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Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF

Author(s)
CDF Collaboration; Bauer, Gerry P; Choudalakis, Georgios; Gomez-Ceballos, Guillelmo; Hahn, Kristian Allan; Makhoul, Khaldoun; Paus, Christoph M. E.; Xie, Si; Henderson, C.; Knuteson, Bruce O.; ... Show more Show less
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Abstract
We report a measurement of the top-quark mass Mt in the dilepton decay channel tt̄→bl′+νl′b̄l-ν̄l. 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 2.0fb-1 of pp̄ collisions collected with the CDF II detector, yielding a measurement of Mt=171.2±2.7(stat)±2.9(syst)GeV/c2.
Date issued
2009-04
URI
http://hdl.handle.net/1721.1/114680
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaltonen, T. et al. “Measurement of the Top-Quark Mass with Dilepton Events Selected Using Neuroevolution at CDF.” Physical Review Letters 102, 15 (April 2009): 152001 © 2009 The American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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