Light Axigluon Contributions to b-bbar and c-cbar Asymmetry and Constraints on Flavor Changing Axigluon Currents

TL;DR

This paper explores the impact of light axigluons on quark-antiquark asymmetries, constrains flavor-changing couplings using meson mixing data, and examines their effects on rare meson decays and CP violation.

Contribution

It extends the light axigluon model to include flavor-changing interactions and analyzes their implications for meson decay processes and CP violation phenomena.

Findings

Light axigluons can explain the Tevatron t-tbar asymmetry.

Flavor-changing axigluon couplings are constrained by meson mixing data.

Axigluons may contribute to CP violation in D meson decays.

Abstract

The light axigluon model of Tavares and Schmaltz is a viable candidate to explain the Tevatron t-tbar forward-backward asymmetry. In this paper we present the forward-backward asymmetries for b-bbar and c-cbar systems predicted by the light axigluon. Furthermore, we modify this model to include flavor changing couplings of axigluons with the SM quarks. We constrain these couplings from the available neutral meson mixing data, and investigate their effects on the rare decay B^0_s -> mu^+ mu^-, CP violating D -> h^+ h^- and isospin violating B -> K^(*) mu^+ mu^- decays. We show that a light axigluon can contribute to the observed CP violation in D -> h^+ h^- decays.