Color Sextet Scalars at the CERN Large Hadron Collider

TL;DR

This paper investigates the production and decay of color sextet scalars at the LHC, proposing a new method to detect their unique signatures in multijet and dilepton events, covering masses up to 1 TeV.

Contribution

It introduces a novel search strategy for color sextet scalars at the LHC, focusing on their pair production and decay into same-sign top quarks, with a reconstruction method for on-shell ttar{t}ar{t} final states.

Findings

Search can probe sextet masses up to 1 TeV with 100 fb^-1

QCD production dominates the scalar pair production

New reconstruction method enhances detection sensitivity

Abstract

Taking a phenomenological approach, we study a color sextet scalar at the LHC. We focus on the QCD production of a color sextet pair \Phi_6\bar{\Phi}_{6} through gg fusion and q\bar{q} annihilation. Its unique coupling to \bar{\psi^c}\psi allows the color sextet scalar to decay into same-sign diquark states, such as \Phi_6\to tt/tt^*. We propose a new reconstruction in the multijet plus same sign dilepton with missing transverse energy samples to search for on-shell tt\bar{t}\bar{t} final states from sextet scalar pair production. Thanks to the large QCD production, the search covers the sextet mass range up to 1 TeV for 100 fb^-1 integrated luminosity.