A search for time-integrated CP violation in D0→h-h+ (h=K, π) decays is presented using 0.62 fb-1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D*+→D0π+ and D*-→D̅ 0π- decay chains. The difference in CP asymmetry between D0→K-K+ and D0→π-π+, ΔACP≡ACP(K-K+)-ACP(π-π+), is measured to be [-0.82±0.21(stat)±0.11(syst)]%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.
Evidence for CP Violation in Time-Integrated D-0 -> h(-)h(+) decay rates
AURIEMMA, Giulio;SATRIANO, Celestina;
2012-01-01
Abstract
A search for time-integrated CP violation in D0→h-h+ (h=K, π) decays is presented using 0.62 fb-1 of data collected by LHCb in 2011. The flavor of the charm meson is determined by the charge of the slow pion in the D*+→D0π+ and D*-→D̅ 0π- decay chains. The difference in CP asymmetry between D0→K-K+ and D0→π-π+, ΔACP≡ACP(K-K+)-ACP(π-π+), is measured to be [-0.82±0.21(stat)±0.11(syst)]%. This differs from the hypothesis of CP conservation by 3.5 standard deviations.File in questo prodotto:
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