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Evidence for the Exclusive Decay Bc± -> J/ψπ± and Measurement of the Mass of the Bc± Meson

CollaborationWith : Campanelli, Mario / Clark, Allan Geoffrey / D'Onofrio, Monica / Donega, Mauro / Lister, Alison / Liu, Yanwen / Vallecorsa, Sofia / Wu, Xin
Published in Physical Review Letters. 2006, vol. 96, no. 08, p. 082002
Abstract We report the first evidence for a fully reconstructed decay mode of the B±c meson in the channel B±c→J/ψπ±, with J/ψ→μ+μ−. The analysis is based on an integrated luminosity of 360  pb−1 in pp collisions at 1.96 TeV center of mass energy collected by the Collider Detector at Fermilab. We observe 14.6±4.6 signal events with a background of 7.1±0.9 events, and a fit to the J/ψπ± mass spectrum yields a B±c mass of 6285.7±5.3(stat)±1.2(syst)  MeV/c2. The probability of a peak of this magnitude occurring by random fluctuation in the search region is estimated as 0.012%.
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CDF COLLABORATION. Evidence for the Exclusive Decay Bc± -> J/ψπ± and Measurement of the Mass of the Bc± Meson. In: Physical Review Letters, 2006, vol. 96, n° 08, p. 082002. https://archive-ouverte.unige.ch/unige:38324

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Deposited on : 2014-06-30

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