. We measure B(B -> X-s gamma) = (3.66 +/- 0.85(stat) +/- 0.60(syst)) x 10(-4) for photon energies E-gamma above 1.9 GeV in the B rest frame. From the measured spectrum we calculate the first and second moments for different minimum photon energies, which are used to extract the heavy-quark parameters m(b) and mu(2)(pi). In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Publisher:	American Physical Society
ISSN:	1550-7998
Date:	March 2008
Volume:	Vol.77
Number:	No.5
Number of Pages:	8
Page Range:	Article No.051103
Identification Number:	10.1103/PhysRevD.77.051103
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/30288

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