The neutron EDM vs up and charm flavour violation

TL;DR

This paper establishes strong bounds on the charm quark's chromo-electric dipole moment and explores their implications for models with flavour violation, highlighting the importance of improved experimental sensitivity.

Contribution

It derives new constraints on the charm quark's CEDM and analyzes their impact on flavour violation models like split-families SUSY and composite Higgs, emphasizing experimental prospects.

Findings

Strong bounds on charm quark CEDM constrain new physics models.

Constraints limit flavour violation contributions in D meson decays.

Results motivate improved experimental searches for hadronic dipoles.

Abstract

We derive a strong bound on the chromo-electric dipole moment of the charm quark, and we quantify its impact on models that allow for a sizeable flavour violation in the up quark sector. In particular we show how the constraints coming from the charm and up CEDMs limit the size of new physics contributions to direct flavour violation in D meson decays. We also specialize our analysis to the cases of split-families Supersymmetry and composite Higgs models. The results we expose motivate an increase in experimental sensitivity to fundamental hadronic dipoles, and a further exploration of the SM contribution to both flavour violating D decays and nuclear electric dipole moments.