Resonance contribution of scalar color octet to $t \bar{t}$ production at the LHC in the minimal four color quark-lepton symmetry model

TL;DR

This paper calculates the scalar color octet's contribution to top-antitop production at the LHC within a minimal four-color quark-lepton symmetry model, showing it can significantly affect resonance signals depending on the octet mass.

Contribution

It provides a detailed analysis of the scalar color octet F_2's impact on t-tbar production, including one-loop effects, within a specific minimal model.

Findings

Scalar octet contribution can reach over 10% for certain masses.

Resonance detection in dijet spectra is challenging due to small effective coupling.

Contribution varies with scalar octet mass, affecting resonance search strategies.

Abstract

The scalar color octet contribution to the resonance $t\bar{t}$-pair production at the LHC is calculated and analysed with account of the one loop effective two gluon vertex. It is shown that this contribution from the scalar color octet $F_2$ predicted by the minimal model with the four color quark-lepton symmetry is for $\sqrt{s}=13$ TeV of about a few percents for $750 < m_{F_2} < 1800$ GeV and can exceed 10% for $400 < m_{F_2} < 750$ GeV. It is also pointed out that the search for the scalar octet $F_2$ as the resonance in the dijet mass spectra seems to be difficult because of the smallness of its one loop effective two gluon interaction.