Speaker
Description
We find a new $CP$-violation effect in charm decays into neutral kaons,
which results from the interference between two tree (Cabibbo-favored
and doubly Cabibbo-suppressed) amplitudes with the mixing of final-state
mesons. This effect, estimated to be of an order of $10^{-3}$, is much
larger than the direct $CP$ asymmetries in these decays, but missed in
the literature. It can be revealed by measuring the difference of the
time-dependent $CP$ asymmetries in the $D^{+}\to \pi^{+}K_S^0$ and
$D_{s}^{+}\to K^{+} K_S^0$ modes, which are accessible at the LHCb
and Belle II experiments. If confirmed, the new effect has to be
taken into account, as the above direct $CP$ asymmetries are used to
search for new physics.
This work has been published in Phys.Rev.Lett 119.181802(2017).
