NLO Event Simulation for Chargino Production at the ILC

TL;DR

This paper extends the Whizard Monte Carlo generator to simulate chargino production at the ILC at NLO, comparing fixed order and resummation methods for photon inclusion, and analyzing their systematic uncertainties.

Contribution

It introduces a resummation approach for NLO chargino production simulation that overcomes negative weights and reduces systematic errors.

Findings

Resummation method eliminates negative event weights.

Residual uncertainty reduced to per-mil level.

Comparison of fixed order and resummation approaches.

Abstract

We present an extension of the Monte Carlo Event Generator Whizard which includes chargino production at the ILC at NLO. We include photons using both a fixed order and a resummation approach. While the fixed order approach suffers from negative event weights, the resummation method solves this problem and automatically includes leading higher order corrections. We present results for cross sections and event generation for both methods and evaluate the systematic errors due to soft and collinear approximations. In the resummation approach, the residual uncertainty can be brought down to the per-mil level.