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Search for the Bc meson in hadronic Z0 decays

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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  • OPAL Collaboration
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<mark>Journal publication date</mark>19/02/1998
<mark>Journal</mark>Physics Letters B
Issue number1-2
Volume420
Number of pages12
Pages (from-to)157-168
Publication StatusPublished
<mark>Original language</mark>English

Abstract

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 Bc+→J/ψπ+, Bc+→J/ψa1+ and Bc+→J/ψℓ+ν were investigated, where ℓ denotes an electron or a muon. Two candidates are observed in the mode Bc+→J/ψπ+, 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 Bc+→J/ψℓ+ν, with an estimated background of (0.82±0.19) events. No candidate events are observed in the Bc+→J/ψa1+ 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.