Abstract
A search for the B c meson decaying into the channels J ψπ + and J ψℓ +ν ℓ (ℓ = e or μ) is performed in a sample of 3.9 million hadronic Z decays collected by the ALEPH detector. This search results in the observation of 0 and 2 candidates in each of these channels, respectively, while 0.44 and 0.81 background events are expected. The following 90% confidence level upper limits are derived: Br(Z→B cX Br(Z→q q ̄ Br(B c +→ J ψπ +) <3.6×10 −5, Br(Z→B cX Br(Z→q q ̄ Br(B c +→ J ψl +vl )<5.2×10 −5 Another B c + → J ψ(e +e −)μ +ν μ candidate with very low background probability, found in an independent analysis, is also described in detail.
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