Measurement of the branching fraction and photon energy moments of $B \to X_{s} \gamma$ and $A_{CP} \, (B \to X_{s+d} \, \gamma)$ - INSPIRE

DataBETA

Measurement of the branching fraction and photon energy moments of $B \to X_{s} \gamma$ and $A_{CP} \, (B \to X_{s+d} \, \gamma)$

BaBar

Collaboration

Jul, 2006

8 pages

Published in:

Phys.Rev.Lett. 97 (2006) 171803

e-Print:

hep-ex/0607071 [hep-ex]

DOI:

10.1103/PhysRevLett.97.171803

PDG:

{{\mathit B}}

\rightarrow

{{\overline{\mathit b}}}

\rightarrow

{{\overline{\mathit s}}}{{\mathit \gamma}}

Report number:

SLAC-PUB-12002,
BABAR-PUB-06-037

Experiments:

SLAC-PEP2-BABAR

View in:

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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 88.5 million e+e- -> Upsilon(4S) -> BBbar decays collected by the BaBar experiment at SLAC. The partial branching fraction, Delta B(B -> X_s gamma)=(3.67 +- 0.29(stat.) +- 0.34(sys.) +- 0.29(model)) times 10^-4, the first moment =2.288 +- 0.025 +- 0.017 +- 0.015 GeV and the second moment - ^2 =0.0328 +- 0.0040 +- 0.0023 +- 0.0036 GeV^2 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_pi^2, and to extrapolate the partial branching fraction to E_gamma>1.6 GeV. In addition, the direct CP asymmetry A_CP(B -> X_(s+d) gamma) is measured to be -0.110 +- 0.115(stat.) +- 0.017(sys.).

Note:

8 pages 1 figure, submitted to PRL Report-no: BaBar Pub 06/037 SLAC-PUB 12002

13.20.He
11.30.Er
12.15.Hh
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: radiative decay
quark: strangeness
photon: energy spectrum

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