Massimiliano Bellomo
(CERN)
18/07/2013, 09:00
Top and Electroweak Physics
Talk presentation
W and Z boson production have been measured in the electron, muon and tau decay channels.
Total and differential cross sections, defined in terms of the decay lepton kinematics, have been
measured as a function of rapidity and transverse momentum.
Precise measurements of W and Z production, including the polarisations of W bosons and of
tau leptons produced in W decays are presented. They...
Sangeun Lee
(Kyungpook National University (KR))
18/07/2013, 09:20
Top and Electroweak Physics
Talk presentation
We present selected measurements done with W and Z bosons performed with the CMS detector, based on samples of events collected during 2011 and 2012 physics runs. Measurements include W and Z inclusive cross sections, the lepton charge asymmetry in W events, and differential cross sections of Z and Drell-Yan production.
Stefan Soldner-Rembold
(University of Manchester),
Stefan Soldner-Rembold
(University of Manchester (GB))
18/07/2013, 09:40
Top and Electroweak Physics
Talk presentation
We present measurements by the CDF and D0 collaborations of properties of W and Z bosons produced in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV at Fermilab's Tevatron Collider. These measurements provide stringent tests on perturbative QCD calculations and are sensitivive to parton distribution functions.
Tara Shears
(University of Liverpool (GB))
18/07/2013, 10:00
Top and Electroweak Physics
Talk presentation
We report measurements of electroweak boson production in the forward region, using data collected at the LHCb experiment with a centre of mass energy of √s=7 TeV with an integrated luminosity of up to 1.0 fb–1. W and Z bosons are reconstructed in leptonic decay channels, and their cross-sections determined using data-driven techniques. All results are compared to NNLO predictions.
Dr
Junpei Maeda
(Tokyo Metropolitan University)
18/07/2013, 10:15
Top and Electroweak Physics
Talk presentation
A search for events ep-> ep Z0 has been performed in ep collisions
at HERA using the ZEUS detector. The search is based on the entire HERA-I and HERA-II data set, amounting to 0.49 fb-1 of integrated luminosity. The Z0 was searched in the di-jet decay mode with elastic condition defined by etamax < 3, where etamax is defined as the pseudorapidity of the energy deposit in the calorimeter...
Tibor Kurca
(Universite Claude Bernard-Lyon I (FR))
18/07/2013, 11:00
Top and Electroweak Physics
Talk presentation
We present a measurement of the mass of the W boson using the D0 detector and the full Run II dataset. Decays of the W into e \nu are selected and the transverse momentum of the electron, the transverse momentum of the neutrino, the transverse mass of the system, and other new variables are considered in the extraction of the mass.
Alessandro Vicini
(Università degli Studi e INFN Milano (IT))
18/07/2013, 11:20
We will review the present status in MW measurements, discussing the recent progress in the development of the Montecarlo generators used in the extraction of the mass value and commenting the role of the proton PDFs as one important source of systematic uncertainty.
Alain Blondel
(Universite de Geneve (CH))
18/07/2013, 11:35
Top and Electroweak Physics
After the Higgs boson discovery by the LHC experiments at 126 GeV, the Standard Model has no free parameters left and measurements sensitive to Electroweak radiative corrections constitute powerful tests of the existence of weakly interacting New Physics beyond the TeV scale.
TLEP is a high luminosity circular e+e- collider to be fit in a 80-100 km tunnel as precursor and companion of a 100...
Tobias Kasprzik
(KIT, Karlsruhe)
18/07/2013, 11:50
Top and Electroweak Physics
Talk presentation
Vector-boson pair production is of great phenomenological importance at the LHC. These processes not only constitute irreducible backgrounds SM Higgs production and various new physics signatures, they may also allow us to study the non-abelian structure of the SM at highest energies and provide the opportunity to search for anomalous couplings. In this talk we review the status of the...
Ben Cooper
(University of London (GB))
18/07/2013, 12:15
Top and Electroweak Physics
Talk presentation
The production of heavy flavour in association with a W or Z boson represents an important process to study QCD. High precision is achieved in measurements of differential cross sections and comparisons are made to stateoftheart NLO QCD calculations. Measurement of W+c production cross section has a unique sensitivity to the strangequark density, which is poorly known at low x. W+b...
