Charm mixing at LHCb

Abstract

We report a measurement of the time-dependent ratio of $D^0\to K^{+}{\pi }^{-}$ to $D^0\to K^{-}{\pi }^{+}$ decay rates in $D^{\ast +}$-tagged events using 1.0\,fb${}^{-1}$ of integrated luminosity recorded by the LHCb experiment. We measure the mixing parameters $x^{\prime 2}=(-0.9\pm 1.3)\times 10^{-4}$, $y^{\prime }=(7.2\pm 2.4)\times 10^{-3}$ and the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates $R_D=(3.52\pm 0.15)\times 10^{-3}$. The result excludes the no-mixing hypothesis with a probability corresponding to 9.1 standard deviations and represents the first observation of charm mixing from a single measurement

5 pages, 6 figures, 2 tables. Proceedings of HCP 2012

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