Top quark mass measurements at CDF
We report the results of the measurements of the top quark mass in
the lepton+jet, dilepton, and all-jets channels using top pair events
corresponding to an integrated luminosity of 3 fb-1 from proton-
antiproton collisions at the Tevatron recorded by the CDF II
detector. We present different results using different techniques in
the lepton + jets, dilepton, all-jets channels and describe the
current status of the systematic uncertainties.
|
Top quark mass: latest CDF results, Tevatron combinations, and electroweak implications
We present results on the precision measurement of the top quark mass
and a combination of the best CDF top mass measurements. We present
also a combination by the TevEWWG (Tevatron electroweak working
group) of the best top mass results from CDF and D0 in Run 1 and Run
2 of the Tevatron. This result is the current world average, and
offers an uncertainty less than 1%. The new mass value has been
included in traditional LEP EWWG fits to precision electroweak data,
and implications for the Standard Model Higgs have been derived.
|
Properties of the top quark
More than a decade after its discovery we are still trying to find
out more about the nature of the top quark. The current statistics of
the Tevatron allow us to make stringent tests. In this talk we will
present state of the art measurements of top quark properties. By
studying rates and distributions sensitive to the production and
decay mechanisms of top quarks, we can search for contamination from
non-standard model particles, or subtle differences in the
electroweak or strong interactions that govern top quark
interactions. We will present the most recent and precise
measurements of the properties of the top quark such charge,
lifetime, width, and more done by the CDF experiment at Fermilab.
|
Measurement of the single top production cross section at CDF
We present the most precise measurement of electroweak single top
quark production by the CDF experiment. Candidate events are selected
for further classification by four parallel analysis techniques: one
using a likelihood discriminant, one using a matrix-element
discriminant, one using decision trees, and one using a neural
network. The results of these four analyses are combined in order to
improve the expected sensitivity. We also present the most current
value of the CKM matrix element Vtb.
|
Searches for top-like objects
Recent results on searches at CDF for beyond the standard model
processes that exhibit top-like behavior are reviewed. Many models
such as little Higgs, beautiful mirrors, contain a 4-th generation
top like quark with masses that could be accessible at the Tevatron.
Constrains from baryo-genesis indicate that SUSY stop could be
lighter than the top quark. Such stop signatures can be very similar
to those from top events. Searches for top prime and stop particles
using data up to 3fb-1 will be presented.
|
Searches for new physics hidden in the top sector
Recent results on searches for beyond the standard model at CDF are
reviewed. In the searches presented in this talk, top quark pair
production or decay is scrutinized for signs of new physics hidden in
the top sector. The analyses presented include searches for flavor
changing neutral currents in top decay, searches for W? as well as
searching for resonances in the mass distribution of the top-quark
pairs. Most of the analyses presented use data up 3 fb-1.
|
Measurement of the front back asymmetry in top-antitop quark pairs at
CDF
A method of reconstructing t-tbar events in the lepton plus jets mode
is applied to a measurement of the forward backward asymmetry in t-
tbar pair production at CDF. The measurement is a test of discrete
symmetries in t-tbar production and strong interactions at large
Q^2. In the present data set it is potentially sensitive to the
presence of parity-violating production channels such as a massive Z'-
like boson or new physics within strong interactions. We present a
measurement of the top quark forward-backward asymmetry in two
complimentary rest frames: the proton anti-proton frame and the top
anti-top frame.
|
Measurements of the W helicity in top decays at CDF
CDF has tested the V-A nature of the weak interaction with three
measurements of the transverse polarization of W bosons from top
decays. The measurement is made using 3 fb-1 of ppbar collision data
at the Tevatron collider at Fermilab. Using different analyses we
have set the most stringent limits on the existence of V+A coupling
in top decays, which is predicted by some models of new physics.
|
Measurements of the top pair production cross section at CDF
The top quark is the heaviest particle yet observed. With the
possibility for the massive top to couple to new physics at high
energy scales, CDF has many complementary analyses in each top decay
channel which provide strong tests of the standard model and physics
beyond. With the large 3 fb-1 dataset accumulated by CDF, we are
able to measure the top pair production rate with unprecedented
precision, and uncertainties comparable to those of theoretical
predictions. In this talk we present measurements of the top
production cross section in all the decay channels along with their
combined result.
|
Searches for resonant top-antitop production at CDF
We describe searches for resonant top-antitop production in 3fb-1 of 1.96 TeV
proton-antiproton collisions at the Tevatron, using data collected by the CDF
collaboration. Resonant top pair production could arise from the decays of
massive Z-like bosons in extended gauge theories, KK states of the gluon or Z,
axigluons, topcolor, and other BSM theories. We use different techniques to study
the top- antitop invariant mass spectrum and set model independent limits on
new resonant top- antitop production mechanisms that would appear as bumps
in invariant mass.
|
Top quark properties in the single top sample
Single top quark production offers a new source
of top quarks recently established at the Tevatron.
We present the most precise results on a separate search for
s-channel and t-channel single top quark production
as well as measurements of top quark properties
uniquely accessible in this new sample.
|
