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Observation of the Bc Meson at CDF.

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We report on the observation of bottom-charm mesons via 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 J/[psi]l mass distribution yielded 20.4[sup +6.2][sub -5.5] events from B[sub c] mesons. We measured the B[sub c][sup +] mass to be 6.40[+-]0.39(stat.)[+-]0.13(syst.)GeV/c 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).