Conveners
Top and Electroweak Physics
- Maria Jose Costa (IFIC Valencia (ES))
- Pedro Vieira De Castro Ferreira Da Silva (CERN)
- Cen Zhang (Institute of High Energy Physics, Chinese Academy Sciences)
Top and Electroweak Physics
- Pedro Vieira De Castro Ferreira Da Silva (CERN)
- Cen Zhang (Institute of High Energy Physics, Chinese Academy Sciences)
- Maria Jose Costa (IFIC Valencia (ES))
Top and Electroweak Physics
- Pedro Vieira De Castro Ferreira Da Silva (CERN)
- Maria Jose Costa (IFIC Valencia (ES))
- Cen Zhang (Institute of High Energy Physics, Chinese Academy Sciences)
Top and Electroweak Physics
- Pedro Vieira De Castro Ferreira Da Silva (CERN)
- Cen Zhang (Institute of High Energy Physics, Chinese Academy Sciences)
- Maria Jose Costa (IFIC Valencia (ES))
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Mr Luca Mantani (UCLouvain)11/07/2019, 09:00Top and Electroweak PhysicsParallel talk
Modified interactions in the electroweak sector may lead to scattering amplitudes that grow with energy compared to their Standard Model (SM) counterparts. We present a detailed study of all 2โ2 scattering amplitudes involving at least one top quark and a pair of EW bosons. We analyse the high energy behaviour of the amplitudes using the Standard Model Effective Field Theory (SMEFT) to...
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Anastasiia Kozachuk (Lomonosov Moscow State University)11/07/2019, 09:15Top and Electroweak PhysicsParallel talk
We analyze constraints on anomalous tWb couplings that parameterize the possible contribution of New Physics to the weak tWb vertex. We take into account indirect constraints obtained from B-physics ($B\to X_s \gamma$, $B\to X_s l^+l^-$, $B$-$\bar B$ oscillations) and direct constraints from the t-channel single top quark production. In two-dimensional scenarios when different pairs of the...
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Till Martini (HU Berlin)11/07/2019, 09:30Top and Electroweak PhysicsParallel talk
The Matrix Element Method is a promising multi-variate analysis method which offers an optimal approach to compare theory and experiment. However, until recently its usage has been limited by the fact that only leading-order predictions could be employed. This rather crude approximation of the underlying probability distribution can introduce a significant bias into the analysis which requires...
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Marta Luszczak (University of Rzeszow), Antoni Szczurek (Institute of Nuclear Physics)11/07/2019, 09:45Top and Electroweak PhysicsParallel talk
Photon-induced processes in proton-proton interactions have become recently very topical. The large energy at the LHC, when combined with relatively large luminosity at run II, allows starting the exploration of such processes.
We discuss the production of $W^+ W^-$ pairs and $t \bar t$ quark-antiquark pairs in proton-proton collisions induced by two-photon fusion including, for a first time,...
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Agostino De Iorio (Universita e sezione INFN di Napoli (IT))11/07/2019, 10:00Top and Electroweak PhysicsParallel talk
(Includes single top) Measurements of top quark properties using data collected by the CMS experiment are presented. Among them, latest results on top mass, ttbar spin correlations, Yukawa coupling, charge asymmetries, and others will be discussed.
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Kirill Skovpen (Vrije Universiteit Brussel (BE))11/07/2019, 10:15Top and Electroweak PhysicsParallel talk
Top quark production can probe physics beyond the SM in different ways. This talks reviews the current limits on FCNC searches in the top sector, and EFT interpretations in many top quark production modes.
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James William Howarth (University of Manchester (GB))11/07/2019, 10:30Top and Electroweak PhysicsParallel talk
Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. The top-quark is predicted in the SM to decayalmost exclusively into a W boson and a b-quark. We present a wide range of searches for non-SM top quark decays using the 13 TeV ATLAS datasets, including t->q H and t->q Z. In addition, measurements of the spin...
