We have observed bottom-charm mesons via the decay mode B-c(+/-) --> J/psi l(+/-)v in 1.8 TeV p (p) over bar collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the J/psi l mass distribution yielded 20.4(-5.5)(+6.2) events from B-c mesons. A fit to the same distribution with background alone was rejected at the level of 4.8 standard deviations. We measured the B-c(+) mass to be 6.40 +/- 0.39(stat) +/- 0.13(syst) GeV/c(2) and the B-c(+) lifetime to be 0.46(-0.16)(+0.18)(stat) +/- 0.03(syst) ps. Our measured yield (production cross section times branching ratio) for B-c(+) --> J/psi l(+)v relative to that for B+ --> J/psi K+ is 0.132(-0.037)(+0.041)(stat) +/- 0.031 (syst)(-0.020)(+0.032)(lifetime).

F., A., H., A., A., A., M. G., A., A., A., S. R., A., et al. (1998). Observation of the B-c meson in p(p)over-bar collisions at root s=1.8 TeV. PHYSICAL REVIEW LETTERS, 81(12), 2432-2437 [10.1103/PhysRevLett.81.2432].

Observation of the B-c meson in p(p)over-bar collisions at root s=1.8 TeV

PAOLETTI, RICCARDO;TURINI, NICOLA;
1998-01-01

Abstract

We have observed bottom-charm mesons via the decay mode B-c(+/-) --> J/psi l(+/-)v in 1.8 TeV p (p) over bar collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the J/psi l mass distribution yielded 20.4(-5.5)(+6.2) events from B-c mesons. A fit to the same distribution with background alone was rejected at the level of 4.8 standard deviations. We measured the B-c(+) mass to be 6.40 +/- 0.39(stat) +/- 0.13(syst) GeV/c(2) and the B-c(+) lifetime to be 0.46(-0.16)(+0.18)(stat) +/- 0.03(syst) ps. Our measured yield (production cross section times branching ratio) for B-c(+) --> J/psi l(+)v relative to that for B+ --> J/psi K+ is 0.132(-0.037)(+0.041)(stat) +/- 0.031 (syst)(-0.020)(+0.032)(lifetime).
1998
F., A., H., A., A., A., M. G., A., A., A., S. R., A., et al. (1998). Observation of the B-c meson in p(p)over-bar collisions at root s=1.8 TeV. PHYSICAL REVIEW LETTERS, 81(12), 2432-2437 [10.1103/PhysRevLett.81.2432].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/40337
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