Mr
Frederic Derue
(CNRS IN2P3 UPMC LPNHE (FR))
05/07/2012, 09:00
Track 4 - Top Quark Physics
Parallel Sessions
We present measurements of the production of top quarks in proton - proton collisions at 7 TeV with the ATLAS detector at the Large Hadron Collider. The cross section of pair - produced top quarks is measured in several channels, including the single lepton, dilepton, all hadronic channel, some using information from b-tagging, as well as channels involving tau leptons.
Dr
Ana Rodriguez Marrero
(Universidad de Cantabria (ES))
05/07/2012, 09:15
Track 4 - Top Quark Physics
Parallel Sessions
Precision measurements are presented of the top-pair production cross section in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The data are collected with the CMS experiment during the year 2011. The measurements are performed in several decay channels, the lepton+jets, the dilepton and the fully hadronic channels, including the tau-dilepton and tau+jets modes. B-jet...
Dr
Taylor Childers
(CERN (CH))
05/07/2012, 09:30
Track 4 - Top Quark Physics
Parallel Sessions
After having established the ttbar production mechanism at LHC, interest is now focused on differential spectra of ttbar. Latest measurements performed in 7 TeV proton - proton collisions with the ATLAS detector at the Large Hadron Collider will be presented.
Dr
Maria Aldaya Martin
(Deutsches Elektronen-Synchrotron (DE))
05/07/2012, 09:45
Track 4 - Top Quark Physics
Parallel Sessions
We present measurements of various differential cross sections in top pair production in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. The data are collected by the CMS experiment during the year 2011. Cross sections are measured differentially as a function of various variables, including the transverse momentum and rapidity of the (anti)top quark and the...
Mr
Matteo Corbo
(Fermi National Accelerator Laboratory (US))
05/07/2012, 10:00
Track 4 - Top Quark Physics
Parallel Sessions
The cross section for top-quark production, either in pairs through chromo-dynamical mechanisms or in single top-quarks through electro-weak based mechanisms, is a topic of great interest for testing theoretical predictions and constraining standard model parameters, as well as for searching for new physics in the top-quark sector. We present recent measurements of the top-quark pair...
Dr
Peter Marquard
(KIT (DE))
05/07/2012, 10:15
Track 4 - Top Quark Physics
Parallel Sessions
We present new results for the matching coefficient between the QCD and the non-relativistic QCD (NRQCD) vector current. The matching coefficient constitutes one of the missing ingredients for a complete NNNLO theory prediction of top-quark pair production at a future linear collider. Furthermore, the matching coefficient is an important building block for the analysis of heavy quarkonia,...
Prof.
Christian Schwanenberger
(University of Manchester)
05/07/2012, 11:00
Track 4 - Top Quark Physics
Parallel Sessions
We present measurements of the inclusive top quark pair production cross section in various final states including electrons, muons, tau leptons, large missing transverse energy, b-tagged and light flavor jets. We also show measurements of differential distributions of top quarks produced in pairs which provides a unique test of the dynamics of a heavy diquark system at large scales and...
Mr
Philipp Sturm
(Bergische Universitรคt Wuppertal (DE))
05/07/2012, 11:15
Track 4 - Top Quark Physics
Parallel Sessions
We present the result of measurements of single top - quark production in the t - and Wt - channels at 7 TeV proton - proton collisions with the ATL AS detector at the Large Hadron Collider. Information on the CKM matrix element |Vtb| is extracted from these measurements.
Dr
Gabriele Benelli
(University of Kansas (US))
05/07/2012, 11:30
Track 4 - Top Quark Physics
Parallel Sessions
We present measurements of single top quark production, performed using CMS data collected in 2010-2011 at a centre-of-mass energy of 7 TeV. The cross section for the electroweak production of single top quarks is measured in the t-channel using various methods. The combined result is used to place a constraint on the CKM matrix element Vtb. The data sample analyzed allows to study also...
Dr
Yvonne Peters
(University of Gรถttingen & DESY (DE))
05/07/2012, 11:45
Track 4 - Top Quark Physics
Parallel Sessions
We present measurements of production cross sections of single top quarks in ppbar collisions at sqrt(s) = 1.96 TeV using data collected with the CDF and D0 experiments with integrated luminosities of up to 9.7 fb-1. Measurements of the total production cross section and of the t-channel cross section are presented, as well as searches for the s-channel production process. These measurements...
Dr
Giuseppe Salamanna
(University of London (UK))
05/07/2012, 12:00
Track 4 - Top Quark Physics
Parallel Sessions
We present measurements of the top - quark mass in proton - proton collisions at 7 TeV with the ATLAS detector at the Large Hadron Collider. The top mass is determined by making use of a two - dimensional template method in the single lepton channel, and a one - dimensional template method in the all - hadronic channel. An indirect extraction of the top - quark mass from the measurement...
Dr
Hartmut Stadie
(Hamburg University (DE))
05/07/2012, 12:15
Track 4 - Top Quark Physics
Parallel Sessions
The mass of the top quark is a fundamental parameter of the Standard Model. Measurements of the top quark mass are presented using data collected by the CMS experiment during the year 2011, in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. Different reconstruction methods to extract the top quark mass are employed. The results of the various channels are combined and...
Mr
Gerrit Van Onsem
(Vrije Universiteit Brussel (BE))
05/07/2012, 12:30
Track 4 - Top Quark Physics
Parallel Sessions
A measurement of the difference between the masses of top and anti-top quarks is presented using data collected by the CMS experiment during the year 2011, in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. Events from the l+jets channel are selected by requiring one lepton and at least four jets in the final state. The measured value is compared with the prediction...
