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Evidence for B+→J/ψpΛ‾B^+ \to J/\psi p \overline{\Lambda} and search for B0→J/ψppˉB^0 \to J/\psi p \bar{p}

Collaboration
Mar, 2003
7 pages
Published in:
  • Phys.Rev.Lett. 90 (2003) 231801
e-Print:
DOI:
Report number:
  • SLAC-PUB-9690,
  • BABAR-PUB-03-007
Experiments:
View in:
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Abstract:
We have performed a search for the decays B+→J/ψpΛˉB^+\to J/\psi p \bar{\Lambda} and B0→J/psippˉB^0\to J/psi p \bar{p} in a data set of (88.9±1.0)×106(88.9 \pm 1.0)\times 10^6 Υ(4S)\Upsilon(4S) decays collected by the BaBar experiment at the PEP-II \e^+e^- storage ring at the Stanford Linear Accelerator Center. Four charged BB candidates have been observed with an expected background of 0.21±0.140.21\pm 0.14 events. The corresponding branching fraction is 12−6+9×10−612^{+9}_{-6}\times 10^{-6}, where statistical and systematic uncertainties have been combined. The result can be interpreted as a 90% confidence level (CL) upper limit of 26×10−626 \times 10^{-6}. We also find one B0B^0 candidate, with an expected background of 0.64±0.170.64\pm 0.17 events, implying a 90% CL upper limit of 1.9×10−61.9 \times 10^{-6}.
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B: hadronic decay
  • B0: branching ratio
  • B+: branching ratio
  • upper limit
  • J/psi(3100): momentum spectrum
  • Antilambda