Implications of the LHCb discovery of CP violation in charm decays

TL;DR

The paper investigates whether new physics models can explain the LHCb observed CP violation in charm decays without relying on large hadronic enhancements, analyzing implications in effective theories and specific models.

Contribution

It explores the potential of various new physics models to account for CP violation in charm decays without large hadronic effects, providing a comprehensive theoretical analysis.

Findings

Standard Model requires large hadronic enhancements to explain data

Certain NP models can account for CP violation without such enhancements

Implications for low-energy effective theories and specific NP scenarios

Abstract

The recent measurement of $\Delta A_{CP}$ by the LHCb collaboration requires an ${\cal O}(10)$ enhancement coming from hadronic physics in order to be explained within the SM. We examine to what extent can NP models explain $\Delta A_{CP}$ without such enhancements. We discuss the implications in terms of a low energy effective theory as well as in the context of several explicit NP models.