Aubert, B;
Barate, R;
Bona, M;
Boutigny, D;
Couderc, F;
Karyotakis, Y;
Lees, JP;
... BaBar Collaboration; + view all
(2006)
Measurement of the branching fraction and photon energy moments of B -> X-s gamma and A(CP)(B -> Xs+d gamma).
PHYS REV LETT
, 97
(17)
, Article 171803. 10.1103/PhusRevLett.97.171803.
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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).
| Type: | Article |
|---|---|
| Title: | Measurement of the branching fraction and photon energy moments of B -> X-s gamma and A(CP)(B -> Xs+d gamma) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhusRevLett.97.171803 |
| Publisher version: | http://dx.doi.org/10.1103/PhusRevLett.97.171803 |
| Language: | English |
| Additional information: | © 2006 The American Physical Society |
| Keywords: | RADIATIVE B-DECAYS, CP VIOLATION, ASYMMETRY, PHYSICS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1303808 |
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