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Measurement of the branching fraction and photon energy moments of B -> X-s gamma and A(CP)(B -> Xs+d gamma)
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BaBar Collaboration (Including:
). (2006) Measurement of the branching fraction and photon energy moments of B -> X-s gamma and A(CP)(B -> Xs+d gamma). PHYSICAL REVIEW LETTERS, 97 (17). -. doi:10.1103/PhusRevLett.97.171803 ISSN 0031-9007.Research output not available from this repository.
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Official URL: http://dx.doi.org/10.1103/PhusRevLett.97.171803
Abstract
The photon spectrum in B -> X-s gamma decay, where X-s is any strange hadronic state, is studied using a data sample of 88.5x10(6) e(+)e(-)->Upsilon(4S)-> B(B) over bar decays collected by the BABAR experiment at the Stanford Linear Accelerator Center. The partial branching fraction, Delta B(B -> X-s gamma)=(3.67 +/- 0.29(stat)+/- 0.34(syst)+/- 0.29(model))x10(-4), the first moment < E-gamma >=2.288 +/- 0.025 +/- 0.017 +/- 0.015 GeV, and the second moment < E-gamma(2)>=0.0328 +/- 0.0040 +/- 0.0023 +/- 0.0036 GeV2 are measured for the photon energy range 1.9 GeV < E-gamma < 2.7 GeV. They are also measured for narrower E-gamma ranges. The moments are then fit to recent theoretical calculations to extract the heavy quark expansion parameters m(b) and mu(2)(pi) and to extrapolate the partial branching fraction to E-gamma > 1.6 GeV. In addition, the direct CP asymmetry A(CP)(B -> Xs+d gamma) is measured to be -0.110 +/- 0.115(stat)+/- 0.017(syst).
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW LETTERS | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 27 October 2006 | ||||
Dates: |
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Volume: | 97 | ||||
Number: | 17 | ||||
Number of Pages: | 7 | ||||
Page Range: | - | ||||
DOI: | 10.1103/PhusRevLett.97.171803 | ||||
Publication Status: | Published |
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