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First Measurement of the CP-Violating Phase in B-s(0) -> phi phi Decays

Authors :
Ministerio de Economía y Competitividad (España)
Xunta de Galicia
Generalitat de Catalunya
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil)
Federal Ministry of Education and Research (Germany)
Istituto Nazionale di Fisica Nucleare
Netherlands Organization for Scientific Research
Rosatom State Atomic Energy Corporation (Russia)
Swiss National Science Foundation
LHCb Collaboration
Aaij, R.
Oyanguren, Arantza
Ruiz Valls, Pablo
Ministerio de Economía y Competitividad (España)
Xunta de Galicia
Generalitat de Catalunya
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil)
Federal Ministry of Education and Research (Germany)
Istituto Nazionale di Fisica Nucleare
Netherlands Organization for Scientific Research
Rosatom State Atomic Energy Corporation (Russia)
Swiss National Science Foundation
LHCb Collaboration
Aaij, R.
Oyanguren, Arantza
Ruiz Valls, Pablo
Publication Year :
2013

Abstract

A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B-s(0) -> phi phi decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B-s(0)-(B) over bar (0)(s) mixing and the b -> s (s) over bars gluonic penguin decay amplitude. Using a sample of pp 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-s(0) -> phi phi signal decays are obtained. The CP-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%.

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1104780399
Document Type :
Electronic Resource