Measurements of the top-quark mass using charged particle tracking

TL;DR

This paper reports three measurements of the top-quark mass using methods with minimal dependence on jet energy scale, combining decay length and lepton momentum data to improve accuracy.

Contribution

It introduces novel measurements of the top-quark mass utilizing charged particle tracking techniques that reduce reliance on jet energy calibration.

Findings

Measured top-quark mass as 166.9 GeV/c2 from decay length

Measured top-quark mass as 173.5 GeV/c2 from lepton momentum

Combined measurement yields 170.7 GeV/c2 with improved precision

Abstract

We present three measurements of the top-quark mass in the lepton plus jets channel with approximately 1.9 fb-1 of integrated luminosity collected with the CDF II detector using quantities with minimal dependence on the jet energy scale. One measurement exploits the transverse decay length of b-tagged jets to determine a top-quark mass of 166.9+9.5-8.5 (stat) +/- 2.9 (syst) GeV/c2, and another the transverse momentum of electrons and muons from W-boson decays to determine a top-quark mass of 173.5+8.8-8.9 (stat) +/- 3.8 (syst) GeV/c2. These quantities are combined in a third, simultaneous mass measurement to determine a top-quark mass of 170.7 +/- 6.3 (stat) +/- 2.6 (syst) GeV/c2.