# Measurement of the Semileptonic Branching Fraction of the $B_s$ Meson

Abstract : We report a measurement of the inclusive semileptonic branching fraction of the B_s meson using data collected with the BaBar detector in the center-of-mass (CM) energy region above the Upsilon(4S) resonance. We use the inclusive yield of phi mesons and the phi yield in association with a high-momentum lepton to perform a simultaneous measurement of the semileptonic branching fraction and the production rate of B_s mesons relative to all B mesons as a function of CM energy. The inclusive semileptonic branching fraction of the B_s meson is determined to be B(B_s to l nu X)=9.5 (+2.5/-2.0)(stat)(+1.1/-1.9)(syst)%, where l indicates the average of e and mu.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00636322
Contributor : Swarna Bassava <>
Submitted on : Thursday, October 27, 2011 - 11:49:13 AM
Last modification on : Tuesday, May 14, 2019 - 10:47:09 AM

### Citation

J.P. Lees, V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, et al.. Measurement of the Semileptonic Branching Fraction of the $B_s$ Meson. Physical Review D, American Physical Society, 2012, 85, pp.011101. ⟨10.1103/PhysRevD.85.011101⟩. ⟨in2p3-00636322⟩

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