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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
Particle physics
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:
It is part of: Physical Review Letters, 2012, vol. 108, num. 24, p. 241801
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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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