Measurement of D0-antiD0 mixing parameters using D0 -> K0S pi+ pi- and D0 -> KS0 K+ K- decays

Abstract

We report a direct measurement of $D^0-overline{D}^0$ mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$ and, for the first time, $D^0\to K_S^0{K}^{+}{K}^{-}$ decays. The low-momentum pion ${\pi }_s^{+}$ in the decay $D^{\ast +}\to D^0{\pi }_s^{+}$ identifies the flavor of the neutral $D$ meson at its production. Using 468.5 fb${}^{-1}$ of $e^{+}{e}^{-}$ colliding-beam data recorded near $\sqrt{s}=10.6$~GeV by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters $x=[1.6\pm 2.3(stat.)\pm 1.2(syst.)\pm 0.8(\mathrm{model})]\times 10^{-3}$, and $y=[5.7\pm 2.0(stat.)\pm 1.3(syst.)\pm 0.7(\mathrm{model})]\times 10^{-3}$. These results provide the best measurement to date of $x$ and $y$. The knowledge of the value of $x$, in particular, is crucial for understanding the origin of mixing.

7 pages, 3 postscript figures, supplementary material. Accepted by Phys. Rev. Lett

References in corpus (1)

• Charm mixing in the Standard Model and beyond

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