Isabel Ojalvo
(University of Wisconsin (US))
18/07/2013, 12:30
Top and Electroweak Physics
Talk presentation
Production and hadronization of heavy quarks (b and c) in association with the W boson in proton-proton collisions is only partially understood. Experimental measurements are necessary to choose amongst the phenomenological models and parameters. Using the LHC proton-proton collision data collected in 2011 at a centre of mass energy of 7 TeV, we present two studies (1) W+c production, where...
Louis Helary
(Boston University (US))
18/07/2013, 12:45
Top and Electroweak Physics
Talk presentation
The integrated and differential fiducial cross sections for the production of a W or Z boson in
association with a highenergy
photon are measured. Events are selected using leptonic decays
of the W and Z bosons, including the Z->nu nu decay channel. The data are used to test the
electroweak sector of the Standard Model and search for evidence for new phenomena. The
measurements are used...
Chia-Ming Kuo
(National Central University (TW))
18/07/2013, 14:30
Top and Electroweak Physics
Talk presentation
We present studies of diboson production in pp collisions at 7 TeV and 8 TeV center-of-mass energy based on data recorded by the CMS detector at the LHC in 2011 and 2012. These include precise measurements of W and Z production in association with a photon, as well as diphoton production. The results are interpreted in terms of constraints on anomalous triple gauge couplings.
Jianbei Liu
(Univ. of Science & Tech. of China (CN))
18/07/2013, 14:45
Top and Electroweak Physics
Talk presentation
The measurement of the WW diboson production cross section in protonproton
interactions is
reported from the ATLAS experiment. The analysis requires heavy bosons to decay leptonically,
using ee, emu and mumu final states associated with large missing energy. The data are used
to test the electroweak sector of the Standard Model and search for evidence for new phenomena.
The cross section...
Advait Neel Nagarkar
(Ohio State University (US))
18/07/2013, 15:00
Top and Electroweak Physics
Talk presentation
The measurement of the WZ diboson production cross section in 7 and 8 TeV protonproton
interactions is reported from the ATLAS experiment. The measurement is derived from events in
which bosons decay leptonically with electrons, muons, and missing energy in the final state.
The data are used to test the electroweak sector of the Standard Model and search for evidence
for new phenomena. The...
Andrea Bocci
(Duke University (US))
18/07/2013, 15:15
Top and Electroweak Physics
Talk presentation
The measurement of the ZZ diboson production cross section in 7 and 8 TeV protonproton
interactions is reported from the ATLAS experiment. The measurement is derived using purely
leptonically decaying bosons with electrons, muons, and missing energy in the final state. The
data are used to test the electroweak sector of the Standard Model and search for evidence for
new phenomena. The...
Jordi Duarte Campderros
(Universidad de Cantabria (ES))
18/07/2013, 15:30
Top and Electroweak Physics
Talk presentation
We present studies of diboson production in pp collisions at 7 TeV and 8 TeV center-of-mass energy based on data recorded by the CMS detector at the LHC in 2011 and 2012. These include precise measurements of WW, WZ, and ZZ production at the LHC. The results are interpreted in terms of constraints on anomalous triple gauge couplings.
Sudeshna Banerjee
(Tata Inst. of Fundamental Research (IN))
18/07/2013, 15:45
Top and Electroweak Physics
Talk presentation
We present measurements of WW and ZZ production cross sections, and anomalous quartic gauge couplings in p\bar{p} collisions at 1.96 TeV with Run II data from 8.6 fb−1 to 9.9 fb−1 collected by the D0 detector at the Fermilab Tevatron Collider. In the WW cross section measurement, the WW -> ee + MET, WW -> \mu\mu + MET, and WW -> e\mu + MET decay channels are used to measure the total and...
