Top-quark mass determination in the optimised threshold scan

TL;DR

This paper presents an optimized method for measuring the top-quark mass at future e+e- colliders using threshold scans, achieving high precision by including systematic uncertainties and employing genetic algorithms for optimization.

Contribution

It introduces a comprehensive approach to top-quark mass determination at CLIC, incorporating all relevant parameters and uncertainties, and demonstrates an optimization technique to improve measurement precision.

Findings

Top-quark mass can be measured with 30-40 MeV precision at 100 fb^-1.

Optimization reduces statistical uncertainty by approximately 20%.

The method accounts for systematic uncertainties in the fit procedure.

Abstract

One of the important goals at the future e$^+$e$^-$ colliders is to measure the top-quark mass and width in a scan of the pair production threshold. Presented in this work is the most general approach to the top-quark mass determination from the threshold scan at CLIC, with all relevant model parameters and selected systematic uncertainties included in the fit procedure. In the baseline scan scenario the top-quark mass can be extracted with precision of the order of 30 to 40 MeV, already for 100 fb$^{-1}$ of data collected at the threshold. We present the optimisation procedure based on the genetic algorithm with which the statistical uncertainty of the mass measurement can be reduced by about 20%.