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http://hdl.handle.net/2445/133088
Title: | Evidence for CP Violation in B+→p¯pK+ Decays |
Author: | Badalov, Alexey Calvo Gómez, Míriam Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 29-Sep-2014 |
Publisher: | American Physical Society |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.113.141801 |
It is part of: | Physical Review Letters, 2014, vol. 113, num. 14, p. 141801 |
URI: | http://hdl.handle.net/2445/133088 |
Related resource: | https://doi.org/10.1103/PhysRevLett.113.141801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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