Measurement of the CP violation parameter AΓ in D0→K+K− and D0→π+π− decays

Abstract : Asymmetries in the time-dependent rates of D0→K+K− and D0→π+π− decays are measured in a pp collision data sample collected with the LHCb detector during LHC Run~1, corresponding to an integrated luminosity of 3fb−1. The asymmetries in effective decay widths between D0 and D¯¯¯¯0 decays, sensitive to indirect CP violation, are measured to be AΓ(K+K−)=(−0.30±0.32±0.10)×10−3 and AΓ(π+π−)=(0.46±0.58±0.12)×10−3, where the first uncertainty is statistical and the second systematic. These measurements show no evidence for CP violation and improve on the precision of the previous best measurements by nearly a factor of two.
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Physical Review Letters, American Physical Society, 2017, 118, pp.261803. 〈https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.261803〉. 〈10.1103/PhysRevLett.118.261803〉
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Soumis le : mercredi 22 février 2017 - 11:27:23
Dernière modification le : jeudi 18 janvier 2018 - 01:50:38

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the CP violation parameter AΓ in D0→K+K− and D0→π+π− decays. Physical Review Letters, American Physical Society, 2017, 118, pp.261803. 〈https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.261803〉. 〈10.1103/PhysRevLett.118.261803〉. 〈in2p3-01473878〉

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