First evidence for the two-body charmless baryonic decay B-0 -> p(p)over-bar

R. Aaij*, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P.A. Cartelle, A.A. Alves, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, R. Andreassen, J.E. AndrewsR.B. Appleby, O.A. Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J.J. Back, C. Baesso, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, T. Bauer, A. Bay, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, J. van den Brand

*Corresponding author for this work

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The results of a search for the rare two-body charmless baryonic decays B-0 -> p (p) over bar and B-s(0) -> p (p) over bar are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb(-1), of p p collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of B-0 -> p (p) over bar candidates with respect to background expectations is seen with a statistical significance of 3.3 standard deviations. This is the first evidence for a two-body charmless baryonic B-0 decay. No significant B-s(0) -> p (p) over bar signal is observed, leading to an improvement of three orders of magnitude over previous bounds. If the excess events are interpreted as signal, the 68.3% confidence level intervals on the branching fractions areB(B-0 -> p (p) over bar) = (1.47(-0.51)(+0.62) (-0.14) (+0.35)) x 10(-8),B(B-s(0) -> p (p) over bar) = (2.84(-1.68)(+2.03) (+0.85)(-0.18)) x 10(-8),where the first uncertainty is statistical and the second is systematic.
Original languageEnglish
Article number005
Number of pages17
JournalJournal of High Energy Physics
Issue number10
Publication statusPublished - 1 Oct 2013
Externally publishedYes


  • QCD
  • Branching fraction
  • B physics
  • Flavor physics
  • Hadron-Hadron Scattering

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