Time integrated ratio of wrong-sign to right-sign $D^0 \rightarrow K\pi$ decays in 2010 data at LHCb

First results of the measurement on wrong-sign $D^0 \rightarrow K^{+} \pi^{-}$ decays based on the 2010 dataset taken with the LHCb detector are presented. The ratio of wrong-sign to right-sign ($D^0 \rightarrow K^{-} \pi^{+}$) $D^0$ decays corrected for the decay time acceptance is determined to be $R_{{\rm corr}}=(0.409 \pm 0.031 ({\rm stat.}) \pm 0.039 ({\rm sys.})) \% $. This analysis is the first step towards a measurement of the time-dependent wrong-sign to right-sign ratio from which the $D^0$ mixing parameters can be extracted.