# Measurement of indirect $CP$-violating asymmetries in ${D}^{0}$→K$^{+}$K$^{-}$ and ${D}^{0}$→${\pi}^{+}{\pi}^{-}$ decays at CDF

CDF Collaboration; Kilminster, B; Canelli, M F; et al (2014). Measurement of indirect $CP$-violating asymmetries in ${D}^{0}$→K$^{+}$K$^{-}$ and ${D}^{0}$→${\pi}^{+}{\pi}^{-}$ decays at CDF. Physical Review D (Particles, Fields, Gravitation and Cosmology), 90:111103(R).

## Abstract

We report a measurement of the indirect CP-violating asymmetries (AΓ) between effective lifetimes of anticharm and charm mesons reconstructed in D0→K+K- and D0→π+π- decays. We use the full data set of proton-antiproton collisions collected by the Collider Detector at Fermilab experiment and corresponding to 9.7  fb-1 of integrated luminosity. The strong-interaction decay D*+→D0π+ is used to identify the meson at production as D0 or D¯0. We statistically subtract D0 and D¯0 mesons originating from b-hadron decays and measure the yield asymmetry between anticharm and charm decays as a function of decay time. We measure AΓ(K+K-)=(-0.19±0.15(stat)±0.04(syst))% and AΓ(π+π-)=(-0.01±0.18(stat)±0.03(syst))%. The results are consistent with the hypothesis of CP symmetry and their combination yields AΓ=(-0.12±0.12)%.

## Abstract

We report a measurement of the indirect CP-violating asymmetries (AΓ) between effective lifetimes of anticharm and charm mesons reconstructed in D0→K+K- and D0→π+π- decays. We use the full data set of proton-antiproton collisions collected by the Collider Detector at Fermilab experiment and corresponding to 9.7  fb-1 of integrated luminosity. The strong-interaction decay D*+→D0π+ is used to identify the meson at production as D0 or D¯0. We statistically subtract D0 and D¯0 mesons originating from b-hadron decays and measure the yield asymmetry between anticharm and charm decays as a function of decay time. We measure AΓ(K+K-)=(-0.19±0.15(stat)±0.04(syst))% and AΓ(π+π-)=(-0.01±0.18(stat)±0.03(syst))%. The results are consistent with the hypothesis of CP symmetry and their combination yields AΓ=(-0.12±0.12)%.

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