Search for the $B_c$ meson in hadronic $Z$ decays

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 c X Br(Z→q q ̄ Br(B c + → J ψπ + ) <3.6×10 −5 , Br(Z→B c X 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.

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
search for: B/c
B/c: hadronic decay
B/c: semileptonic decay
branching ratio: upper limit
mass spectrum
ALEPH

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Search for the BcB_cBc​ meson in hadronic ZZZ decays

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Search for the $B_c$ meson in hadronic $Z$ decays