Measurement of $D^0$-$\overline{D}{}^0$ Mixing and Search for Indirect $CP$ Violation Using $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ Decays

Abstract

We report a measurement of $D^0$-$\overline{D}{}^0$ mixing parameters and a search for indirect $CP$ violation through a time-dependent amplitude analysis of $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ decays. The results are based on 921~fb${}^{-1}$ of data accumulated with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. Assuming $CP$ conservation, we measure the mixing parameters $x=(0.56\pm 0.19_{-0.09}^{+0.03}{}_{-0.09}^{+0.06})\%$ and $y=(0.30\pm 0.15_{-0.05}^{+0.04}{}_{-0.06}^{+0.03})\%$, where the errors are statistical, experimental systematic, and systematic due to the amplitude model, respectively. With $CP$ violation allowed, the parameters $|q/p|=0.90_{-0.15}^{+0.16}{}_{-0.04}^{+0.05}{}_{-0.05}^{+0.06}$ and $\arg (q/p)=(-6\pm 11\pm 3{}_{-4}^{+3}{)}^{\circ }$ are found to be consistent with conservation of $CP$ symmetry in mixing and in the interference between mixing and decay, respectively.

submitted to PRD(RC)

References in corpus (3)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Implications of D^0-\bar D^0 Mixing for New Physics
• Charm mixing in the Standard Model and beyond

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