Speaker
Description
We present a measurement of charm mixing and $CP$-violation parameters using $D^0\rightarrow K^0_S\pi^+\pi^-$ decays reconstructed in $pp$ collisions collected by the LHCb experiment from years 2016 to 2018. In particular, the analysis measures the dimensionless parameter $x$ related to the mass difference between the mass eigenstates of the $D^0$ meson. This was observed to be non-zero with a significance exceeding seven standard deviations in $D^{*+}\rightarrow\left( D^0\rightarrow K^0_S\pi^+\pi^-\right)\pi^+$ decay [PRL 127, 111801 (2021)]. We present here an independent measurement where $D^0$ candidates are reconstructed from $B^-\rightarrow D^{0}\mu^{-}X$ decays as the sample covers wider $D^0$ decay time distribution. A combination of the two analyses is performed to maximise the sensitivity.
