Discovery of the B{sub C} meson
We report on the first observation of the bottom-charm mesons B{sub c} through the decay mode B{sub c}{sup {+-}} {yields} J/{psi}l{sup {+-}}{nu} in 1.8 TeV p{anti p} collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the observed J/{psi}l mass distribution yielded 20.4{sup +6.2}{sub -5.5} events from B{sub 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{sub c}{sup +} mass to be 6.40{+-}0.39{+-}0.13 GeV/c{sup 2} and the B{sub c}{sup +} lifetime to be 0.46{sup 0.18}{sub -0.16}(stat.){+-}0.03(syst.) ps. The measured production cross section times branching ratio for B{sub c}{sup +} {yields} J/{psi}l{sup +}{nu} relative to that for B{sup +} {yields} J/{psi}K{sup +} is 0.132{sup 0.041}{sub -0.037}(stat.){+-}0.031(syst.){sup +0.032}{sub -0.020}(lifetime).
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 672857
- Report Number(s):
- FNAL/C-98/209-E; CONF-9803100-; R&D Project: E775; ON: DE98057346; BR: KA HEP; TRN: 99:000173
- Resource Relation:
- Conference: 12. Les Rencontres de Physique de la Vallee D`Aosta: results and perspectives in particle physics, La Thuile (Italy), 1-7 Mar 1998; Other Information: PBD: Jul 1998
- Country of Publication:
- United States
- Language:
- English
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