Weight function method for precise determination of top quark mass at Large Hadron Collider

TL;DR

This paper introduces a new weight function method for precisely measuring the top quark mass at the LHC, using lepton energy distribution and showing promising statistical and systematic uncertainty control.

Contribution

The paper presents a novel weight function method that allows for a theoretically well-defined top quark mass measurement independent of production process details.

Findings

Estimated statistical error of 0.4 GeV at 100 fb$^{-1}$ luminosity.

Simulation results demonstrate good control of systematic uncertainties.

Method applicable to top quark mass reconstruction in $t\bar{t}$ events.

Abstract

We propose a new method to measure a theoretically well-defined top quark mass at the LHC. This method is based on the "weight function method," which we proposed in our preceding paper. It requires only lepton energy distribution and is basically independent of the production process of the top quark. We perform a simulation analysis of the top quark mass reconstruction with $t\bar{t}$ pair production and lepton+jets decay channel at the leading order. The estimated statistical error of the top quark mass is about $0.4$ GeV with an integrated luminosity of $100$ fb$^{-1}$ at $\sqrt{s}=14$ TeV. We also estimate some of the major systematic uncertainties and find that they are under good control.