Measurement of the branching fractions and mass spectra for $\tau$ lepton decays including $K_S^0$ at Belle

We report a study of $\tau$ lepton decays involving $\text{Ks}$ with a 669 fb${}^{-1}$ data sample accumulated with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The branching fractions have been measured for the $\text{tauTO}\text{piKs}{\nu }_{\tau }$, $\text{KKs}{\nu }_{\tau }$, $\piKspizero \nu_{\tau}$,$\KKspizero \nu_{\tau}$,$\piKsKs \nu_{\tau}$and$\piKsKspizero \nu_{\tau}$decays\mathrm{.}Wealsoprovidetheunfoldedmassspectrafor$\tauTO \piKspizero \nu_{\tau}$and$\tauTO \KKspizero \nu_{\tau}$.