Observation of the Bc meson in pp¯ collisions at √s = 1.8 TeV
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We have observed bottom-charm mesons via the decay mode B±c → J/ψl±ν in 1.8 TeV pp¯ collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the J/ψl mass distribution yielded 20.4+6.2-5.5 events from Bc 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/c2 and the B+c lifetime to be 0.46+0.18-0.16(stat) ± 0.03(syst)ps. Our measured yield (production cross section times branching ratio) for B±c → J/ψl+ν relative to that for B+ → J/ψK+ is 0.132+0.041-0.037(stat) ± 0.031(syst)+0.032-0.020(lifetime). © 1998 The American Physical Society.
author list (cited authors)
Abe, F., Akimoto, H., Akopian, A., Albrow, M. G., Amadon, A., Amendolia, S. R., ... Demortier, L.