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Measurement of mixing and CP violation parameters in two-body charm decays

Abstract : A study of mixing and indirect CP violation in D0 mesons through the determination of the parameters y_CP and A_\Gamma\ is presented. The parameter y_CP is the deviation from unity of the ratio of effective lifetimes measured in D0 decays to the CP eigenstate K+K- with respect to decays to the Cabibbo favoured mode K-\pi+. The result measured using data collected by LHCb in 2010, corresponding to an integrated luminosity of 29 pb^-1, is y_CP = (5.5+/-6.3_{stat}+/-4.1_{syst}) x 10^-3. The parameter A_\Gamma\ is the asymmetry of effective lifetimes measured in decays of D0 and anti-D0 mesons to K+K-. The result is A_\Gamma\ = (-5.9+/-5.9_{stat}+/-2.1_{syst}) x 10^-3. A data-driven technique is used to correct for lifetime-biasing effects.
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http://hal.in2p3.fr/in2p3-00697082
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Submitted on : Monday, May 14, 2012 - 3:02:20 PM
Last modification on : Friday, November 20, 2020 - 3:30:14 PM

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R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. Measurement of mixing and CP violation parameters in two-body charm decays. Journal of High Energy Physics, Springer, 2012, 4, pp.129. ⟨10.1007/JHEP04(2012)129⟩. ⟨in2p3-00697082⟩

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