Lessons from Recent Measurements of D-\bar D Mixing

TL;DR

Recent measurements of D- D mixing have significantly constrained new physics models, especially those with large tan beta or TeV-scale flavor violation, challenging certain supersymmetric and extra dimension theories.

Contribution

This paper updates constraints on new physics models using recent D- D mixing data, highlighting the proximity of experiments to probing specific flavor violation scenarios.

Findings

Experiments are close to probing minimally flavor violating models with large tan beta.

Data challenge models with TeV-scale flavor violation suppressed by alignment.

Certain supersymmetric and warped extra dimension models are disfavored by the data.

Abstract

An impressive progress in measurements of the D-\bar D mixing parameters has been made in recent years. We explore the implications of these measurements to models of new physics, especially in view of recent upper bounds on the amount of CP violation. We update the constraints on non-renormalizable four-quark operators. We show that the experiments are close to probing minimally flavor violating models with large tan beta. The data challenge models with a scale of order TeV where the flavor violation in the down sector is suppressed by alignment and, in particular, certain classes of supersymmetric models and of warped extra dimension models.