A search for the Bc meson decaying into the channels J/ψπ+ and J/ψℓ+vl (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 → BcX)/Br(Z → qq̄) Br(Bc+ → J/ψπ+) < 3.6 × 10-5, Br(Z → BcX)/Br(Z → qq̄) Br(Btc → J/ψℓ+ vℓ) < 5.2 × 10-5. Another B+c → J/ψ(e+e-)μ+ vμ candidate with very low background probability, found in an independent analysis, is also described in detail.

Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Search for the Bc meson in hadronic Z decays. PHYSICS LETTERS. SECTION B, 402(1-2), 213-226 [10.1016/S0370-2693(97)00461-9].

Search for the Bc meson in hadronic Z decays

CARPINELLI, Massimo;
1997

Abstract

A search for the Bc meson decaying into the channels J/ψπ+ and J/ψℓ+vl (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 → BcX)/Br(Z → qq̄) Br(Bc+ → J/ψπ+) < 3.6 × 10-5, Br(Z → BcX)/Br(Z → qq̄) Br(Btc → J/ψℓ+ vℓ) < 5.2 × 10-5. Another B+c → J/ψ(e+e-)μ+ vμ candidate with very low background probability, found in an independent analysis, is also described in detail.
Articolo in rivista - Articolo scientifico
Physics
English
213
226
14
Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J., et al. (1997). Search for the Bc meson in hadronic Z decays. PHYSICS LETTERS. SECTION B, 402(1-2), 213-226 [10.1016/S0370-2693(97)00461-9].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390139
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