Abstract
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 language | English |
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Article number | 005 |
Number of pages | 17 |
Journal | Journal of High Energy Physics |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Oct 2013 |
Externally published | Yes |
Keywords
- QCD
- Branching fraction
- B physics
- Flavor physics
- Hadron-Hadron Scattering
- EXCLUSIVE DECAYS
- MESONS
- SEARCH