Dynamics and direct CP violation in three-body charmless decays of charged B mesons to a proton, an antiproton and a light meson (pion or kaon) are studied using data, corresponding to an integrated luminosity of 1.0  fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Production spectra are determined as a function of Dalitz-plot and helicity variables. The forward-backward asymmetry of the light meson in the pp⎯⎯ rest frame is measured. No significant CP asymmetry in B+→pp⎯⎯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ⎯⎯⎯(1520)(→K+p⎯⎯)p near the K+p⎯⎯ threshold and measure ℬ(B+→Λ⎯⎯⎯(1520)p)=(3.9+1.0−0.9(stat)±0.1(syst)±0.3(BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

Studies of the decays B+ -> p(p)over-barph(+) and observation of B+ -> (Lambda)over-bar(1520)p

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2013-01-01

Abstract

Dynamics and direct CP violation in three-body charmless decays of charged B mesons to a proton, an antiproton and a light meson (pion or kaon) are studied using data, corresponding to an integrated luminosity of 1.0  fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Production spectra are determined as a function of Dalitz-plot and helicity variables. The forward-backward asymmetry of the light meson in the pp⎯⎯ rest frame is measured. No significant CP asymmetry in B+→pp⎯⎯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ⎯⎯⎯(1520)(→K+p⎯⎯)p near the K+p⎯⎯ threshold and measure ℬ(B+→Λ⎯⎯⎯(1520)p)=(3.9+1.0−0.9(stat)±0.1(syst)±0.3(BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/696038
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