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First evidence for the two-body charmless baryonic decay B0→ppˉ
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LHCb Collaboration (Including: Back, J. J., Craik, Daniel, Dossett, D., Gershon, T. J., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Wallace, Charlotte, Whitehead, M. (Mark) and Williams, M. P.). (2013) First evidence for the two-body charmless baryonic decay B0→ppˉ. Journal of High Energy Physics, Volume 2013 (Number 10). Article number 5. doi:10.1007/JHEP10(2013)005 ISSN 1029-8479.
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WRAP_LCHb_art%253A10.1007%252FJHEP10%25282013%2529005.pdf - Published Version Available under License Creative Commons Attribution. Download (1019Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/JHEP10(2013)005
Abstract
The results of a search for the rare two-body charmless baryonic decays B0→ppˉ and B0s→ppˉ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb−1, of pp collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of B0→ppˉ 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 B0 decay. No significant B0s→ppˉ 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
B(B0→ppˉ)B(B0s→ppˉ)==(1.47+0.62−0.51+0.35−0.14)×10−8,(2.84+2.03−1.68+0.85−0.18)×10−8,
where the first uncertainty is statistical and the second is systematic.
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