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Title: First Observation of CP Violation in the Decays of B0s Mesons
Author: Abellan Beteta, Carlos
Calvo Gómez, Míriam
Camboni, Alessandro
Comerma Montells, Albert
Garrido Beltrán, Lluís
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
López Asamar, Elias
Oyanguren Campos, Arantza de
Pérez-Calero Yzquierdo, Antonio
Picatoste Olloqui, Eduardo
Potterat, Cédric
Rives Molina, Vicente José
Ruiz, Hugo (Ruiz Pérez)
Ruiz Valls, Pablo
Vázquez Gómez, Ricard
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Particle physics
Issue Date: 30-May-2013
Publisher: American Physical Society
Abstract: Using p p collision data corresponding to an integrated luminosity of 1.0     fb − 1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct C P violation in B 0 s → K − π + decays, A C P ( B 0 s → K − π + ) = 0.27 ± 0.04   ( stat ) ± 0.01   ( syst ) , with significance exceeding 5 standard deviations. This is the first observation of C P violation in the decays of B 0 s mesons. Furthermore, we provide an improved determination of direct C P violation in B 0 → K + π − decays, A C P ( B 0 → K + π − ) = − 0.080 ± 0.007   ( stat ) ± 0.003   ( syst ) , which is the most precise measurement of this quantity to date.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2013, vol. 110, num. 22, p. 221601
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ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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