Paul Fiedler
18/07/2013, 16:30
Top and Electroweak Physics
Talk presentation
I give an overview on the current theoretical status of the top quark pair production total cross section focusing on the recently derived NNLO result for the gluon fusion channel, which completes the fixed order NNLO calculations. Using our result to provide the NNLO+NNLL prediction for the total cross section, I discuss its phenomenological impact and compare it with the most precise LHC and...
Anna Henrichs
(Yale University (US))
18/07/2013, 16:50
Top and Electroweak Physics
Talk presentation
Measurements of the top quark production cross sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider are presented. The measurement require no, one or two electrons or muons in the final state (single lepton, dilepton, hadronic channel).
In addition, the decay modes with tau leptons are tested (channels with tau leptons).
Michael Maes
(Vrije Universiteit Brussel (VUB) - Interuniversitary Institute for high energies (IIHE))
18/07/2013, 17:10
Top and Electroweak Physics
Talk presentation
Precision measurements are presented of the top-quark pair inclusive production cross section in proton-proton collisions at the LHC at centre-of-mass energies of 7 !TeV and 8 !TeV. The data are collected with the CMS experiment during the years 2011 and 2012. The analyses include all top quark pair final states with the exception of events with two tau-leptons in the final state.
In most...
Nikolaos Kidonakis
(Kennesaw State University)
19/07/2013, 09:00
Top and Electroweak Physics
Talk presentation
I present higher-order results, based on NNLL resummation, for differential transverse momentum and rapidity distributions in processes involving top quarks. In particular results are presented for top-pair production and for single-top production in all three channels,
Philip Hugh Symonds
(Brunel University (GB))
19/07/2013, 09:15
Top and Electroweak Physics
Talk presentation
Differential top quark pair production cross sections are measured in proton-proton collisions at the LHC at centre-of-mass energies of 7 and 8 !TeV, using data collected by the CMS experiment in the years 2011 and 2012. The differential cross sections are measured as functions of various kinematic observables, including the transverse momentum and rapidity of the (anti)top quark and the...
Ford Garberson
(Yale University (US))
19/07/2013, 09:35
Top and Electroweak Physics
Talk presentation
Measurements of the top quark production cross sections in proton proton
collisions with the
ATLAS detector at the Large Hadron Collider are presented. The measurement require no, one
or two electrons or muons in the final state (single lepton, dilepton, hadronic channel).
In addition, the decay modes with tau leptons are tested (channels with tau leptons). The main
focus are measurements...
Maria Veronica Sorin
(Universitat Autònoma de Barcelona (ES))
19/07/2013, 09:55
Top and Electroweak Physics
Talk presentation
We present the most recent measurements by the CDF and D0 Collaborations of inclusive and differential top quark pair cross sections in proton-antiproton collisions at sqrt(s)=1.96 TeV at Fermilab's Tevatron Collider . The measured spectra, binned in several observables, are compared to those obtained from the Monte Carlo simulation and QCD at approximate NNLO.
Zoltan Laszlo Trocsanyi
(University of Debrecen (HU))
19/07/2013, 10:15
Top and Electroweak Physics
Talk presentation
We simulate the hadroproduction of a t tbar pair in association with a
b bbar pair at the LHC using the PowHel program. The generated events
are stored according to the Les-Houches event format. We interface
those events to the PYTHIA shower Monte Carlo program, allowing for
decays of massive particles, showering and hadronization, thus leading
to predictions for differential...
Matthew Dowling
(DESY)
19/07/2013, 11:00
Top and Electroweak Physics
Talk presentation
Between the Tevatron and LHC, top-quark physics is now becoming an area for precision physics. This has lead to an increase in theoretical activity to match the experimental accuracy of top anti-top production. In this talk I discuss the difficulty in properly defining the top-quark mass as measured by experiments and present results for differential distributions of top-quark pair production...
Gabriele Compostella
(Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)
19/07/2013, 11:20
Top and Electroweak Physics
Talk presentation
Measurements of the top quark mass in proton-proton collisions with the ATLAS detector at the Large Hadron Collider are presented. They are performed in various channels: single lepton, dilepton and all-hadronic final states. The most precise measurement is obtained in the single lepton channel using a 3-dimensional template technique which determines the top quark mass together with a global...
