The processes of gluon fusion producing chargino or neutralino pairs at high energies

TL;DR

This paper investigates gluon fusion processes producing charginos and neutralinos in the MSSM at high energies, confirming helicity conservation and deriving simplified amplitude expressions relevant for LHC experiments.

Contribution

It demonstrates the realization of helicity conservation in gluon fusion to charginos and neutralinos at one-loop electroweak order, providing high-energy amplitude formulas and observable cross section relations.

Findings

Helicity-conserving amplitudes dominate at high energies.

Derived simple expressions for non-vanishing amplitudes.

Established asymptotic relations among cross sections.

Abstract

According to the helicity conservation (HCns) theorem, the sum of the helicities should be conserved, in any 2-to-2 processes in MSSM with R-parity conservation, at high energies; i.e. all amplitudes violating this rule, must vanish asymptotically. The realization of HCns in gluon-fusion to charginos or neutralinos is studied, at the one loop electroweak order (EW), and simple high energy expressions are derived for the non-vanishing helicity conserving (HC) amplitudes. These are very similar to the corresponding expressions for $gg \to W^+W^-, ZZ, \gamma Z, \gamma\gamma $ derived before. Asymptotic relations among observable unpolarized cross sections for many such processes are then obtained, some of which may hold at LHC-type energies.