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Languages : en
Pages : 149
Book Description
A search for decays of the Bc meson was performed using data collected from 1990--1995 with the OPAL detector on or near the Z0 peak at LEP. The decay channels B$+\atop{c}$ 2!J/[Psi][pi]+, B$+\atop{c}$ 2!J/[Psi]a1 and B$+\atop{c}$ 2!J/[Psi]l+v were investigated, where l denotes an electron or a muon. Two candidates are observed in the mode B$+\atop{c}$ 2!J/[Psi][pi]+, with an estimated background of (0.63 ± 0.20) events. The weighted mean of the masses of the two candidates is (6.32 ± 0.06) GeV/c2, which is consistent with the predicted mass of the Bc meson. One candidate event is observed in the mode B$+\atop{c}$ 2!J/[Psi]l+v, with an estimated background of (0.82 ± 0.19) events. No candidate events are observed in the B$+\atop{c}$ 2!J/[Psi]a$+\atop{1}$ decay mode, with an estimated background of (1.10 ± 0.22) events. Upper bounds at the 90% confidence level are set on the production rates for these processes.
