A search for the B-c meson decaying into the channels J/psi pi(+) and J/psi l(+)nu(l) (l = e or mu) 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) over bar)x BR(B-c(+) --> J/psi pi(+)) < 3.6 x 10(-5), (Br(Z --> B-cX)/Br(Z-->q (q) over bar))xBr(B-c(+) --> J/psi l(+)nu) < 5.2 x 10(-5). Another B-c(+) --> J/psi(e(+)e(-))mu(+)nu(mu) candidate with very low background probability, found in an independent analysis, is also described in detail.

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1997). Search for B-c meson in hadronic Z decays. PHYSICS LETTERS. SECTION B, 402(1-2), 213-226 [10.1016/S0370-2693(97)00461-9].

Search for B-c meson in hadronic Z decays

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1997-01-01

Abstract

A search for the B-c meson decaying into the channels J/psi pi(+) and J/psi l(+)nu(l) (l = e or mu) 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) over bar)x BR(B-c(+) --> J/psi pi(+)) < 3.6 x 10(-5), (Br(Z --> B-cX)/Br(Z-->q (q) over bar))xBr(B-c(+) --> J/psi l(+)nu) < 5.2 x 10(-5). Another B-c(+) --> J/psi(e(+)e(-))mu(+)nu(mu) candidate with very low background probability, found in an independent analysis, is also described in detail.
1997
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1997). Search for B-c 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/11365/38317
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