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Measurement of the charm-mixing parameter y_(CP) in D⁰to K⁰_(S)ω decays at Belle
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arxiv 1912.10912 v2 pith:DZUGMQNB submitted 2019-12-23 hep-ex
Measurement of the charm-mixing parameter y_(CP) in D⁰to K⁰_(S)ω decays at Belle
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We report the first measurement of the charm-mixing parameter $y_{CP}$ in $D^{0}$ decays to the $CP$-odd final state $K^{0}_{S}\omega$. The study uses the full Belle $e^{+}e^-$ annihilation data sample of $976\rm~ fb^{-1}$ taken at or near the $\Upsilon(4S)$ centre-of-mass energy. We find $y_{CP} = (0.96 \pm 0.91 \pm 0.61 {}^{+0.17}_{-0.00})\%$, where the first uncertainty is statistical, the second is systematic due to event selection and background, and the last is due to possible presence of $CP$-even decays in the data sample.
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