Nonleptonic Charm Decays and CP Violation

TL;DR

This paper discusses a flavor-SU(3) approach to analyze charm meson decays and CP violation, proposing a model for SU(3)-breaking effects and explaining recent experimental CP violation observations within the Standard Model.

Contribution

It introduces a flavor-SU(3) framework for charm decay analysis, including a model for SU(3)-breaking and a proposal for enhanced CP violation explaining recent data.

Findings

A model for SU(3)-breaking in D^0 decays

Explanation of recent CP violation observations in charm decays

Predictions for CP violation in specific decay channels

Abstract

In this talk we briefly present a flavor-SU(3) technique to study branching ratios and direct CP asymmetries $D$-meson decays. The first part of the talk is meant to set up a foundation, based on previous work, to deal with flavor-SU(3) amplitudes and relative strong phases. In addition, we present a model for dealing with SU(3)-breaking in branching ratio measurements of SCS $D^0$ decays. In the second part of the talk we make use of a proposal for an enhanced CP-violating penguin in the SM, to explain the recent LHCb and CDF observations of CP violation in SCS $D^0$ decays. Furthermore, we use our model to predict CP violation in $\pi^0\pi^0$ and $K^+\bar{K}^0$ final states. Large experimental bounds on individual CP asymmetries give rise to a large allowed range of $\delta$, the strong phase of the CP-violating penguin. We also briefly discuss future prospects.