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

## TL;DR

This paper uses experimental $CP$ asymmetry measurements in charm meson decays to place constraints on unparticle physics as a potential source of new $CP$ violation beyond the standard model.

## Contribution

It introduces a novel approach to constrain unparticle physics using $CP$ violation data from charm meson decays.

## Key findings

- Constraints on unparticle parameters derived from $CP$ asymmetry measurements.
- No significant deviation from standard model $CP$ conservation observed.
- Provides limits on unparticle contributions to charm meson decay processes.

## Abstract

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.