Null test searches for BSM physics with rare charm decays

TL;DR

This paper reviews how null test observables in rare charm decays can probe physics beyond the Standard Model, highlighting their potential to reveal new phenomena through CP asymmetries, lepton universality, and other measurements.

Contribution

It provides an overview of null test opportunities in rare charm decays, emphasizing their unique role in exploring BSM physics in the up-sector.

Findings

Null test observables can effectively probe BSM physics.

Different charm decay modes offer complementary null test opportunities.

Rare charm decays provide clean signatures for new physics searches.

Abstract

Semileptonic Flavor Changing Neutral Current decays of charmed hadrons uniquely probe the up-sector of the Standard Model. Clean null test observables, such as CP-asymmetries, lepton-universality ratios, missing energy modes, lepton flavor violating modes and angular observables can be studied in a variety of charmed meson and baryon modes. An overview of null test opportunities with rare charm decays is presented and similarities and complementarities of different modes are worked out.