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oai:recercat.cat:2445/1330882025-12-05T16:54:29Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Badalov, Alexey author Calvo Gómez, Míriam author Garrido Beltrán, Lluís author Gascón Fora, David author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Marin Benito, Carla author Picatoste Olloqui, Eduardo author Rives Molina, Vicente José author Ruiz, Hugo (Ruiz Pérez) author Vilasis-Cardona, Xavier author LHCb Collaboration author 2019-05-13T14:23:01Z 2019-05-13T14:23:01Z 2014-09-29 2019-05-13T14:23:01Z Three-body B + → p ¯ p K + and B + → p ¯ p π + decays are studied using a data sample corresponding to an integrated luminosity of 3.0     fb − 1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of C P violation in the B + → p ¯ p K + decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the p ¯ p rest frame yield A FB ( p ¯ p K + , m p ¯ p < 2.85     GeV / c 2 ) = 0.495 ± 0.012     ( stat ) ± 0.007     ( syst ) and A FB ( p ¯ p π + , m p ¯ p < 2.85     GeV / c 2 ) = − 0.409 ± 0.033     ( stat ) ± 0.006     ( syst ) . In addition, the branching fraction of the decay B + → ¯ Λ ( 1520 ) p is measured to be B ( B + → ¯ Λ ( 1520 ) p ) = ( 3.15 ± 0.48     ( stat ) ± 0.07     ( syst ) ± 0.26     ( BF ) ) × 1 0 − 7 , where BF denotes the uncertainty on secondary branching fractions. Física de partícules Experiments Particle physics Experiments Evidence for CP Violation in B+→p¯pK+ Decays