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

Journal Article · Fri Apr 17 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.152001· OSTI ID:21180375

Aaltonen, T; Maki, T; Mehtala, P; Orava, R; Osterberg, K; Saarikko, H; Remortel, N van ^[1]; Adelman, J; Brubaker, E; Fedorko, W T; Grosso-Pilcher, C; Kim, Y K; Krop, D; Kwang, S; Paramonov, A A; Schmidt, M A; Shiraishi, S; Shochet, M; Wolfe, C; Yang, U K ^[2]

---

1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
2. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)

We report a measurement of the top-quark mass M{sub t} in the dilepton decay channel tt{yields}bl{sup '+}{nu}{sub l}{sup '}bl{sup -}{nu}{sub 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{sup -1} of pp 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}.

• OSTI ID: 21180375
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BIOLOGICAL MODELS
FERMILAB COLLIDER DETECTOR
GEV RANGE 100-1000
MASS
MATRIX ELEMENTS
NEURAL NETWORKS
PARTICLE DECAY
PARTICLE MODELS
PROBABILITY
PROTON-PROTON INTERACTIONS
T QUARKS