Scanning Strategies at the Top Threshold at ILC

TL;DR

This paper explores optimized scanning strategies at the top quark pair production threshold at a future electron-positron collider to achieve high-precision measurements of the top quark mass, width, and Yukawa coupling, considering theoretical and parametric uncertainties.

Contribution

It proposes a method for fast exploratory measurements to determine the top quark mass and studies an optimized 6 GeV energy range scan for precise property measurements.

Findings

Feasible to determine top quark mass with adequate precision

Optimized energy range improves measurement accuracy

Theoretical and parametric uncertainties are significant factors

Abstract

A scan of the top quark pair production threshold at a future electron-positron collider provides the possibility for high-precision measurements of the top quark mass, and, when using two dimensional fits of the measured cross sections, also of other properties such as the width and the Yukawa coupling. The energy range of the scan and the distribution of the integrated luminosity can be optimized depending on the main goals of the threshold program. This contribution examines the possibility to determine the top quark mass in fast exploratory measurements with an adequate precision to enable such an optimization, and studies a scanning program with a reduced energy range of 6 GeV for the measurement of the mass, width and the Yukawa coupling, taking theoretical uncertainties from QCD scale variations and parametric uncertainties from the strong coupling constant into account.