Strong-Weak Bi-Adjoints, Gluon-W resonances, and new asymmetric LHC production processes

TL;DR

This paper proposes a new production and decay mechanism for a bi-adjoint scalar particle at the LHC, introducing a novel search strategy that could discover such particles up to 3 TeV mass with high significance.

Contribution

It introduces a new effective operator model for bi-adjoint scalars, explores their LHC production modes, and proposes a novel search strategy with significant discovery potential.

Findings

Single production mode dominates for TeV-scale masses.

HL-LHC search can discover bi-adjoint particles up to 3 TeV.

Potential for 5-sigma discovery with 10 TeV cutoff at 3 TeV mass.

Abstract

We study a novel production and decay mechanism for a bi-adjoint spin zero particle in the ($8,3,0$) representation of the Standard Model gauge groups. This work is part of a series studying new production processes for exotic particles in higher representations of Standard Model color and weak charge. Here, we study a specific new dimension 5 effective operator model which couples an exotic bi-adjoint scalar field to the SU(3) and SU(2) field strength tensors. The W-gluon resonant decay of the charged component of this new exotic field is explored. We discuss LHC production modes of both the charged and neutral bi-adjoint states and find a new single production mode for the charged state. This is the dominant LHC production mode for TeV-scale masses. We introduce a new HL-LHC search in which a single bi-adjoint is produced in association with a hard forward quark jet from asymmetric W-gluon fusion. This search yields a 5-sigma discovery potential for bi-adjoint masses up to 3 TeV for 10 TeV scalar effective operator cutoffs. We also find 2-sigma sensitivity at the HL-LHC for bi-adjoint masses up to 4 TeV and effective cutoffs in the 15 TeV range for the full 3 inverse atto-barn data set.