We present a new preliminary measurement of the t \bart
production cross section in the dilepton channel with Run 2
data. The measurement was made by the CDF experiment in
proton-antiproton collisions at a center-of-mass energy of
1.96 TeV at the Fermilab Tevatron. The results are compared
to theoretical predictions and to previous measurements
which used Tevatron Run 1 data.
[H14.002] Study of Standard Model processes with a final state of two high-P_T leptons, large Missing Energy, and at least 2 high-E_T jets at CDF
Jong-Young Chung (The Ohio State University), CDF Collaboration
Within the context of the Standard Model, the only processes
which contribute to a final state of 2 high-P_T
electrons or muons, large missing transverse energy, and at
least 2 jets, are t \bar t, Z \rightarrow \tau \tau,
WW, and Drell-Yan. Using Monte Carlo studies, we discuss
each of these processes, and estimate their relative
contributions at CDF for Run 2 of the Fermilab Tevatron.
[H14.003] Measurement of the t\bart production cross section in the dilepton decay channels in p\barp collisions at \sqrts=1.96 GeV
V. Abazov et al. (DZero Collaboration), DZero Collaboration
We present preliminary results on the measurement of the
t\bart production cross section from the decay channels
where both W's decay leptonically. We use data collected
with the DO detector during Run II of the Fermilab
Tevatron p\barp collider.
[H14.004] Measurement of the tøverlinet cross section in the dielectron channel at the DO experiment in Run\simII of the Tevatron.
Joseph Kozminski (Michigan State University), DZero Collaboration
A preliminary study of the tøverlinet cross section in
the dielectron channel in data collected by the DO
detector at the Tevatron is discussed. An expected event
yield and an estimate of physics and instrumental
backgrounds are presented and compared to data gathered in
2002.
[H14.005] Measurement of the t\bart cross section in the dimuon channel at the DO experiment in Run\simII of the Fermilab Tevatron.
Jeff Temple (University of Arizona), DZero Collaboration
We present a preliminary study of the t\bart cross
section in the dimuon channel using data collected by DO
experiment. Selection critera, particle identification,
trigger efficiencies, and background contributions for this
channel are discussed.
[H14.006] Measurement of the t\bart production cross section in the electron and muon channel at the DO experiment at Run\simII of the Tevatron.
Daniel Whiteson (University of California at Berkeley), DZero Collaboration
A study of the production cross section for t\bart pairs
and the branching ratio to an electron, a muon and two
b-quark jets is presented. Sources of instrumental and
physics backgrounds are discussed.
[H14.007] Measurement of t \bart Production Cross Section at the Tevatron Run 2 CDF Experiment Using B-Tagging.
Henri Bachacou (Lawrence Berkeley National Laboratory), CDF Collaboration
We present a preliminary measurement of the inclusive cross
section for the production of t \bart pairs in the
collisions of protons and anti-protons at 1.96 TeV at CDF,
using the data accumulated so far during Tevatron Run 2. The
measurement uses t \bart decays into final states which
contain one high transverse momentum lepton and multiple
jets, where one of the jets is required to be identified as
a b jet candidate by reconstructing secondary vertices
from b-quark decay using the SVXII Silicon Vertex
detector.
[H14.008] Measurement of \sigma(p\barp \to t\bartX) in the lepton plus jets decay mode using a neural network
Radu Marginean (The Ohio State University), CDF Collaboration
We measure the production cross-section for t\bart pairs
in p\barp collisions at \sqrts = 1.96 TeV at the
Fermilab Tevatron, using data collected by the CDF
experiment. Top quarks are identified by the "lepton plus
jets" signature -- each top quark decays to Wb, one W
decays to a lepton and neutrino, and the other W decays to
a q\barq pair. We separate the t\bart signal from
W plus QCD background on the basis of a neural network. We
compare our measurement to previous results, and give
prospects for improvements with larger datasets.
[H14.009] Measurement of the t\bart production cross section in the lepton+jets decay channels in p\barp collisions at \sqrts=1.96 GeV
V. Abazov et al. (DZero Collaboration), DZero Collaboration
We present preliminary results on the measurement of the
t\bart production cross section from two independent
lepton+jets decay channels, where the lepton is either an
electron or a muon, using the Run II data collected with the
DØ\ detector at the Fermilab Tevatron p\barp collider.
[H14.010] Measurement of the t\bart cross section in the lepton+jets channel at the DO experiment in Run\simII of the Tevatron.
Tobias Golling (Bonn University), DZero Collaboration
A measurement of the t\bart~\rightarrow charged lepton +
neutrino + jets cross section is presented using data taken
during Run~II by the DØ\ detector at the Fermilab Tevatron.
The measurement proceeds by detecting all particles in the
final state, which are a lepton and a neutrino from the W
decay, two jets from the second W decay, and two b-jets.
The leptons considered in this analysis are electrons and
muons. Electrons and jets are identified by the Liquid Argon
calorimeter. Muons are identified by the upgraded muon
system, and their momentum measured with the new DØ\
central tracking system. b-jets are identified by either a
displaced vertex or a soft lepton accompanying the jet.
[H14.011] Measurement of the t\bart cross section in the e+jets channel using the matrix element method.
Chunhui Han (University of Michigan), DZero Collaboration
Previous t\bart cross section measurements in hadron colliders use a reduced set of kinematic information to discriminate signals from background events. Here we present a new approach to measure the cross section, using the full kinematic information of each event. We construct a discriminator from the matrix element which describes the signal process, and the one which describes the background process, and then plot the discriminator distributions for signal and background events respectively, using MC samples. The fraction of signal events in the data sample will be extracted by fitting the data to the distribution plots. The result of the application of this method to the DO Run\simII data sample is presented.