A search for the rare two-body charmless baryonic decay B+ -> p (Lambda) over bar is performed with pp collision data corresponding to an integrated luminosity of 3 fb(-1) collected by the LHCb experiment at centre-of-mass energies of 7, 8 TeV. An excess of B+ -> p (Lambda) over bar candidates with respect to background expectations is seen with a statistical significance of 4.1 standard deviations, constitutes the first evidence for this decay. The branching fraction measured using the B+ -> K-S(0)pi(+) decay for normalisation is B(B+ -> p (Lambda) over bar) = (2.4(-0.8)(+)(+1.0) +/- 0.3) x 10(-7), where the first uncertainty is statistical, the second systematic.

Evidence for the two-body charmless baryonic decay B+ -> p(Lambda)over-bar

Dettori F.;Lai A.;Manca G.;Oldeman R.;Saitta B.;
2017-01-01

Abstract

A search for the rare two-body charmless baryonic decay B+ -> p (Lambda) over bar is performed with pp collision data corresponding to an integrated luminosity of 3 fb(-1) collected by the LHCb experiment at centre-of-mass energies of 7, 8 TeV. An excess of B+ -> p (Lambda) over bar candidates with respect to background expectations is seen with a statistical significance of 4.1 standard deviations, constitutes the first evidence for this decay. The branching fraction measured using the B+ -> K-S(0)pi(+) decay for normalisation is B(B+ -> p (Lambda) over bar) = (2.4(-0.8)(+)(+1.0) +/- 0.3) x 10(-7), where the first uncertainty is statistical, the second systematic.
2017
B physics; Branching fraction; Flavor physics; Hadron-Hadron scattering (experiments)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/240161
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