Measurement of the $B \to X_s \gamma$ branching fraction and photon energy spectrum using the recoil method - INSPIRE

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Measurement of the $B \to X_s \gamma$ branching fraction and photon energy spectrum using the recoil method

BaBar

Collaboration

Nov, 2007

9 pages

Published in:

Phys.Rev.D 77 (2008) 051103

e-Print:

0711.4889 [hep-ex]

DOI:

10.1103/PhysRevD.77.051103

PDG:

{{\mathit B}}

\rightarrow

{{\overline{\mathit b}}}

\rightarrow

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

Report number:

SLAC-PUB-13021,
BABAR-PUB-07-067

Experiments:

SLAC-PEP2-BABAR

View in:

reference search172 citations

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Abstract: (arXiv)

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 BB 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 BR(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_{pi}^2. In addition, measurements of the direct CP asymmetry and isospin asymmetry are presented.

Note:

9 pages, 2 postscript figures, updated references for v2

13.20.He
13.30.Ce
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: radiative decay
photon: energy spectrum
energy spectrum: moment
B: branching ratio

References(28)

Figures(0)

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