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Title: | Determination of the Sign of the Decay Width Difference in the B0s System |
Author: | Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Domingo Bonal, Francesc Garrido Beltrán, Lluís Gascón Fora, David Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Musy, Marco Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Pie Valls, B. (Blai) Potterat, Cédric Puig Navarro, Albert Roselló, M. Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 11-Jun-2012 |
Publisher: | American Physical Society |
Abstract: | The interference between the K + K − S -wave and P -wave amplitudes in B 0 s → J / ψ K + K − decays with the K + K − pairs in the region around the ϕ ( 1020 ) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K + K − invariant mass. Combined with the results from our C P asymmetry measurement in B 0 s → J / ψ ϕ decays, we conclude that the B 0 s mass eigenstate that is almost C P = + 1 is lighter and decays faster than the mass eigenstate that is almost C P = − 1 . This determines the sign of the decay width difference Δ Γ s ≡ Γ L − Γ H to be positive. Our result also resolves the ambiguity in the past measurements of the C P violating phase ϕ s to be close to zero rather than π . These conclusions are in agreement with the standard model expectations. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.108.241801 |
It is part of: | Physical Review Letters, 2012, vol. 108, num. 24, p. 241801 |
URI: | http://hdl.handle.net/2445/133690 |
Related resource: | https://doi.org/10.1103/PhysRevLett.108.241801 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Física de la Matèria Condensada) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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