NLO Polarized Chargino pair Production in Electron Positron Annihilation

TL;DR

This paper computes complete one-loop quantum corrections to polarized chargino pair production in electron-positron collisions within the MSSM, highlighting significant effects on differential cross sections with specific helicities.

Contribution

It provides a comprehensive calculation of one-loop corrections including QED and non-QED effects for polarized chargino production in the MSSM, using advanced regularization and subtraction techniques.

Findings

Quantum corrections significantly affect differential cross sections.

Non-QED and QED corrections are both essential for accurate predictions.

Results are demonstrated in the Focus Point scenario of mSUGRA.

Abstract

We calculate the complete one-loop quantum corrections to the helicity eigenstate chargino pair production cross sections in polarized electron positron collisions, within the Minimal Supersymmetric Standard Model. We calculate the non-QED corrections using the helicity amplitudes formalism, and Dimensional Regularization to deal with ultraviolet divergences. We calculate QED corrections using the dipole subtraction formalism to extract soft and collinear divergences in Bremsstrahlung, canceling them with the infrared divergences from virtual QED corrections. We show numerical results for the Focus Point scenario in mSUGRA, where we find important quantum corrections for differential cross sections with definite chargino helicities.