We have performed a search for the decays B+→J/ψpΛ̅ and B0→J/ψpp̅ in a data set of (88.9±1.0)×106 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/ψpΛ¯ and Search for B0→J/ψpp¯

CONTRI, ROBERTO;LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;ROBUTTI, ENRICO;SANTRONI, ALBERTO;TOSI, SILVANO;
2003-01-01

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)×106 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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/384231
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