Dr
Hartmut Stadie
(Hamburg University (DE))
19/07/2013, 11:40
Top and Electroweak Physics
Talk presentation
Measurements of the top quark mass are presented using data collected by the CMS experiment in proton-proton collisions at the LHC at centre-of-mass energies of 7 and 8 TeV. Analyses in several decay channels of top quark pair events are employed to determine the top quark mass. The results are combined and compared to the world average.
Reinhild Peters
(Georg-August-Universitaet Goettingen (DE))
19/07/2013, 12:00
Top and Electroweak Physics
Talk presentation
The top quark is the heaviest known elementary particle and its mass is a free parameter of the Standard Model. We present the most recent measurement of the top quark mass by the D0 collaboration at the Tevatron proton-antiproton collider in lepton-plus-jet and dilepton channels.
Stijn Blyweert
(Vrije Universiteit Brussel (BE))
19/07/2013, 12:20
Top and Electroweak Physics
Talk presentation
Measurements of the top quark mass employing alternative methods are presented using data collected by the CMS experiment in proton-proton collisions at the LHC in the years 2011 and 2012 at centre-of-mass energies of 7 and 8 !TeV.
The alternative methods include the use of endpoint distributions as well as the study of possible model dependencies of the top mass measurement on the event...
Dr
Philipp Roloff
(CERN)
19/07/2013, 12:40
Top and Electroweak Physics
Talk presentation
Linear electron-positron colliders provide possibilities for top quark mass measurements with unprecedented precision, which are of high relevance to explore the stability of the Standard Model. Two complementary techniques for the measurement of the top mass in
e+e- annihilation exist: The direct reconstruction of the invariant mass of the top quark decay products at energies above the top...
Attila Krasznahorkay
(New York University (US))
19/07/2013, 14:30
Top and Electroweak Physics
Talk presentation
Measurements of the single top quark production cross sections in proton proton
collisions with the ATLAS detector at the Large Hadron Collider are presented.
Measurements of single topquark
production in the tand
Wtchannels
are shown and
determination of the CKM matrix element |Vtb| is discussed. We also discuss the separate
measurement of the top and antitop
quark cross section and...
Alberto Orso Maria Iorio
(Universita e INFN (IT))
19/07/2013, 14:50
Top and Electroweak Physics
Talk presentation
Measurements are presented of t-channel single top quark production in proton-proton collisions at the LHC at centre-of-mass energies of 7 and 8 TeV, using data collected with the CMS experiment during the years 2011 and 2012. The analyses consider decay channels where the W from the top decays into electron-neutrino or muon-neutrino, and makes use of kinematic characteristics of electroweak...
Dr
Gabriele Benelli
(University of Kansas (US))
19/07/2013, 15:05
Top and Electroweak Physics
Talk presentation
Measurements of single top quark production in the tW-channel in pp collisions are presented. In the tW-channel a top quark is produced in association with a W boson. The data were collected in the years 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The experimental signature is similar to top pair production, and there is interference at higher orders between the two processes. The...
Aran Garcia-Bellido Alvarez De Miranda
(University of Rochester (US))
19/07/2013, 15:20
Top and Electroweak Physics
Talk presentation
We present the most recent results from the CDF and D0 Collaborations on searches for electroweak top quark production in proton-antiproton collisions at sqrt(s)=1.96 TeV at Fermilab's Tevatron Collider. Single top signal is separated from background processes using multivariate analysis methods. The final result is compared to state-of-art theory predictions.
Stefano Antonelli
(Universita e INFN (IT))
19/07/2013, 15:40
Top and Electroweak Physics
Talk presentation
A search for single-top production, ep -> etX, has been performed with the
ZEUS detector at HERA using data corresponding to an integrated luminosity of 0.37 fb-1.
No evidence for top production was found, consistent with the
expectation from the Standard Model.
Limits were computed for single-top production via flavour changing neutral current transitions.
The result was combined with a...
Chung Kao
19/07/2013, 16:00
Top and Electroweak Physics
Talk presentation
We investigate the prospects for discovering a top quark decaying into
one light Higgs boson along with a charm quark in top quark pair production at the CERN Large Hadron Collider (LHC).
