Study of CP Violation in charm decays

TL;DR

This paper investigates CP violation in charm decays, comparing theoretical predictions within the Standard Model to experimental results from LHCb, and explores similarities with CP violation in neutrino oscillations.

Contribution

It provides a detailed phenomenological analysis of CP violation in charm decays, integrating CKM matrix theory with recent experimental findings and comparing with neutrino oscillation CP violation.

Findings

CP violation observed in charm decays aligns with SM predictions

Comparison shows similarities between CP violation in charm decays and neutrino oscillations

Theoretical models are consistent with LHCb experimental results

Abstract

The violation of the Charge-Parity (CP) symmetry is a phenomenon described by the Standard Model (SM), however, its predictions for this violation are not enough to explain the matter-antimatter asymmetry in the visible universe. Experimentally, CP violation in hadronic decays had already been observed in various circumstances before 2019, when the LHCb experiment at CERN first published results reporting CPV in D-meson decays [arXiv:1903.08726v2] ($D^0 \to K^- K^+$ and $D^0 \to \pi^- \pi^+$). In this work, a study of CP violation is carried out analysing the phenomenology of charm decays. The study of such topic is guided by the Cabibbo-Kobayashi-Maskawa (CKM) matrix and the process of flavour changing decays caused by the weak interaction (focusing on charm decays). The symmetries attributed to physical conservation laws were recognized, allowing for the possibilities of CP violation predicted by the SM to be examined more closely. Such theoretical studies are then compared to the results obtained by the LHCb Collaboration. Furthermore, a comparison between CPV in charm decays and in neutrino oscillations is made, analysing the CP violating phase in both the CKM and the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrices.