# A study of top-quark mass measurement using the lepton energy distribution at the Large Hadron Collider

## TL;DR

This paper explores a method to measure the top-quark mass at the LHC using the lepton energy distribution from top decays, achieving a potential 1 GeV precision with current data.

## Contribution

It introduces a novel approach relying solely on the lepton energy distribution at the parton level for top-quark mass measurement.

## Key findings

- Top-quark mass can be measured within 1 GeV uncertainty.
- Method uses lepton energy distribution and unfolding technique.
- Feasibility demonstrated with simulated LHC data.

## Abstract

We present a feasibility study of top-quark mass measurement using the energy distribution of a lepton from a W boson in a top quark decay in pp collisions at the LHC. The proposed method requires only the lepton energy distribution at the parton level. The analysis is performed in the lepton + jets final state by using fast simulation data corresponding to an integrated luminosity of approximately 20 fb-1 at 14 TeV. Events with exactly one lepton, at least 3 jets and at least 1 b jet are selected. The lepton energy distribution at the parton level is obtained by applying the bin-by-bin unfolding technique. The study shows that the pole mass of the top quark can be measured within an uncertainty of 1 GeV.