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Title: First Measurement of the CP-Violating Phase in B0s→ϕϕ 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
Particle physics
Issue Date: 12-Jun-2013
Publisher: American Physical Society
Abstract: A first flavor-tagged measurement of the time-dependent C P -violating asymmetry in B 0 s → ϕ ϕ decays is presented. In this decay channel, the C P -violating weak phase arises due to C P violation in the interference between B 0 s − ¯¯¯ B 0 s mixing and the b → s ¯ s s gluonic penguin decay amplitude. Using a sample of p p collision data corresponding to an integrated luminosity of 1.0     fb − 1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B 0 s → ϕ ϕ signal decays are obtained. The C P -violating phase is measured to be in the interval [ − 2.46 , − 0.76 ]     rad at a 68% confidence level. The p value of the standard model prediction is 16%.
Note: Reproducció del document publicat a:
It is part of: Physical Review Letters, 2013, vol. 110, num. 24, p. 241802
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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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