We have performed a search for the decays B+→J/ψpΛ̅ and B0→J/ψpp̅ in a data set of (88.9±1.0)×10^6 Υ(4S) decays collected by the BABAR experiment at the PEP-II e+e- storage ring at the Stanford Linear Accelerator Center. Four charged B candidates have been observed with an expected background of 0.21±0.14 events. The corresponding branching fraction is (12-6+9)×10-6, where statistical and systematic uncertainties have been combined. The result can be interpreted as a 90% confidence level (C.L.) upper limit of 26×10-6. We also find one B0 candidate, with an expected background of 0.64±0.17 events, implying a 90% C.L. upper limit of 1.9×10-6.
Evidence for B+→J/ψpΛ̅ and Search for B0→J/ψpp̅
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;SIMI, GABRIELE;
2003
Abstract
We have performed a search for the decays B+→J/ψpΛ̅ and B0→J/ψpp̅ in a data set of (88.9±1.0)×10^6 Υ(4S) decays collected by the BABAR experiment at the PEP-II e+e- storage ring at the Stanford Linear Accelerator Center. Four charged B candidates have been observed with an expected background of 0.21±0.14 events. The corresponding branching fraction is (12-6+9)×10-6, where statistical and systematic uncertainties have been combined. The result can be interpreted as a 90% confidence level (C.L.) upper limit of 26×10-6. We also find one B0 candidate, with an expected background of 0.64±0.17 events, implying a 90% C.L. upper limit of 1.9×10-6.Pubblicazioni consigliate
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