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 1.9×10-6I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.