The D0 Dimuon Charge Asymmetry and Baryon Asymmetry of the Universe

TL;DR

This paper explores new physics models involving scalar and fermions to explain the D0 dimuon charge asymmetry and the matter-antimatter asymmetry of the universe, extending the Standard Model.

Contribution

It proposes a model with a color-triplet scalar and Majorana fermions to account for observed anomalies and baryon asymmetry, offering a novel theoretical framework.

Findings

The model can explain the D0 dimuon charge asymmetry.

It provides a mechanism for the matter-antimatter asymmetry.

Implications for new physics beyond the Standard Model.

Abstract

The D0 collaboration has reported a 3.2 \sigma deviation from the Standard Model (SM) prediction in the like-sign dimuon charge asymmetry. New physics beyond the SM in B_s - \bar B_s mixing is needed to explain the data. In this paper, we investigate the possible extension of the SM with one generation color-triplet charged scalar as well as three generation Majorana fermions. We study the implications of the model on the D0's dimuon charge asymmetry as well as matter anti-matter asymmetry of the Universe.