Top Quark Mass Measurement Using a Matrix Element Method with Quasi-Monte Carlo Integration

TL;DR

This paper presents an updated measurement of the top quark mass using a matrix element method with Quasi-Monte Carlo integration, analyzing collision data from the Fermilab Tevatron with improved background discrimination.

Contribution

It introduces a matrix element integration approach combined with neural network background identification for precise top quark mass measurement.

Findings

Measured top quark mass as 172.2 GeV/c^2 with total uncertainty of 1.7 GeV/c^2.

Used 2.7 fb^-1 of data and identified 422 events passing all cuts.

Achieved improved precision over previous measurements.

Abstract

We report an updated measurement of the top quark mass obtained from ppbar collisions at sqrt(s) = 1.96 TeV at the Fermilab Tevatron using the CDF II detector. Our measurement uses a matrix element integration method to obtain a signal likelihood, with a neural network used to identify background events and a likelihood cut applied to reduce the effect of badly reconstructed events. We use a 2.7 fb^-1 sample and observe 422 events passing all of our cuts. We find m_t = 172.2 +/- 1.0 (stat.) +/- 0.9 (JES) +/- 1.0 (syst.) GeV/c^2, or m_t = 172.2 +/- 1.7 (total) GeV/c^2.