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A Measurement of the Semileptonic Branching Fraction of the B_s Meson
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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.
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GRAUGÉS POUS, Eugeni, GARRA TICÓ, Jordi and BABAR Collaboration. A Measurement of the Semileptonic Branching Fraction of the B_s Meson. Physical Review D. 2012. Vol. 85, num. 1, pags. 011101. ISSN 1550-7998. [consulted: 12 of October of 2026]. Available at: https://hdl.handle.net/2445/124811