Physics reach of ${D}_{(s)}\to \pi(K) \ell\ell$ and other charming null test opportunities

TL;DR

This paper explores the potential to test physics beyond the Standard Model through various charm meson decay modes, focusing on null tests like angular observables and CP asymmetries, with model-independent and specific model analyses.

Contribution

It introduces new null test observables and analyzes their correlations within flavorful, anomaly-free Z' models for charm decays.

Findings

Identification of promising null test observables in charm decays.

Model-independent correlations between observables.

Insights into Z' model implications for charm physics.

Abstract

We discuss possibilities to test physics beyond the Standard Model in $\vert\Delta c\vert=\vert\Delta u\vert= 1$ semileptonic, hadronic and missing energy decay modes. Clean null test observables such as angular observables, CP-asymmetries and lepton universality tests are presented and model-independent correlations as well as details within flavorful, anomaly-free $Z^\prime$ models are worked out.