Measurement of the Top Quark Mass in the All-Hadronic Mode at CDF
CDF Collaboration : T. Aaltonen, B. \'Alvarez Gonz\'alez, S. Amerio,, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, J. A. Appel, T., Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, B. Auerbach, A. Aurisano, F., Azfar, W. Badgett, T. Bae, A. Barbaro-Galtieri
TL;DR
This paper reports a precise measurement of the top quark mass in the all-hadronic decay channel using data from the CDF II detector, employing neural networks and likelihood fitting to achieve high accuracy.
Contribution
It introduces a novel measurement technique combining neural network event selection with a simultaneous likelihood fit for top mass and jet energy scale calibration.
Findings
Measured top quark mass: 172.5 GeV/c^2
Total uncertainty: approximately 1.8 GeV/c^2
Method improves precision over previous measurements
Abstract
We present a measurement of the top quark mass (Mtop) in the all-hadronic decay channel using 5.8 fb^{-1} of proton-antiproton data collected with the CDF II detector at the Fermilab Tevatron Collider. Events with 6 to 8 jets are selected by a neural network algorithm and by the requirement that at least one of the jets is tagged as a b quark jet. The measurement is performed by a likelihood fit technique, which determines simultaneously Mtop and the jet energy scale (JES) calibration. The fit yields a value of 172.5 +- 1.4(stat) +-1.0(JES) +-1.1(syst) GeV/c^2.
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