The results of a search for the rare two-body charmless baryonic decays B0 → pp̄ and B0s → pp̄ 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 → pp̄ 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 → pp̄ 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 (Equation) where the first uncertainty is statistical and the second is systematic.

Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). First evidence for the two-body charmless baryonic decay B0 → pp̄. JOURNAL OF HIGH ENERGY PHYSICS, 2013(10) [10.1007/JHEP10(2013)005].

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

CALVI, MARTA;GOTTI, CLAUDIO;Martinelli, M;
2013

Abstract

The results of a search for the rare two-body charmless baryonic decays B0 → pp̄ and B0s → pp̄ 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 → pp̄ 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 → pp̄ 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 (Equation) where the first uncertainty is statistical and the second is systematic.
Articolo in rivista - Articolo scientifico
B physics; Branching fraction; Flavor physics; Hadron-Hadron scattering; QCD; Nuclear and High Energy Physics
English
2013
2013
10
005
none
Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., et al. (2013). First evidence for the two-body charmless baryonic decay B0 → pp̄. JOURNAL OF HIGH ENERGY PHYSICS, 2013(10) [10.1007/JHEP10(2013)005].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/66849
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