A fourth generation, anomalous like-sign dimuon charge asymmetry and the LHC

TL;DR

This paper proposes that a fourth chiral quark generation with specific mass and CP-violation parameters can explain the D0 collaboration's observed dimuon charge asymmetry, consistent with other decay constraints, and has implications for LHC detection and electroweak symmetry breaking.

Contribution

It introduces a model with a fourth quark generation to explain the dimuon asymmetry, aligning with existing decay constraints and predicting observable effects at the LHC.

Findings

A fourth generation can account for the asymmetry.

Parameters are consistent with B and K decay constraints.

Implications for LHC detection and electroweak symmetry breaking.

Abstract

A fourth chiral generation, with $m_{t^\prime}$ in the range $\sim (300 - 500)$ GeV and a moderate value of the CP-violating phase can explain the anomalous like-sign dimuon charge asymmetry observed recently by the D0 collaboration. The required parameters are found to be consistent with constraints from other $B$ and $K$ decays. The presence of such quarks, apart from being detectable in the early stages of the LHC, would also have important consequences in the electroweak symmetry breaking sector.