Constraining unparticle physics from $CP$ violation in Cabibbo-favored decays of D mesons

According to the standard model, the Cabibbo-favored (CF) decays are $CP$ conserve at tree level. Observation of any finite $CP$ asymmetry can be received as a signal of new physics. In CF charm meson decays, $ D^0 rightarrow K^- pi^+ $ and $ D^+ rightarrow K_s^0 pi^+ $, the following experimental values for their $CP$ asymmetry are reported, respectively: ($0.3 pm 0.7$) % and ($-0.41 pm 0.09$) %. The value of the later can be attributed to the mixing of $ K^0 $ and $ overline{K^0} $, however, its contribution is about ($-0.332 pm 0.006 $) %. In this paper, we use these experimental results to constrain the unparticle stuff as a new physics which may contribute to these $CP$ asymmetries.