Charm CP violation and mixing at Belle

2014/10/01 by Ko, B. R.
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1410.0188

Abstract

We present charm CP violation and mixing measurements at Belle. They are the first observation of D⁰-D⁰ mixing in e⁺e^- collisions from D⁰→ K⁺π^- decays, the most precise mixing and indirect CP violation parameters from D⁰→ K⁰_Sπ⁺π^- decays, and the time-integrated CP asymmetries in D⁰→π⁰π⁰ and D⁰→ K⁰_Sπ⁰ decays. Our mixing measurement in D⁰→ K⁺π^- decays excludes the no-mixing hypothesis at the 5.1 standard deviation level. The mixing parameters x=(0.56±0.19^+0.03+0.06_-0.09-0.09)%, y=(0.30±0.15^+0.04+0.03_-0.05-0.06)% and indirect CP violation parameters |q/p|=(0.90^{+0.16+0.05+0.06}_{-0.15-0.04-0.05}), arg(q/p)=(-6±11±3⁺³_-4)^∘ measured from D⁰→ K⁰_Sπ⁺π^- decays, and the time-integrated CP asymmetries A^D0→π0π0_CP=(-0.03±0.64±0.10)% and A^{D0→ K0_Sπ0}_CP=(-0.21±0.16±0.07)% are the most precise measurements to date. Our measurements here are consistent with predictions of the standard model.

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