Measuring the Top Quark Mass using Kinematic Endpoints

TL;DR

This paper presents a measurement of the top quark mass using kinematic endpoints in dilepton decay events from CMS data, achieving high precision and constraining related particle masses.

Contribution

It introduces a method to simultaneously measure top quark, W boson, and neutrino masses using endpoint techniques in kinematic distributions.

Findings

Top quark mass measured as 173.9 GeV with uncertainties.

Method constrains W boson and neutrino masses.

Analysis uses 4.98 fb^{-1} of CMS data.

Abstract

We report on a simultaneous measurement of the top quark, W boson, and neutrino masses in $t\bar{t}$ dilepton decays with $4.98 \mathrm{fb}^{-1}$ of data from the CMS experiment. The analysis is based on endpoint determinations in kinematic distributions. In addition to the unconstrained fit for three masses, the neutrino and W boson masses can be constrained to standard values; in the maximally constrained fit, the top quark mass is found to be $M_t = 173.9 \pm 0.9 (stat) {}^{+1.2}_{-1.8} (syst) $ GeV.