# Determination of the Branching Fraction for Inclusive Decays $B \rightarrow X_{s}\gamma$

Abstract : We present a preliminary determination of the inclusive branching fraction for the rare radiative penguin transition B -> X_{s} gamma. The measurement is based on a data sample of 60 million BB pairs collected between 1999 and 2001 with the BaBar detector at the PEPII asymmetric-energy e+e- B Factory at SLAC. We study events containing a high-energy photon from one B (or Bbar) decay and a tagging primary lepton from the decay of the other B meson. By this means, we are able to reduce a significant component of the background without introduction of model dependent uncertainties in the event selection efficiency. We determine the branching fraction BR(B->X_{s} gamma)=3.88 +-0.36(stat.)+-0.37(sys.) +0.43-0.23(model.)x10^{-4}, which is consistent with Standard Model predictions and provides a constraint on possible new physics contributions to the electromagnetic penguin amplitude in B decays.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00012418
Contributor : Claudine Bombar <>
Submitted on : Tuesday, January 14, 2003 - 2:10:35 PM
Last modification on : Wednesday, January 6, 2021 - 6:22:02 PM

### Citation

B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Determination of the Branching Fraction for Inclusive Decays $B \rightarrow X_{s}\gamma$. International Conference on High Energy Physics 31 ICHEP 2002, Jul 2002, Amsterdam, Netherlands. pp.1-16. ⟨in2p3-00012418⟩

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