First simultaneous measurement of the top quark mass in the lepton+jets and dilepton channels at CDF

Journal Article · Fri May 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.092005· OSTI ID:21308394

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

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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 present a measurement of the mass of the top quark using data corresponding to an integrated luminosity of 1.9 fb{sup -1} of pp collisions collected at {radical}(s)=1.96 TeV with the CDF II detector at Fermilab's Tevatron. This is the first measurement of the top quark mass using top-antitop pair candidate events in the lepton+jets and dilepton decay channels simultaneously. We reconstruct two observables in each channel and use a nonparametric kernel density estimation technique to derive two-dimensional probability density functions from simulated signal and background samples. The observables are the top quark mass and the invariant mass of two jets from the W decay in the lepton+jets channel, and the top quark mass and the scalar sum of transverse energy of the event in the dilepton channel. We perform a simultaneous fit for the top quark mass and the jet energy scale, which is constrained in situ by the hadronic W boson mass. Using 332 lepton+jets candidate events and 144 dilepton candidate events, we measure the top quark mass to be M{sub top}=171.9{+-}1.7(stat+JES){+-}1.1(other syst) GeV/c{sup 2}=171.9{+-}2.0 GeV/c{sup 2}.

• OSTI ID: 21308394
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DENSITY
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
HADRONS
LEPTONS
LUMINOSITY
MASS
PARTICLE DECAY
PROBABILITY DENSITY FUNCTIONS
PROTON-PROTON INTERACTIONS
SIMULATION
T QUARKS
TEV RANGE 01-10
TRANSVERSE ENERGY
TWO-DIMENSIONAL CALCULATIONS
W MINUS BOSONS
W PLUS BOSONS