First evidence for the two-body charmless baryonic decay
Collaboration
17 pages
Published in:
- JHEP 10 (2013) 005
- Published: Oct, 2013
e-Print:
- 1308.0961 [hep-ex]
Report number:
- LHCB-PAPER-2013-038,
- CERN-PH-EP-2013-138
Experiments:
Citations per year
Abstract: (arXiv)
The results of a search for the rare two-body charmless baryonic decays and are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb, of collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of 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 decay. No significant 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 are {eqnarray} \cal{B}(B^0 \to p \bar{p}) & = & (1.47 \,^{+0.62}_{-0.51} \,^{+0.35}_{-0.14}) \times 10^{-8} \,, *{0.3cm} \cal{B}(B_s^0 \to p \bar{p}) & = & (2.84 \,^{+2.03}_{-1.68} \,^{+0.85}_{-0.18}) \times 10^{-8} \,, {eqnarray} where the first uncertainty is statistical and the second is systematic.Note:
- 12 pages, 3 figures
- QCD
- Branching fraction
- B physics
- Flavor physics
- Hadron-Hadron Scattering
- p p: scattering
- statistical analysis
- B+: branching ratio
- background
- LHC-B
References(0)
Figures(5)
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