$CP$ violation in $D$ meson decays at Belle

TL;DR

This paper reports on measurements of $CP$ violation and rare decay processes in $D$ mesons using Belle detector data, testing the Standard Model and searching for signs of new physics.

Contribution

First search for $CP$ violation in specific $D^0$ decays and rare $D^0 o \gamma\gamma$ decay using Belle data.

Findings

No significant $CP$ violation observed in studied decays.

Set upper limits on branching fractions for rare decays.

Results consistent with Standard Model predictions.

Abstract

$CP$ violation and branching fraction measurements in $D$ decays are interesting topics as any difference with respect to the Standard Model prediction would be an indication of new physics. With the large data sample collected by the Belle detector, which sits at the interaction point of KEKB asymmetric $e^{+} e^{-}$ collider in Japan, we present the results of searches for $CP$ violation in $D^{0}\rightarrow V\gamma~(V = \phi, \overline{K}^{*0}, \rho^{0})$ decay and the rare $D$ decay $D^{0}\rightarrow \gamma \gamma$.