A measurement of the B⁰-anti-B⁰ oscillation frequency and determination of flavor-tagging efficiency using semileptonic and hadronic B⁰ decays

2000/08/23 by The BABAR Collaboration, B. Aubert, Aubert, B.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0008052

36 pages, 13 postscript figures, contributed paper to ICHEP2000

arxiv created 2000/08/23 · arxiv updated 2009/11/30

Abstract

B⁰-anti-B⁰ flavor oscillations are studied in e⁺e^- annihilation data collected with the BABAR detector at center-of-mass energies near the Y(4S) resonance. One B is reconstructed in a hadronic or semileptonic decay mode, and the flavor of the other B in the event is determined with a tagging algorithm that exploits the relation between the flavor of the heavy quark and the charges of its decay products. Tagging performance is characterized by an efficiency e_i and a probability for mis-identification, w_i, for each tagging category. We report a determination of the wrong-tag probabilities, w_i, and a preliminary result for the time-dependent B⁰-anti-B⁰ oscillation frequency, Delta_md = 0.512+/-0.017+/-0.022 hbar-ps^-1.

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