Top Quark Mass Measurement using mT2 in the Dilepton Channel at CDF

TL;DR

This paper introduces a novel application of the mT2 variable for measuring the top quark mass in dilepton events at a hadron collider, achieving results consistent with previous methods and demonstrating the technique's potential.

Contribution

It is the first to apply the mT2 variable for top quark mass measurement at a hadron collider, combining it with other methods for improved accuracy.

Findings

Measured top quark mass as 168.0^{+4.8}_{-4.0} (stat) ± 2.9 (syst) GeV/c^2 using mT2.

Combined mT2 with neutrino weighting method to obtain 169.3 ± 2.7 (stat) ± 3.2 (syst) GeV/c^2.

First application of mT2 in a hadron collider mass measurement.

Abstract

We present measurements of the top quark mass using the \mT2, a variable related to the transverse mass in events with two missing particles. We use the template method applied to t\tbar dilepton events produced in p\pbar collisions at Fermilab's Tevatron and collected by the CDF detector. From a data sample corresponding to an integrated luminosity of 3.4 \invfb, we select 236 t\tbar candidate events. Using the \mT2 distribution, we measure the top quark mass to be M_{Top} = 168.0^{+4.8}_{-4.0} $\pm$ {2.9} GeV/c^{2}. By combining the \mT2 with the reconstructed top mass distributions based on a neutrino weighting method, we measure M_{top}=169.3 $\pm$ 2.7 $\pm$ 3.2 GeV/c^{2}. This is the first application of the \mT2 variable in a mass measurement at a hadron collider.