Search for the B_c Meson in Hadronic Z^0 Decays

Details Search for the B_c Meson in Hadronic Z^0 Decays Search for the B_c Meson in Hadronic Z^0 Decays

1998-01-27

arxiv.org/abs/hep-ex/9801026v1

Phys.Lett.B420:157-168,1998

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, LaTeX, uses a4p.sty, 6 eps figures included, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)01569-4

A search for decays of the B_c meson was performed using data collected from 1990-1995 with the OPAL detector on or near the Z peak at LEP. The decay channels B_c^+ -> J/psi pi^+, B_c^+ -> J/psi a_1^+ and B_c^+ -> J/psi ell^+ nu were investigated, where ell denotes an electron or a muon. Two candidates are observed in the mode B_c^+ -> 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/c^2, which is consistent with the predicted mass of the B_c meson. One candidate event is observed in the mode B_c^+ -> J/psi ell^+ nu with an estimated background of (0.82 +/- 0.19) events. No candidate events are observed in the B_c^+ -> J/psi a_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.

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