A general two Higgs doublet model is adopted to study the signature of flavor changing neutral Higgs decay $t \to c\phi^0$, or
$\bar{t} \to \bar{\phi^0$ where $\phi^0$ could be CP-even ($H^0$)
or CP-odd...
George Wei-Shu HOU
19/07/2013, 16:15
Top and Electroweak Physics
Talk presentation
The Higgs boson $h$ and the top quark $t$ are the two most massive and newest particles ever discovered. If $t\to ch$ occurs at a couple of percent level, the observed $ZZ^*$ and $\gamma\gamma$ signal events for the Higgs boson may have accompanying $cbW$ activity coming from $t\bar t$ feeddown. A general two Higgs doublet model brings in new $ct$, $cc$ and $tt$ couplings that modify...
Sandra Leone
(Sezione di Pisa (IT))
19/07/2013, 17:00
Top and Electroweak Physics
Talk presentation
We present the most recent results from the CDF and D0 Collaborations on top quark properties at Fermilab's Tevatron Collider. In particular we discuss the spin correlation measurements, top width measurement, V_tb measurements, searches for anomalous top quark couplings, and searches for Lorentz invariance violation.
Lucia Masetti
(Johannes-Gutenberg-Universitaet Mainz (DE))
19/07/2013, 17:20
Top and Electroweak Physics
Talk presentation
Properties of the top quark are measured with the ATLAS detector using the Large Hadron
Collider protonproton
collisions data. Measurements of the topquark
mass, charge and
polarisation, as well as of the polarization of W bosons in top quark decays to probe the
Wtbvertex
are presented. The search for flavour changing neutral current processes in top
quark decays is reviewed.
Dr
Mara Senghi Soares
(Centro de Investigaciones Energ. Medioambientales y Tecn. - (ES)
19/07/2013, 17:40
Top and Electroweak Physics
Talk presentation
Several measurements of top quark properties are presented using data collected by the CMS experiment during the years 2011 and 2012. The top quark polarization as well as the polarization of W bosons in top quark decays are measured.
The W-boson helicity fractions and angular asymmetries are extracted and limits on anomalous contributions to the Wtb vertex are determined. Furthermore, a...
Liza Mijovic
(CEA-Saclay)
19/07/2013, 18:00
Top and Electroweak Physics
Talk presentation
In protonproton
collisions at the Large Hadron Collider, pairs of top and antitop
quarks are
expected to be mostly produced through gluon fusion, in contrast to production at the Tevatron,
where quark annihilation dominates. Making use of the large number of top quark pairs, we
present measurements of the spin correlation between top and antitop
quarks as well as of the
topquark
charge...
Tyler Mc Millan Dorland
(Deutsches Elektronen-Synchrotron (DE))
19/07/2013, 18:20
Top and Electroweak Physics
Talk presentation
Measurements are presented of the properties of top quark pairs in production from proton-proton collisions at the LHC. The data were collected at pp centre-of-mass energies of 7 and 8 !TeV by the CMS experiment during the years 2011 and 2012. The charge asymmetry is measured both inclusively and differentially as function of the invariant mass, the rapidity and the transverse momentum of the...
r Demina
(University of Rochester (US)), Dr
regina demina
(university of rochester)
19/07/2013, 18:40
Top and Electroweak Physics
Talk presentation
We present the most recent measurements by the CDF and D0 Collaborations of forward-backward asymmetries in top-antitop quark pair production in proton-antiproton collisions. Measurements are corrected for acceptance and resolution effects and compared to theory predictions.
Stanislav Dubnicka
(Institute of Physics)
20/07/2013, 09:00
Top and Electroweak Physics
Talk presentation
Description of the nucleon electromagnetic structure by advanced Unitary and Analytic approach, respecting SU(3) symmetry and analyzing also the recent Mainz MAMI data with impact on the proton charge radius to be compared with the results from the muon hydrogen atom spectroscopy.
589.
The QWeak Experiment: A measurement of the proton weak charge and up-down quark weak couplings.
