Measurement of the top quark mass with dilepton events selected using neuroevolution at CDF

Journal Article · Tue Jul 01 04:00:00 EDT 2008 · Submitted to Phys.Rev.Lett.

DOI:https://doi.org/10.1103/PhysRevLett.100.062005· OSTI ID:940131

Aaltonen, T; Adelman, J; Akimoto, T; Albrow, M G; Alvarez Gonzalez, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G

We report a measurement of the top quark mass M{sub t} in the dilepton decay channel t{bar t} to b{ell}{prime}{sup +} {nu}{prime}{sub {ell}} {bar b}{ell}{sup -} {bar {nu}}{sub {ell}}. 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{sup -1} of p{bar p} collisions collected with the CDF II detector, yielding a measurement of M{sub t} = 171.2 {+-} 2.7(stat.) {+-} 2.9(syst.) GeV/c{sup 2}.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 940131
• Report Number(s): FERMILAB-PUB-08-369-E; arXiv eprint number arXiv:0807.4652
• Journal Information: Submitted to Phys.Rev.Lett., Journal Name: Submitted to Phys.Rev.Lett.
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BIOLOGICAL EVOLUTION
DECAY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
MATRIX ELEMENTS
NEURAL NETWORKS
PROBABILITY
RESOLUTION
T QUARKS