Top Quark Mass Measurement in the Lepton + Jets Channel Using a Matrix Element Method and in situ Jet Energy Calibration

TL;DR

This paper reports a precise measurement of the top quark mass using a matrix element method with in situ jet energy calibration on Tevatron data, achieving a result of 173.0 GeV/c^2 with 1.2 GeV/c^2 uncertainty.

Contribution

It introduces a novel matrix element method combined with in situ jet energy scale calibration for top quark mass measurement.

Findings

Measured top quark mass: 173.0 GeV/c^2

Uncertainty: 1.2 GeV/c^2

Used 1087 ttbar events

Abstract

A precision measurement of the top quark mass m_t is obtained using a sample of ttbar events from ppbar collisions at the Fermilab Tevatron with the CDF II detector. Selected events require an electron or muon, large missing transverse energy, and exactly four high-energy jets, at least one of which is tagged as coming from a b quark. A likelihood is calculated using a matrix element method with quasi-Monte Carlo integration taking into account finite detector resolution and jet mass effects. The event likelihood is a function of m_t and a parameter DJES to calibrate the jet energy scale /in situ/. Using a total of 1087 events, a value of m_t = 173.0 +/- 1.2 GeV/c^2 is measured.