CP violation in D meson decays: would it be a sign of new physics ?

TL;DR

This paper investigates CP violation in D meson decays, suggesting that large final state interactions could lead to observable CP asymmetries, which might indicate new physics beyond the Standard Model.

Contribution

It proposes a mechanism linking SU(3) violations and final state interactions to CP violation, predicting specific asymmetry patterns in D meson decays.

Findings

Predicted CP asymmetry in charged pion decays is over twice as large as in charged kaon decays.

Asymmetries have opposite signs for pion and kaon decay channels.

The asymmetry magnitude depends on the uncertain penguin contribution strength.

Abstract

Ascribing the large SU(3) violations in the Cabibbo forbidden decays of neutral D mesons to the final state interactions, one gets large strong phase differences, necessary for substantial direct CP violation. While the absolute value of the CP violating asymmetries depend on the uncertain strength of the penguin contribution, we predict an asymmetry for the decays into charged pions more than twice as large and having opposite sign with respect to that for charged kaons.