New Physics signature in $D^0 (bar{D}^0)to f$ effective width asymmetries

Violation of charge conjugation-parity ($rm CP$) symmetry plays a major rule in the dominance of matter in our universe. A kind of $rm CP$ violation results from the asymmetry of the life time measured in $M^0$ and $bar M^0$, here $M$ is a heavy meson, decays to final states which is referred in the literature as $A_{Gamma}^f$. In this paper, we give an estimation of the upper bound on $|A_{Gamma}^f|$ for the Cabibbo Favored $D^0 rightarrow K^- pi^+$ decay process in different models. We show that in the standard model, $|A_{Gamma}^f| lesssimmathcal{O} (10^{-10})$. Recently a bound on $A_{Gamma}^f$ has been obtained: $(A^f_{Gamma})^{Exp.}= (1.6 pm 1)times 10^{-4}$. This result motivates further studies on $A_{Gamma}^f$ in beyond standard model physics. In the framework of two Higgs doublet model with generic Yukawa structure, we show that $|A_Gamma^{f}|lesssim mathcal{O} (10^{-7})$ which is several orders of magnitude smaller than the current experimental value. Finally, in the framework of left-right symmetric models in which the mixing between the left and the right gauge bosons is allowed and the left-right symmetry is not manifest at unification scale, we find that $A_{Gamma}^f$ can be as large as $|A_{Gamma}^f|lesssimmathcal{O} (10^{-5})$ which is one order of magnitude smaller than the experimentally measured value by LHCb collaborators.