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Measurement of the charm-mixing parameter $$y_{CP}$$ in $$D^{0}to K^{0}_{S}omega$$ decays at Belle

Nayak, M.*; Tanida, Kiyoshi  ; Belle Collaboration*; 180 of others*

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 $$976rm~ fb^{-1}$$ 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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Category:Astronomy & Astrophysics

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