Productions of heavy charged leptons via gluon fusion at LHC: A revisit

TL;DR

This paper revisits heavy charged lepton production at the LHC via gluon fusion, incorporating full loop calculations, updated PDFs, and electroweak data, revealing that gluon fusion can dominate over Drell-Yan in certain mass ranges.

Contribution

It provides a comprehensive analysis of heavy lepton production via gluon fusion, including contributions from new quarks and vector-like leptons, with updated numerical results.

Findings

Gluon fusion can dominate Drell-Yan production for heavy leptons in some mass ranges.

Numerical cross sections are smaller than previous estimates due to full loop calculations and mixing effects.

The study emphasizes the role of Higgs-mediated processes in vector-like lepton production.

Abstract

Heavy charged lepton productions via gluon fusion at the LHC are revisited. Full loop calculations are adopted with an updated parton distribution function and electroweak data. Including contribution from new generation quarks in the loop, pair production of the sequential heavy lepton via gluon fusion at the LHC dominates over that via the Drell-Yan mechanism in some heavy lepton mass range. Exotic lepton single production of vector-like lepton extended models is also calculated. In the later case, the gluon fusion mechanism via the Higgs exchange is emphasized. Our numerical results for both pair and single production of heavy leptons are smaller than previous studies especially for a large heavy lepton mass as a result of full loop calculation and due to the mixing angles.