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Andrea Helen Knue (Albert-Ludwigs-Universitaet Freiburg (DE))11/07/2019, 10:45Top and Electroweak PhysicsParallel talk
The latest measurements of the top quark mass using the ATLAS experiment are presented. A measurement based on a multi-dimensional template fit that can constrain the uncertainties on the energy measurements of jets is presented and combined with measurements using dilepton and all-hadronic events. In addition, an analysis of the top quark mass using leptonic kinematic variables is discussed....
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Nikolaos Kidonakis (Kennesaw State University)11/07/2019, 11:30Top and Electroweak PhysicsParallel talk
I present results through three loops for soft anomalous dimensions that control soft-gluon emission in processes involving the top quark. In particular I present results for channels in single-top production and top-pair production as well as for processes with new physics, including tZ, tZ', t gamma, and tH- production. These calculations are ingredients to resummations at N3LL accuracy and...
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Javier Mazzitelli11/07/2019, 11:45Top and Electroweak PhysicsParallel talk
The study of top-quark production and decay is central in the LHC physics programme, allowing to test the Standard Model and offering a window on possible new physics. Precise theoretical predictions are crucial for these analysis.
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In this talk, we report on a new calculation of the next-to-next-to-leading order QCD radiative corrections to the inclusive production of top-quark pairs at hadron... -
Juan Gonzalez (Universidad de Oviedo (ES))11/07/2019, 12:00Top and Electroweak PhysicsParallel talk
Latest results on inclusive top quark pair and single top quark production cross sections are presented using proton-proton collision data collected by CMS. The single top quark analyses investigate separately the production of top quarks via t-channel exchange, via associated production with a W boson (tW), and via the s-channel.
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Otto Heinz Hindrichs (University of Rochester (US))11/07/2019, 12:15Top and Electroweak PhysicsParallel talk
Differential measurements of top quark pair and single top quark production cross sections are presented using data collected by CMS. The cross sections are measured as a function of various kinematic observables of the top quarks and the jets and leptons of the event final state. The results are confronted with precise theory calculations. Multidifferential tt cross sections are presented and...
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Michele Faucci Giannelli (University of Edinburgh)11/07/2019, 12:30Top and Electroweak PhysicsParallel talk
Measurements of the inclusive and differential top-quark pair production cross sections in proton-proton collisions at 13 TeV with the ATLAS detector at the Large Hadron Collider are presented. The inclusive measurements reach high precision and are compared to the best available theoretical calculations. Differential measurements of the kinematic properties of the top quark production are...
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Muhammad Alhroob (University of Oklahoma (US))11/07/2019, 12:45Top and Electroweak PhysicsParallel talk
Measurements of single-top-quark production in proton-proton collisions are presented based on the 8 TeV and 13 TeV ATLAS datasets. The recent combination of the ATLAS and CMS Run 1 single-top-quark measurements is discussed. This combination leads to the most precise direct measurement of the CKM-matrix element Vtb. An interesting quantum effect is the interference of tW and top-quark-pair...
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Seth Moortgat (Vrije Universiteit Brussel (BE))12/07/2019, 09:00Top and Electroweak PhysicsParallel talk
In the context of the Standard Model effective field theory (SMEFT), we study the LHC sensitivity to four fermion operators involving heavy quarks by employing cross section measurements in the $\text{t}\overline{\text{t}}\text{b}\overline{\text{b}}$ final state. Starting from the measurement of total rates, we progressively exploit kinematical information and machine learning techniques to...
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Axel Torsten Maas (University of Graz)12/07/2019, 09:15Top and Electroweak PhysicsParallel talk
Manifest gauge-invariance requires that observable states in the standard-model are described by composite operators, which involve additional Higgs contributions beyond perturbation theory. This field-theoretical effects has been confirmed in lattice simulations. It has experimentally accessible consequences, of which two will be explored.
One is a non-trivial modification of the off-shell...
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Alvaro Lopez Solis (University of Sheffield (GB))12/07/2019, 09:30Top and Electroweak PhysicsParallel talk
The large centre-of-mass energy available at the proton-proton collider LHC allows for the copious production of top-quark-antiquark pairs in association with electroweak gauge bosons (W / Z / gamma) at high transverse momenta. The tt ฬZ and tt ฬW production cross sections are simultaneously measured using a combined fit in several analysis regions. The measurement of the tt ฬZ cross section...
