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First evidence for the two-body charmless baryonic decay B0→pp¯


LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). First evidence for the two-body charmless baryonic decay B0→pp¯. Journal of High Energy Physics, 10:5.

Abstract

The results of a search for the rare two-body charmless baryonic decays B0→pp¯ and B0s→pp¯ 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→pp¯ 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 B0s→pp¯ 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→pp¯)=1.47+0.62+0.35−0.51−0.14×10−8,B(Bs→pp¯)=2.84+2.03+0.85−1.68−0.18×10−8, where the first uncertainty is statistical and the second is systematic.

Abstract

The results of a search for the rare two-body charmless baryonic decays B0→pp¯ and B0s→pp¯ 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→pp¯ 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 B0s→pp¯ 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→pp¯)=1.47+0.62+0.35−0.51−0.14×10−8,B(Bs→pp¯)=2.84+2.03+0.85−1.68−0.18×10−8, where the first uncertainty is statistical and the second is systematic.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:06 Feb 2014 10:02
Last Modified:05 Apr 2016 17:35
Publisher:Springer
ISSN:1029-8479
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP10(2013)005

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