In a sample of 3.02 million hadronic Z(0) decays collected by the DELPHI detector, 270 J/psi --> e(+)e(-) candidates have been selected. A search for fully reconstructed B-c(+/-) mesons has yielded one B-c(+/-) --> J/psi pi(+/-) candidate, no B-c(+/-) --> J/psi e(+/-) nu(e) candidates, and one B-c(+/-) --> J/psi pi(+)pi(-)pi(+) candidate, consistent with expected background in each channel. The following 90% confidence level upper limits ate determined: Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)) < (1.05 to 0.84) x 10(-4) and Br(Z(d) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi e(+/-) nu(e)) < (5.8 to 5.0) x 10(-5), where the ranges quoted correspond to the range of predicted B-c(+/-) lifetimes from 0.4 to 1.4 ps, and Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)pi(-)pi(+/-)) < 1.75 x 10(-4), constant over the range of predicted B-c(+/-) lifetimes. (C) 1997 Elsevier Science B.V.

Search for the B-c meson

DE LOTTO, Barbara;SCURI, Fabrizio;
1997-01-01

Abstract

In a sample of 3.02 million hadronic Z(0) decays collected by the DELPHI detector, 270 J/psi --> e(+)e(-) candidates have been selected. A search for fully reconstructed B-c(+/-) mesons has yielded one B-c(+/-) --> J/psi pi(+/-) candidate, no B-c(+/-) --> J/psi e(+/-) nu(e) candidates, and one B-c(+/-) --> J/psi pi(+)pi(-)pi(+) candidate, consistent with expected background in each channel. The following 90% confidence level upper limits ate determined: Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)) < (1.05 to 0.84) x 10(-4) and Br(Z(d) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi e(+/-) nu(e)) < (5.8 to 5.0) x 10(-5), where the ranges quoted correspond to the range of predicted B-c(+/-) lifetimes from 0.4 to 1.4 ps, and Br(Z(0) --> B-c(+/-) X) x Br(B-c(+/-) --> J/psi pi(+)pi(-)pi(+/-)) < 1.75 x 10(-4), constant over the range of predicted B-c(+/-) lifetimes. (C) 1997 Elsevier Science B.V.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/884597
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