Prof.
Wieslaw Placzek
(Marian Smoluchowski Institute of Physics, Jagiellonian University)
16/07/2009, 09:00
Standard Model Electroweak Physics
The charged-current Drell-Yan process, i.e. single W-boson production with leptonic decays in hadronic collisions, will play an important role in the experimental programme at the LHC. It will be used for improved measurements of some Standard Model parameters (such as the W-boson mass and widths, etc.), for better determination of the Higgs-boson mass limits, in "new physics' searches, as a...
Dr
Alexander Mueck
(Paul Scherrer Institut)
16/07/2009, 09:18
Standard Model Electroweak Physics
We present the first calculation of the next-to-leading order electroweak corrections to W-boson + jet hadroproduction including leptonic W-boson decays. The W-boson resonance is treated consistently using the complex-mass scheme and all off-shell effects are taken into account. The corresponding next-to-leading order QCD corrections have also been recalculated. All the results have been...
Dr
Krzysztof Sliwa
(Tufts University)
16/07/2009, 09:36
Standard Model Electroweak Physics
Precise studies of distributions and asymmetries in W and Z production offer constraints on the parton content of protons. Improving the knowledge of parton content can help avoid systematic limitations in measuring the mass of the W boson. Measurements of Z rapidity and W charge asymmetry in fb-1 samples are presented.
Dr
David Khatidze
(Brown University)
16/07/2009, 09:54
Standard Model Electroweak Physics
We present measurements conducted at D0 that involve W and Z boson production. The talk includes the measurement of the W charge asymmetry where W decays into an electron and a neutrino; a study of Z at low momentum where Z decays into electrons or muons, done using a novel technique; and precise measurement of the forward-backward asymmetry in both di-muon and di-electron channels.
Dr
Aristotelis Kyriakis
(NCSR Demokritos)
16/07/2009, 10:12
Standard Model Electroweak Physics
The LHC is a discovery machine. Both CMS and ATLAS detectors are ready for collecting the first data from the pp collisions. Electroweak measurements is an important tool to demonstrate the detectors physics performance and to understand new physics scenarios since W & Z bosons are the building block of some of them . This talk is focused in the study of the W & Z boson production with the...
Dr
Sandro Uccirati
(TTP Karlsruhe)
16/07/2009, 11:00
Standard Model Electroweak Physics
The high energy behaviour of electroweak corrections to gauge boson pair production at LHC is presented. Using the evolution equation approach, the logarithmically enhanced contributions up to NNLL to all order in perturbation theory are derived. On the basis of this result the two-loop NNLL for partonic and hadronic cross section are obtained. Explicit results for W-pair production are presented.
Dr
Joseph Haley
(For the D0 Collaboration)
16/07/2009, 11:18
Standard Model Electroweak Physics
We present recent diboson production measurements from the D0 experiment at Fermilab's Tevatron collider. The production of ZZ has been observed using leptonic final states. Zgamma production has been observed and used to set the most stringent limits from a hadron collider on anomalous Zgammagamma and ZZgamma trilinear gauge couplings (TGCs). WW and WZ events with semi-leptonic final...
Ms
Viviana Cavaliere
(CDF Collaboration, INFN Pisa, University of Siena)
16/07/2009, 11:36
Standard Model Electroweak Physics
WW and WZ production in pbar p collisions at 1.96 TeV are studied in samples of ~3 fb-1 of data using leptons, jets and missing Et. Fully leptonic decays as well as semi-leptonic decays are measured. Diboson production is expected in the standard model, and predicted cross sections are confirmed. It is important to investigate various signatures as associated production of Higgs bosons is...
Dr
Eyal Brodet
(Tel-Aviv University)
16/07/2009, 11:54
Standard Model Electroweak Physics
Di-Gauge Boson in the LHC will be discussed. The measurements of cross sections and triple gauge couplings(TGC) at early stage of data taking will be described as well as di-boson polarization and TGC at high luminosity. The selection for the cross section measurements will be shown as well as the transverse mass variable used for the WW TGC measurement. A comparison between LHC limits and...
Prof.
Krzysztof Piotrzkowski
(UCLouvain)
16/07/2009, 12:12
Standard Model Electroweak Physics
The exclusive two-photon production at the LHC of pairs of W and Z bosons provides a novel and unique test-ground for the electroweak gauge boson sector. In particular it offers, thanks to high gamma-gamma center-of-mass energies, large and direct sensitivity to the anomalous quartic gauge couplings otherwise very difficult to investigate at the LHC. An initial analysis has been performed...
