ICEPP SEMINAR 2003

講演者	Prof. Tom. Ferbel
	(University of Rochester and Imperial College)
日時:	平成15年1月17日(金) / 16:30-18:30

Abstract
 
An approach is being develped 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
proxess. The method is exemplified in the extraction of the mass of
the top qurark 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 alomost a factor of 1.6, corresponding to 
an effective factor of 2.4 increase in the size of the data sample.