In this work, we study the C P asymmetry in the angular distribution of τ → KSπντ decays, taking into account the known C P violation in
$$ {K}^0-{\overline{K}}^0 $$
mixing. It is pointed out for the first time that, once the well-measured C P violation in the neutral kaon system is invoked, a non-zero C P asymmetry would appear in the angular observable of the decays considered, even within the Standard Model. By employing the reciprocal basis, which is most convenient when a KS(L) is involved in the final state, the C P -violating ang...
