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New physics contribution to the lifetime difference in $D^0 - \bar{D}^0$mixing is re-examined within the non-manifest Left-Right Symmetric Model.Diagrams with one of $\Delta C = 1$ transitions, mediated by a propagator with$W_L - W_R$ mixing, are revisited. While these diagrams are believed to givethe dominant contribution, compatible with the experimental data, it is shownthat due to GIM cancelation, such diagrams are negligible in sum. Thus,Left-Right Symmetric Model contribution to the lifetime difference in $D^0 -\bar{D}^0$ mixing is about two orders of magnitude less than actualexperimental value for $\Delta \Gamma_D$.

On the Non-Manifest Left-Right Model Contribution to the Lifetime Difference in $D^0 - \bar{D}^0$ Mixing