Pair Production of the Lightest Chargino via Gluon-Gluon Collisions

TL;DR

This paper investigates the production of the lightest chargino pairs via gluon-gluon fusion in the MSSM at proton-proton colliders, showing it can be a significant process comparable to Drell-Yan, and useful for probing CP-violation.

Contribution

It provides the first detailed calculation of chargino pair production via gluon fusion in the MSSM, highlighting its potential significance at the LHC and its sensitivity to CP-violating phases.

Findings

Production rate can exceed 2.7 femto barn for higgsino-like charginos.

Total cross section at LHC can reach 56 femto barn.

Process can be used to extract CP-violating phase information.

Abstract

The production of the lightest chargino pair from gluon-gluon fusion is studied in the minimal supersymmetric model(MSSM) at proton-proton colliders. We find that with the chosen parameters, the production rate of the subprocess can be over 2.7 femto barn when the chargino is higgsino-like, and the corresponding total cross section in proton-proton collider can reach 56 femto barn at the LHC in the CP-conserving MSSM. It shows that this loop mediated subprocess can be competitive with the standard Drell-Yan subprocess in proton-proton colliders, especially at the LHC. Furthermore, our calculation shows it would be possible to extract information about some CP-violating phase parameters, if we collected enough chargino pair events.