The CP violation observables S and C in the decay channel B^0→D^+D^- are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 3  fb^-1. The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: S=-0.54_-0.16^+0.17(stat)±0.05(syst), C=0.26_-0.17^+0.18(stat)±0.02(syst). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of Δϕ=-0.16_-0.21^+0.19  rad.

Measurement of CP Violation in B^0→D^+D^- Decays

VELTRI, MICHELE;
2016-01-01

Abstract

The CP violation observables S and C in the decay channel B^0→D^+D^- are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 3  fb^-1. The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: S=-0.54_-0.16^+0.17(stat)±0.05(syst), C=0.26_-0.17^+0.18(stat)±0.02(syst). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of Δϕ=-0.16_-0.21^+0.19  rad.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2642810
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