CDF results on CP violation in charm

الأصل · EN

I discuss the measurement of CP-violating asymmetries (AΓ) between effective lifetimes of D⁰ or D⁰ mesons. Fully reconstructed D⁰→ K+ K- and D⁰→ π+π- decays collected in pp collisions by the Collider Detector at Fermilab experiment and corresponding to a data set of 9.7 fb⁻¹ of integrated luminosity are used. The flavor of the charm meson at production is determined by exploiting the decay D*⁺ → D⁰ π+. Contamination from mesons originated in b-hadron decays is subtracted from the sample. Signal yields as functions of the observed decay-time distributions are determined using likelihood fits and used to measure the asymmetries. The results, AΓ(K+K-) = (-1.9 ± 1.5 (stat) ± 0.4 (syst))×10⁻³ and AΓ(π+π-)= (-0.1 ± 1.8 (stat) ± 0.3 (syst))×10⁻³, and their combination, AΓ= (-1.2 ± 1.2)×10⁻³, are consistent with the SM predictions and other experimental determinations.