We report the first evidence for a fully reconstructed decay mode of the B(c)(+/-) meson in the channel B(c)(+/-)-> J/psi pi(+/-), with J/psi ->mu(+)mu(-). The analysis is based on an integrated luminosity of 360 pb(-1) in p (p) over bar 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/psi pi(+/-) mass spectrum yields a B(c)(+/-) mass of 6285.7 +/- 5.3(stat)+/- 1.2(syst) MeV/c(2). The probability of a peak of this magnitude occurring by random fluctuation in the search region is estimated as 0.012%.
Evidence for the exclusive decay B(c)(+/-)-> J/psi pi(+/-) and measurement of the mass of the B(c)(+/-) meson RID C-1693-2008 RID G-1087-2011 RID E-4473-2011
DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;
2006-01-01
Abstract
We report the first evidence for a fully reconstructed decay mode of the B(c)(+/-) meson in the channel B(c)(+/-)-> J/psi pi(+/-), with J/psi ->mu(+)mu(-). The analysis is based on an integrated luminosity of 360 pb(-1) in p (p) over bar 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/psi pi(+/-) mass spectrum yields a B(c)(+/-) mass of 6285.7 +/- 5.3(stat)+/- 1.2(syst) MeV/c(2). The probability of a peak of this magnitude occurring by random fluctuation in the search region is estimated as 0.012%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
