Top-Quark Mass Measurement in the Dilepton Channel Using {\it in situ} Jet Energy Scale Calibration

TL;DR

This paper presents a novel method for measuring the top-quark mass in dilepton events at the LHC, using an in situ jet energy scale calibration to improve precision and reduce uncertainties.

Contribution

The study introduces a simultaneous fit technique using three variables to extract both the top-quark mass and jet energy scale from LHC data.

Findings

Achieves top-quark mass measurement with less than 1 GeV/c^2 uncertainty.

Reduces jet energy scale uncertainty significantly.

Demonstrates method effectiveness with 5 fb$^{-1}$ simulated data.

Abstract

We employ a top-quark mass measurement technique in the dilepton channel with {\it in situ} jet energy scale calibration. Three variables having different jet energy scale dependences are used simultaneously to extract not only the top-quark mass but also the energy scale of the jet from a single likelihood fit. Monte Carlo studies with events corresponding to an integrated luminosity of 5 fb$^{-1}$ proton-proton collisions at the Large Hadron Collider $\sqrt{s} = 7$ TeV are performed. Our analysis suggests that the overall jet energy scale uncertainty can be significantly reduced and the top-quark mass can be determined with a precision of less than 1 GeV/c$^2$, including jet energy scale uncertainty, at the Large Hadron Collider.