Combining K-\bar K mixing and D-\bar D mixing to constrain the flavor structure of new physics

TL;DR

This paper explores how combining measurements of K- K and D- D mixings can effectively constrain the flavor structure of new physics models, especially under SU(2)_L invariance.

Contribution

It introduces a method to use combined K and D mixing data to limit flavor misalignments and splittings in new physics scenarios.

Findings

Combined measurements impose strong constraints on flavor misalignments.

SU(2)_L invariance links K and D mixing constraints.

Method enhances sensitivity to new physics effects.

Abstract

New physics at high energy scale often contributes to K-\bar K and D-\bar D mixings in an approximately SU(2)_L invariant way. In such a case, the combination of measurements in these two systems is particularly powerful. The resulting constraints can be expressed in terms of misalignments and flavor splittings.