Particle Physics Seminar

Date: Wednesday 12^th March 2003

Title: Novel measurement of the mass of the top quark

Speaker: Professor Tom Ferbel,University of Rochester/ICSTM

Abstract
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An approach is being developed at DZero for extracting information from data through a direct comparison of all measured variables in an event with a matrix element that describes the entire production process. The method is exemplified in the extraction of the mass of the top quark in top-antitop events in the lepton+jets final state. Monte Carlo studies suggest that an improvement of almost a factor of two in statistical uncertainty on the mass of the top quark can be achieved relative to previously published work for this channel. Preliminary results from the re-analysis provide a reduction in the statistical uncertainty of almost a factor of 1.6, corresponding to an effective factor of 2.4 increase in the size of the data sample. (An almost comparable degree of improvement is also expected in the systematic uncertainty on the top mass.)