Muon $g-2$ and $W$-mass in a framework of colored scalars: an LHC perspective

TL;DR

This paper explores an extended Type-X Two-Higgs doublet model with a color octet isodoublet, demonstrating its ability to simultaneously explain the W-boson mass and muon g-2 anomalies, and proposing collider signatures for detection.

Contribution

It introduces a novel model combining a color octet isodoublet with Type-X 2HDM, showing it can account for recent anomalies and suggesting experimental collider signatures.

Findings

The model can simultaneously explain W-mass and muon g-2 anomalies.

Colored scalars relax the parameter space constraints of the pure Type-X 2HDM.

A collider signature with tau+ tau- b b final state is proposed for LHC detection.

Abstract

A color octet isodoublet can have esoteric origins and it complies with minimal flavour violation. In this study, we take a scenario where the well known Type-X Two-Higgs doublet model is augmented with a color octet isodoublet. We shed light on how such a setup can predict the recently observed value for the $W$-boson mass. We also evaluate the two-loop Barr-Zee contributions to muon $g-2$ stemming from the colored scalars. The parameter space compatible with the observed muon $g-2$ gets relaxed w.r.t. what it is in the pure Type-X 2HDM by virtue of the contribution from the colored scalars. The extended parameter region therefore successfully accounts for both the $W$-mass and muon $g-2$ anomalies successfully. Finally, a collider signature leading to $\tau^+ \tau^- b \bar{b}$ final state is explored at the 14 TeV LHC using both cut-based and multivariate techniques. Such a signal can confirm the existence of both colorless as well colored scalars that are introduced by this framework.