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Evidence for the exclusive decay Bc±→J/ψπ± and measurement of the mass of the Bc± meson

AuthorsAbulencia, A.; Cuevas, Javier ; Gómez, G. ; Gómez-Ceballos, Guillelmo; Palencia, Enrique ; Piedra, Jonatan ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CDF Collaboration
Issue Date2006
PublisherAmerican Physical Society
CitationPhysical Review Letters 96: 082002 (2006)
AbstractWe report the first evidence for a fully reconstructed decay mode of the Bc± meson in the channel Bc±→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 Bc± 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%.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.96.082002
Identifiersdoi: 10.1103/PhysRevLett.96.082002
issn: 0031-9007
e-issn: 1079-7114
Appears in Collections:(IFCA) Artículos
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