CP violation and CKM predictions from Discrete Torsion

TL;DR

This paper introduces a supersymmetric D-brane model where CP violation arises spontaneously due to discrete torsion, leading to specific predictions for the CKM matrix and phase.

Contribution

It proposes a novel D-brane model with spontaneous CP violation from discrete torsion, predicting a CKM phase near Pi/3 with a simplified parametrization.

Findings

CKM phase predicted close to Pi/3

CKM matrix expressed with two free parameters

Kahler metric texture zeros dictated by discrete torsion

Abstract

We present a supersymmetric D-brane model that has CP spontaneously broken by discrete torsion. The low energy physics is largely independent of the compactification scheme and the kahler metric has `texture zeros' dictated by the choice of discrete torsion. This motivates a simple ansatz for the kahler metric which results in a CKM matrix given in terms of two free parameters, hence we predict a single mixing angle and the CKM phase. The CKM phase is predicted to be close to Pi/3.