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 p-antip rest frame is measured. No significant CP asymmetry in B+ → p antip K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+ → anti-Λ(1520)(→ K+ anti-p) p near the K+ anti-p threshold and measure B(B+ → anti-Λ(1520) p) = (3.9{−0.9}{+1.0}(stat) ± 0.1(syst) ± 0.3(BF)) x 10^−7, where BF denotes the uncertainty on secondary branching fractions.

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. (2013). Studies of the Decays B+ → p anti-p h+ and Observation of B+ → anti-Λ(1520) p. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(5), 1-13 [10.1103/PhysRevD.88.052015].

Studies of the Decays B+ → p anti-p h+ and Observation of B+ → anti-Λ(1520) p

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

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 p-antip rest frame is measured. No significant CP asymmetry in B+ → p antip K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+ → anti-Λ(1520)(→ K+ anti-p) p near the K+ anti-p threshold and measure B(B+ → anti-Λ(1520) p) = (3.9{−0.9}{+1.0}(stat) ± 0.1(syst) ± 0.3(BF)) x 10^−7, where BF denotes the uncertainty on secondary branching fractions.
2013
R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, et al. (2013). Studies of the Decays B+ → p anti-p h+ and Observation of B+ → anti-Λ(1520) p. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(5), 1-13 [10.1103/PhysRevD.88.052015].
R. Aaij; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/180481
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