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Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES))12/07/2019, 09:45Top and Electroweak PhysicsParallel talk
(Does not include EFT interpretation of ttV and any FCNC) A comprehensive set of measurements of top quark pair production in association with EWK bosons (W, Z or ษฃ) is presented.
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Timothee Theveneaux-Pelzer (Deutsches Elektronen-Synchrotron (DE))12/07/2019, 10:00Top and Electroweak PhysicsParallel talk
Measurements of the production cross-section of top-quark-antiquark pairs with additional jets provide important tests of quantum chromodynamics (QCD). The ATLAS experiment has measured several final state observables that are sensitive to additional radiation in top-quark-antiquark final states at 13 TeV. These measurements are compared to predictions of modern Monte Carlo generators based on...
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Prof. Chung Kao (University of Oklahoma)12/07/2019, 10:15Top and Electroweak PhysicsParallel talk
We investigate the prospects for discovering a top quark decaying into
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one light Higgs boson ($h^0$) along with a charm quark
in top quark pair production
at the CERN Large Hadron Collider (LHC) and future hadron colliers.
A general two Higgs doublet model is adopted to study the signature
of flavor changing neutral Higgs (FCNH) interactions with $t \to c h^0$,
followed by $h^0 \to WW^*$... -
Dr Sebastien Wertz (Universitaet Zuerich (CH))12/07/2019, 10:30Top and Electroweak PhysicsParallel talk
(Does not include EFT interpretation and any FCNC) A comprehensive set of measurements of top quark pair and single top quark production in association with light and b-jets is presented. The status of the search for four top quark production, to which the LHC experiments are starting to be sensitive, and that has important BSM re-interpretations, is also reported.
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Stephen Farry (University of Liverpool (GB))12/07/2019, 10:45Top and Electroweak PhysicsParallel talk
Results from LHCb on top production in the forward region are presented. LHCb provides unique coverage at forward rapidities at the LHC, and measurements at LHCb probe a unique kinematic range, providing novel constraints on parton distribution functions. The potential for future measurements at LHCb, following major upgrades that will enable the collection of integrated luminosities of at...
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Aravind Holur Vijay12/07/2019, 11:30Top and Electroweak PhysicsParallel talk
In top quark production, the polarization of top quarks, decided by the chiral structure of couplings, is likely to be modified in the presence of any new physics contribution to the production. Hence the same is a good discriminator for those new physics models wherein the couplings have a chiral structure different than that in the Standard Model (SM). In this note we construct probes of the...
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Mr Suman Chatterjee (Tata Inst. of Fundamental Research (IN))12/07/2019, 11:45Top and Electroweak PhysicsParallel talk
We have performed an object tagging approach to identify boosted top quark decaying to electron or muon final state without an explicit use of the lepton. When top quark is produced with large transverse momentum, its daughter lepton has a hadronic activity in it's neighborhood, and hence standard lepton identification and isolation criteria are affected. We have come up with novel observables...
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Richard Ruiz (Universite Catholique de Louvain)12/07/2019, 12:00Top and Electroweak PhysicsParallel talk
At TeV-scale hadron colliders, such at the CERN LHC and proposed future facilities at $\sqrt{s}=28-100$ TeV, single and pair production of top quarks invariably constitute a major background in multi-lepton searches for new, TeV-scale particles, such as $W'$ gauge bosons, smuons $(\tilde{\mu})$, and heavy neutrinos $(N)$. Due to imperfect tagging efficiencies, however, vetoing events according...
