Probing New Physics in Charm Couplings with FCNC

TL;DR

This paper investigates potential deviations from the Standard Model in charm quark interactions, focusing on how anomalous W-charm couplings could influence flavor-changing neutral current processes, with implications for understanding flavor physics.

Contribution

It introduces a comprehensive analysis of constraints on anomalous W-charm couplings and identifies key measurements sensitive to new physics in the charm sector.

Findings

Constraints on left- and right-handed W-charm couplings derived

Identification of measurements most sensitive to charm FCNC deviations

Enhanced understanding of flavor dynamics beyond the Standard Model

Abstract

Low-energy experiments involving kaon, B-meson, D-meson, and hyperon flavor-changing neutral transitions have confirmed the loop-induced flavor-changing neutral current (FCNC) picture of the standard model (SM). The continuing study of these processes is essential to further refine this picture and ultimately understand the flavor dynamics. In this paper we consider deviations from the SM in the charm sector and their effect on FCNC processes. Specifically, we parameterize new physics in terms of left- and right-handed anomalous couplings of the W boson to the charm quark. We present a comprehensive study of existing constraints and point out those measurements that are most sensitive to new physics of this type.