Dr
Andrea Ferroglia
(Johannes Gutenberg Univestitaet Mainz)
16/07/2009, 14:30
Standard Model Electroweak Physics
The study of the properties of the top quark is one of the main goals of the Large Hadron Collider (LHC) physics program. The experimental precision expected at the LHC requires the knowledge of several top-quark related observables beyond leading order in the strong coupling constant. In this talk I briefly review the status of the theoretical predictions for the top-quark production...
Dr
Sebastien GREDER
(IPHC, Strasbourg, France)
16/07/2009, 14:55
Standard Model Electroweak Physics
We present the measurement of the top anti-top quark pair production
cross section in dilepton, lepton+jets and tau+lepton final states
using up to 4 fb^-1 of data collected with the D0 detector at the
Fermilab Tevatron collider. We also present the combination of these
channels and extract the top quark mass comparing the measured cross
section to calculations in higher order QCD....
Dr
Alison Lister
(University of Geneva)
16/07/2009, 15:13
Standard Model Electroweak Physics
With the large dataset accumulated by CDF (more than 3 fb-1), we are able to make stringent tests on the properties of top quark. By studying production 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...
Dr
Luca Fiorini
(IFAE)
16/07/2009, 15:31
Standard Model Electroweak Physics
The top quark will be a fundamental element of the early physics program at the Large Hadron Collider (LHC). The LHC unparalleled energy of the proton-proton collisions and large top quark production may provide an improved reach in several top quark measurements.
We will show the expected performance of the ATLAS and CMS experiments with a focus on the early measurements of the top pair and...
Dr
Lorenzo Bellagamba
(INFN Bologna)
16/07/2009, 15:49
Standard Model Electroweak Physics
Searches for single-top production at the $ep$ collider HERA has been
performed using data collected by the H1 and ZEUS Collaborations.
The H1 collaboration analyzed the full HERA data sample
corresponding to an integrated luminosity of 474 pb^-1 looking
both at the leptonic and hadronic decay of the W coming from top decay.
The ZEUS collaboration analyzed data collected in the running...
Mr
Bruno Casal Laraña
(Instituto de Fisica de Cantabria (CSIC - U. Cantabria))
16/07/2009, 16:30
Standard Model Electroweak Physics
We present observation of electroweak single top quark production using 3.2 fb-1 of data collected by the CDF experiment. Candidate events are selected for further classification by five parallel analysis techniques: one using a likelihood discriminant, one using a matrix-element discriminant, one using decision trees, one using a neural network, and one using a complementary dataset. The...
Reinhard Schwienhorst
(Michigan State University), Prof.
Reinhard Schwienhorst
(Michigan State University)
16/07/2009, 16:45
Standard Model Electroweak Physics
We report first observation of the electroweak production of single top quarks in ppbar collisions at sqrt(s) = 1.96 TeV based on 2.3 fb^-1 of data collected by the D0 detector at the Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from the fragmentation of b quarks, we measure a cross section of...
Prof.
Robin Erbacher
(Univ. of California, Davis)
16/07/2009, 17:00
Standard Model Electroweak Physics
Fifteen years following the first glimpses of the top quark at Fermilab's Tevatron, physicists are now able to explore top quark physics with substantial precision. With 40 times the data of Run 1, we are learning much about the nature of this peculiarly heavy quark, and we are looking for hints of physics beyond the Standard Model in the top quark sector. We present exciting new results on...
Dr
Yvonne Peters
(University of Manchester)
16/07/2009, 17:20
Standard Model Electroweak Physics
The top quark is the heaviest elementary particle known today. It is
therefore an excellent candidate to search for new physics. We present
searches for physics beyond the Standard Model involving top
quarks. The analysed data corresponds to up to 4 fb^-1 of integrated
luminosity, collected by the D0 detector at the Femilab Tevatron
collider. We present various searches for new physics in...
Pedro Ferreira da Silva
(LIP / CMS)
16/07/2009, 17:40
Standard Model Electroweak Physics
The top quark is the only known fermion with a mass of the order of the Electroweak Symmetry Breaking Scale. New Physics, beyond the Standard Model, might be probed by studying the production of the top quark in proton-proton collisions at high energies in the new hadron collider, the LHC. High mass resonances, extra-dimensions, new flavor dynamics, 4th generation of quarks are some of the...
Mr
Salvatore RAPPOCCIO
(Johns Hopkins University)
16/07/2009, 18:00
Standard Model Electroweak Physics
A new top jet tagging algorithm ({\tt CATopTag}) is presented, that uses the Cambridge-Aachen jet finding algorithm to decompose highly boosted top jets into subjet components and examine kinematics of those subjets. It is found that this algorithm has a rejection rate of approximately 98\% for non-top jets with $p_T = 600$ GeV/$c$, while retaining approximately 46\% of top jets with $p_T >...