Dr
Hyun Su Lee
(Ewha Womans University)
05/07/2012, 14:00
Track 4 - Top Quark Physics
Parallel Sessions
The top-quark mass is an important parameter of the standard model. It is used, along with the W boson mass, to constrain the mass of the predicted Higgs boson. We present measurements of the top-quark mass and of the top-antitop mass difference, which tests the CPT symmetry, in the semi-leptonic top-quark pair decay channel using the template method and the full CDF Run II sample. These are...
Dr
Oleg Brandt
(University of Gรถttingen (DE))
05/07/2012, 14:15
Track 4 - Top Quark Physics
Parallel Sessions
The mass of the top quark is a fundamental parameter of the standard model and has to be determined experimentally. The D0 experiment at the Fermilab Tevatron proton-antiproton collider with a centre-of-mass energy of 1.96 TeV has measured the top quark in various channels. We present the most recent measurements of the top quark mass in the dilepton and lepton+jets channels with up to 5.3...
Dr
Frederic Deliot
(CEA - Centre d'Etudes de Saclay (FR))
05/07/2012, 14:30
Track 4 - Top Quark Physics
Parallel Sessions
The top quark is the heaviest known elementary particle and its mass is a free parameter of the Standard Model. The CDF and D0 collaborations have previously measured the top quark's mass using the top quark pairs produced at the Tevatron proton-antiproton collider in many decay channels. We present here the combination of all published measurements with an integrated luminosity up to 5.8...
Dr
Marcel Vos
(Universidad de Valencia (ES))
05/07/2012, 14:45
Track 4 - Top Quark Physics
Parallel Sessions
The top quark is the heaviest particle of the Standard Model and, thus, the particle most strongly coupled to the physics of electroweak symmetry breaking. A future linear e+e- collider will be able to make precision measurements of the top quark mass and width, of the detailed QCD physics of the top quark threshold, and of the top quark production and decay asymmetries. Both measurements at...
Dr
Markus Jรผngst
(CERN)
05/07/2012, 15:00
Track 4 - Top Quark Physics
Parallel Sessions
n 7 TeV proton - proton collisions at the LHC, pairs of top and anti-top quarks are expected to be mostly produced through gluon fusion, in contrast to production at the Tevatron, where quark annihilation dominates. The ATLAS experiment has now recorded a large number of top quark pairs, allowing this domain to be explored in detail. We present measurements of the spin correlation between top...
Dr
Suharyo Sumowidagdo
(University of California Riverside (US))
05/07/2012, 15:15
Track 4 - Top Quark Physics
Parallel Sessions
Measurement of the polarisation of W bosons and top anti-top spin correlations in top-quark decays are presented. The analysis makes use of top-pair events in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV using data collected by the CMS experiment during the year 2011. Final states are selected where one of the two W bosons decays into electron-neutrino or...
Dr
Yvonne Peters
(University of Gรถttingen & DESY)
05/07/2012, 16:00
Track 4 - Top Quark Physics
Parallel Sessions
We present a measurement of the ratio of events with correlated t and tbar spins to the total number of ttbar events. This ratio f is evaluated using a matrix-element-based approach in events with a single lepton (electron or muon) and at least four jets and in events with two leptons (ee, emu, mumu) and at least two jets. We analyze ppbar collisions data corresponding to an integrated...
Prof.
Christian Schwanenberger
(University of Manchester (UK))
05/07/2012, 16:15
Track 4 - Top Quark Physics
Parallel Sessions
We present a measurement of the electric charge of the top quark and an improved determination of the total width of the top quark, Gamma_t, using 5.3 fb-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron ppbar Collider. The top quark charge is reconstructed from the top quark decay products in events which have an isolated high-pT charged lepton, large missing...
Prof.
Erich Ward Varnes
(University of Arizona (US))
05/07/2012, 16:30
Track 4 - Top Quark Physics
Parallel Sessions
We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7 โ 5.4 fbโ1 of ppbar collisions collected during Run II of the Fermilab Tevatron Collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f0)...
Dr
Antonio Limosani
(University of Melbourne (AU))
05/07/2012, 16:45
Track 4 - Top Quark Physics
Parallel Sessions
Other properties of top quarks as measured with the ATLAS detector, using pp collisions at a center-of-mass energy of 7 TeV, are presented. In particular the charge of the quark is determined to be +2/3 as predicted by the Standard Model, while an exotic charge is excluded. The cross-section of additional photon radiation in top quark pairs is also measured and presented in this talk.
Ms
Yvonne Kรผssel
(RWTH-Aachen (DE))
05/07/2012, 17:00
Track 4 - Top Quark Physics
Parallel Sessions
Measurement of top quark properties, such as the top quark charge and the flavour contents in top quark pair events is presented using proton-proton collision data recorded with the CMS Experiment at the LHC at a centre-of-mass energy of 7 TeV. For the measurement of the top quark charge, the top quark pair events are reconstructed in the muon+jets final state and different top quark charge...
Dr
Youngdo Oh
(Kyungpook National University (KR))
05/07/2012, 17:15
Track 4 - Top Quark Physics
Parallel Sessions
The top-quark properties are of special interest for testing standard model predictions and for indirect searches for new physics due to the large mass of the top-quark, probing very short distances, and its uniquely short life time, eliminating hadronization complexities. We present recent measurements of the top-quark decay branching ratio, constraining the |V_tb| matrix element of the CKM...
