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Title: | Measurement of CP violation and the B0s meson decay width difference with B0s → J/ψK+K− and B0s → J/ψπ+π− decays |
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 Experiments Violació CP (Física nuclear) Particle physics Experiments CP violation (Nuclear physics) |
Issue Date: | 21-Jun-2013 |
Publisher: | American Physical Society |
Abstract: | The time-dependent C P asymmetry in B 0 s → J / ψ K + K − decays is measured using p p collision data at √ s = 7 TeV , corresponding to an integrated luminosity of 1.0 fb − 1 , collected with the LHCb detector. The decay-time distribution is characterized by the decay widths Γ L and Γ H of the light and heavy mass eigenstates of the B 0 s − ¯¯¯ B 0 s system and by a C P -violating phase ϕ s . In a sample of 27 617 B 0 s → J / ψ K + K − decays, where the dominant contribution comes from B 0 s → J / ψ ϕ decays, these parameters are measured to be ϕ s = 0.07 ± 0.09 ( stat ) ± 0.01 ( syst ) rad , Γ s ≡ ( Γ L + Γ H ) / 2 = 0.663 ± 0.005 ( stat ) ± 0.006 ( syst ) ps − 1 , and Δ Γ s ≡ Γ L − Γ H = 0.100 ± 0.016 ( stat ) ± 0.003 ( syst ) ps − 1 , corresponding to the single most precise determination of ϕ s , Δ Γ s , and Γ s . The result of performing a combined analysis with B 0 s → J / ψ π + π − decays gives ϕ s = 0.01 ± 0.07 ( stat ) ± 0.01 ( syst ) rad , Γ s = 0.661 ± 0.004 ( stat ) ± 0.006 ( syst ) ps − 1 , and Δ Γ s = 0.106 ± 0.011 ( stat ) ± 0.007 ( syst ) ps − 1 . All measurements are in agreement with the Standard Model predictions. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.87.112010 |
It is part of: | Physical Review D, 2013, vol. 87, num. 11, p. 112010 |
URI: | http://hdl.handle.net/2445/131840 |
Related resource: | https://doi.org/10.1103/PhysRevD.87.112010 |
ISSN: | 1550-7998 |
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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