Measurement of the Top-Quark Mass in the All-Hadronic Channel using the full CDF data set

TL;DR

This paper measures the top-quark mass in the all-hadronic decay channel using the full CDF dataset, employing advanced multivariate techniques and simultaneous calibration to achieve a precise result.

Contribution

It presents a novel measurement of the top-quark mass using the complete CDF data set with improved background discrimination and jet-energy scale calibration.

Findings

Measured top-quark mass: 175.07 GeV/c^2

Uncertainty: approximately 1.2 GeV/c^2

Method improves precision over previous measurements

Abstract

The top-quark mass M_top is measured using top quark-antiquark pairs produced in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV and decaying into a fully hadronic final state. The full data set collected with the CDFII detector at the Fermilab Tevatron Collider, corresponding to an integrated luminosity of 9.3 fb-1, is used. Events are selected that have six to eight jets, at least one of which is identified as having originated from a b quark. In addition, a multivariate algorithm, containing multiple kinematic variables as inputs, is used to discriminate signal events from background events due to QCD multijet production. Templates for the reconstructed top-quark mass are combined in a likelihood fit to measure M_top with a simultaneous calibration of the jet-energy scale. A value of M_top = 175.07+- 1.19(stat)+1.55-1.58(syst) GeV/c^2 is obtained for the top-quark mass.