Pair-production and Three-body Decay of the Lighter Stop at the ILC in One-loop Order in the MSSM

TL;DR

This paper presents one-loop order calculations of pair-production and three-body decay of the lighter stop at the ILC within the MSSM, using the GRACE/SUSY-loop program, highlighting the impact of SUSY mass spectra on decay distributions.

Contribution

The paper introduces numerical results for stop production and decay at the ILC using an automated one-loop calculation program, considering different SUSY scenarios.

Findings

QCD and EW corrections increase decay widths and cross sections

Decay distributions depend on SUSY mass spectrum

Results demonstrate the effectiveness of GRACE/SUSY-loop for MSSM processes

Abstract

We have been developing a program package called GRACE/SUSY-loop which automatically calculates the MSSM amplitudes in one-loop order. We present numerical results of calculations for pair-production and three-body decay of the lighter stop ($\widetilde{t}_1$) at the International Linear Collider (ILC) using GRACE/SUSY-loop. Since the distributions of missing transverse energy (MET) depend on mass spectrum of SUSY particles, we consider two scenarios on three-body decay of $\widetilde{t}_1$. In these scenarios, both QCD and EW corrections have positive sign for decay widths and cross sections.