Title
Measurement of the top-quark mass with dilepton events selected using neuroevolution at CDF Measurement of the top-quark mass with dilepton events selected using neuroevolution at CDF
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
102(2009) :15 , p. 152001,1-152001,8
ISSN
0031-9007
ISI
000265285700016
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We report a measurement of the top-quark mass Mt in the dilepton decay channel tt̅ →bl′+νl′b̅ l-ν̅ l. Events are selected with a neural network which has been directly optimized for statistical precision in top-quark mass using neuroevolution, a technique modeled on biological evolution. The top-quark mass is extracted from per-event probability densities that are formed by the convolution of leading order matrix elements and detector resolution functions. The joint probability is the product of the probability densities from 344 candidate events in 2.0  fb-1 of pp̅ collisions collected with the CDF II detector, yielding a measurement of Mt=171.2±2.7(stat)±2.9(syst)  GeV/c2.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/2ae21c/312b9e73.pdf
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