Measurements of Indirect CP Asymmetries in D0→K−K+ and D0→π−π+ Decays

A study of indirect C P violation in D 0 mesons through the determination of the parameter A Γ is presented using a data sample of p p collisions, corresponding to an integrated luminosity of 1.0     fb − 1 , collected with the LHCb detector and recorded at the center-of-mass energy of 7 TeV at the...

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Detalhes bibliográficos
Autores: Badalov, Alexey, Calvo Gómez, Míriam, Camboni, Alessandro, Comerma Montells, Albert, Garrido Beltrán, Lluís, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, Oyanguren Campos, Arantza de, Pérez-Calero Yzquierdo, Antonio, Picatoste Olloqui, Eduardo, Potterat, Cédric, Rives Molina, Vicente José, Ruiz, Hugo (Ruiz Pérez), Ruiz Valls, Pablo, Vilasis-Cardona, Xavier, LHCb Collaboration
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/133201
Acesso em linha:https://hdl.handle.net/2445/133201
Access Level:acceso abierto
Palavra-chave:Física de partícules
Experiments
Particle physics
Descrição
Resumo:A study of indirect C P violation in D 0 mesons through the determination of the parameter A Γ is presented using a data sample of p p collisions, corresponding to an integrated luminosity of 1.0     fb − 1 , collected with the LHCb detector and recorded at the center-of-mass energy of 7 TeV at the LHC. The parameter A Γ is the asymmetry of the effective lifetimes measured in decays of D 0 and ¯ D 0 mesons to the C P eigenstates K − K + and π − π + . Fits to the data sample yield A Γ ( K K ) = ( − 0.35 ± 0.62 ± 0.12 ) × 10 − 3 and A Γ ( π π ) = ( 0.33 ± 1.06 ± 0.14 ) × 10 − 3 , where the first uncertainties are statistical and the second systematic. The results represent the world's best measurements of these quantities. They show no difference in A Γ between the two final states and no indication of C P violation.

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