# CP violating triple product asymmetries in charm decays

## TL;DR

This paper discusses the search for CP violation in charm meson decays using triple-product asymmetries, which could indicate new physics beyond the Standard Model, with recent experimental results from BaBar, LHCb, and Belle.

## Contribution

It introduces a novel measurement of time-reversal asymmetry in charm decays using triple-product correlations, including the first such measurement in $D^{0} o K^{+}K^{-}
ho^{+}
ho^{-}$ decays.

## Key findings

- Previous experiments set limits on CP violation asymmetries.
- The Belle collaboration performed the first measurement of kinematic asymmetry variables in this context.
- Results are consistent with Standard Model expectations, with no significant CP violation observed.

## Abstract

$CP$ violation asymmetry is expected to be very small within the Standard Model. Observation of $CP$ violation in charm sector would hint towards New Physics. Time-reversal asymmetry is sensitive to $CPV$ via the $CPT$ Theorem, and is a clean and alternative way to search for CP violation in charm decays. This is achieved by the use of triple-product correlations in 4-body charm meson decays. The results from previous searches at BaBar and LHCb Collaborations and the latest results from Belle are reported. The most recent result from Belle performed in $D^{0} \to K^{+}K^{-}\pi^{+}\pi^{-}$ decays using kinematic asymmetry variables is the first measurement of its kind.