Measurement of the charm-mixing parameter ${y}_{CP}$ in ${D}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}\ensuremath{\omega}$ decays at Belle

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Measurement of the charm-mixing parameter $y_{C P}$ in $D^{0} \to K_{S}^{0} ω$ decays at Belle

M. Nayak et al. (Belle Collaboration)

Phys. Rev. D 102, 071102(R) – Published 19 October 2020

Abstract

We report the first measurement of the charm-mixing parameter $y_{C P}$ in $D^{0}$ decays to the $C P$ -odd final state $K_{S}^{0} ω$ . The study uses the full Belle $e^{+} e^{-}$ annihilation data sample of $976 {fb}^{- 1}$ taken at or near the $ϒ (4 S)$ centre-of-mass energy. We find $y_{C P} = (0.96 \pm 0.91 \pm {0.62}_{- 0.00}^{+ 0.17}) %$ , 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 $C P$ -even decays in the data sample.

Received 24 December 2019
Accepted 24 September 2020

DOI:https://doi.org/10.1103/PhysRevD.102.071102

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Published by the American Physical Society