Michael Gericke
(University of Manitoba)
20/07/2013, 09:20
Top and Electroweak Physics
Talk presentation
The Qweak collaboration recently completed a two year long program of measurements, with the aim of making a precision measurement of the parity violating analyzing power from elastic scattering of 1.16 GeV, longitudinally polarized, electrons on protons at low momentum transfer $Q^2 = 0.025~\rm{GeV/c^2}$. At low momentum transfer, the measured asymmetry is directly related to the weak charge...
Markus Cristinziani
(Universitaet Bonn (DE))
20/07/2013, 09:40
Top and Electroweak Physics
Talk presentation
Started at the end of 2011 the TOPLHCWG is in charge to prepare and
perform combinations of top related measurements from the LHC
experiments. So far a first top quark mass combination was released
along with combinations of the top quark pair production cross-section
and the W helicity in top quark decays. In this talk the challenges and the
progress in such combinations are presented...
Max Baak
(CERN)
20/07/2013, 10:00
Top and Electroweak Physics
Talk presentation
In light of the discovery of the Higgs-like boson by the ATLAS and CMS Collaborations
at the LHC, we -- the Gfitter group -- present an update of the global Standard Model (SM) fit to electroweak precision data. Assuming the new particle to be the SM Higgs boson, all fundamental parameters of the SM are known, allowing for the first time to
overconstrain the SM at the electroweak scale and...
Jenny List
(Deutsches Elektronen-Synchrotron (DE))
20/07/2013, 11:00
Top and Electroweak Physics
Talk presentation
A unique feature of the future e+e- linear collider is the ability to provide
longitudinal polarised beams. In order to fully exploit the benefits of the
polarised beams, the luminosity weighted average polarisation needs to be known
with a permille-level precision. A method for measuring the beam polarisation
from the collision data is presented. It is based on a realistic...
Roman Poeschl
(Universite de Paris-Sud 11 (FR))
20/07/2013, 11:20
Top and Electroweak Physics
Talk presentation
Top quark production in the process e+e- -> ttbar at a future linear electron
positron collider with polarised beams is a powerful tool to determine the
scale of new physics. The presented study assumes a centre-of-mass energy of
500 GeV and an integrated luminosity of 500 fb-1 equally shared between the
incoming beam polarisations of (Pe+, Pe-) = (+/-0.8,-/+0.3). Events are
selected in...
Gudrid Moortgat-Pick
(Hamburg University (DE))
20/07/2013, 11:40
Top and Electroweak Physics
Talk presentation
The impact of beam polarization (e- and e+) for the physics potential
of a LC will be discussed and weighted with regard to the expected LHC
prospects. In particular new examples in the different physics areas as in top physics as well as in electroweak physics (Z', heavy leptons, alternatives) will shortly be
discussed. In particular the new aspect of outlining the physics
potential...
Graziano Venanzoni
(Istituto Nazionale Fisica Nucleare (IT))
20/07/2013, 12:00
Top and Electroweak Physics
Talk presentation
We have recently completed and published
the third independent measurement of the e+e- --> pi+pi-(gamma)
cross section below 1 GeV, which is particularly important to
test the Standard Model calculation for the (g-2) of the muon,
where a long standing 3 sigma discrepancy is observed. The previous
measurements, with the photon emitted at small and large angle,
respectively, were...
Peter Marquard
(KIT)
20/07/2013, 12:20
Top and Electroweak Physics
Talk presentation
The anomalous magnetic moment of both electron and muon are one of the theoretically best predicted quantities. The
MSbar-onshell is a fundamental relation of QCD and an important building block for the measurement
of the top-quark mass at a future linear collider.
Both quantities lead to the same class of diagrams and can be considered together. We present first steps of the...
Marek Schoenherr
(University of Durham (GB))
20/07/2013, 12:40
Top and Electroweak Physics
Talk presentation
In this talk the application of the recently introduced methods to merge NLO calculations of successive jet multiplicities to the production of top pairs in association with jets will be discussed. Emphasis will be put on the achieved theoretical accuracy and the associated perturbative and non-perturbative error estimates. The production of a vector boson in association, constituting a main...
