Forward backward CP asymmetry in ${\tau }^{-}\to K\pi {\nu }_{\tau }$ in the Left-Right Inverse seesaw model

Abstract

The Left--Right Inverse Seesaw (LRIS) model, in which TeV-scale right-handed neutrinos can carry $\mathcal{O}(1)$ Yukawa couplings while light neutrino masses remain protected by a small lepton-number-violating scale, provides a testable link between the neutrino-mass mechanism and flavor and collider observables: the same non-decoupling dynamics has recently been shown to enable viable TeV-scale non-thermal leptogenesis and to explain the $B\to K{\mu }^{+}{\mu }^{-}$ anomaly. Here we examine a further, independent test of the same scalar sector in the semileptonic decay $\tau \to K\pi {\nu }_{\tau }$. We identify a distinct, unsuppressed signal in the \emph{differential} forward-backward CP asymmetry $A_{\mathrm{CP}}^{\mathrm{FB}}(s)$, driven by interference between the SM vector current and a non-decoupling scalar operator $g_S$ generated by a top-quark flavor-changing neutral-current box diagram with internal heavy neutrinos and charged Goldstone bosons. We derive the effective $|\Delta S|=1$ Hamiltonian, verify consistency with $K^0$--${\bar{K}}^0$ and $B_d^0$--${\bar{B}}_d^0$ mixing, $B\to X_s\gamma$, and neutrino non-unitarity constraints, and show numerically that $A_{\mathrm{CP}}^{\mathrm{FB}}(s)$ is resonantly enhanced near the $K_0^{\ast }(1430)$ state, reaching $\mathcal{O}(10^{-4})$ -- within reach of Belle~II.

Comments: 24 pages, 3 figures