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Martijn Mulders (CERN), Reinhard Schwienhorst (Michigan State University (US)), Michelangelo Mangano (CERN)12/07/2019, 12:15Top and Electroweak PhysicsParallel talk
The LHC Top Working Group was established to perform combinations of
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top-quark related measurements from the LHC experiments, and provides a
forum to discuss interpretation of LHC measurements in the light of
the most recent theory developments. In this talk the challenges and
the progress in such combinations are presented together with the
latest results, including the recently published... -
Freya Blekman (IIHE, Vrije Universiteit Brussel (BE))12/07/2019, 12:30Top and Electroweak PhysicsParallel talk
The future circular collider (FCC) study released a conceptual design report (CDR) in January 2019. FCC-ee can provide $e^+e^โ$ collisions with center-of-mass energies of up to 365 GeV and luminosities at the highest energy of 1.4 $10^{34}$ cm$^{-2}$s$^{-1}$ in up to four IPs. Threshold scans enable precision measurements of the top mass and width constraining $\alpha_s$ and $Y_T$, while a run...
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Aleksander Filip Zarnecki (University of Warsaw)12/07/2019, 12:45Top and Electroweak PhysicsParallel talk
The Compact Linear Collider (CLIC) is a mature option for a future electron-positron collider operating at centre-of-mass energies of up to 3 TeV. CLIC will be built and operated in a staged approach with three centre-of-mass energy stages currently assumed to be 380 GeV, 1.5 TeV, and 3 TeV. This contribution discusses the prospects for precision measurements of top-quark production and...
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German Sborlini (Universitร di Milano, INFN Milano and IFIC-Valencia)12/07/2019, 14:30Top and Electroweak PhysicsParallel talk
In this talk, we briefly describe the recent progress on the inclusion of mixed QCD-QED corrections for collider observables. In particular, we developed a formalism to extend qt-resummation to deal with simultaneous emission of gluons and photons. We applied it to Z-production at colliders, and discuss extensions to more complicated final states.
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Siqi Yang (University of Iowa (US))12/07/2019, 14:45Top and Electroweak PhysicsParallel talk
Precision measurements of the production cross sections of W and Z bosons in proton-proton collisions provide stringent tests of perturbative QCD and yield important information about the parton distribution functions (PDFs) for quarks within the proton. We report measurements of fiducial integrated and differential cross sections for inclusive W+, Wโ and Z boson production, analysed in the...
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Josu Cantero (Oklahoma State University (US))12/07/2019, 15:00Top and Electroweak PhysicsParallel talk
The production of prompt isolated photons at hadron colliders provides stringent tests of perturbative QCD and can be used to evaluate probability density functions of partons in the proton. In this talk, we present the measurements of the isolated-photon plus two jets and the inclusive isolated-photons cross sections, both measured using proton-proton collision data collected by the ATLAS...
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Chen Wang (University of Science and Technology of China (CN))12/07/2019, 15:15Top and Electroweak PhysicsParallel talk
We present a measurement of the shape of the Z boson rapidity for $Z/\gamma^{*} \to\mu^+\mu^- $ produced in $ p\bar p$ collision at $\sqrt s=$1.96 TeV. We use 8.6 fb$^{-1}$ of $ p\bar p$ data collected by the D0 detector at the Tevatron collider. The results are compared to NNLO QCD predictions using different sets of Parton Density Functions. We also present a measurement of the shape of...
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Stephane Brunet Cooperstein (Univ. of California San Diego (US))12/07/2019, 15:30Top and Electroweak PhysicsParallel talk
The study of the associated production of vector bosons and jets constitutes an excellent testbench to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets have been studied in pp collisions at 7, 8 and 13 TeV center-of-mass energies. Differential distributions as function of a broad range of kinematical observables are...
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Evelin Meoni (Universita della Calabria e INFN (IT))12/07/2019, 15:45Top and Electroweak PhysicsParallel talk
Measurements of weak boson production in association with jets are presented. First, differential cross sections for Z-boson and W-boson production in association with jets are presented, with the measurements performed using proton-proton collisions at โs = 8 TeV. The data are compared to next-to-leading order QCD calculations and predictions from a variety of different parton distribution...
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Guillaume Taillepied (Universitรฉ Clermont Auvergne (FR))12/07/2019, 16:30Top and Electroweak PhysicsParallel talk
Electroweak bosons are created in the hard scattering processes at the initial stage of heavy-ion collisions and they are insensitive to the presence of the strongly-interacting medium. This makes them clean probes of the initial-state effects in heavy-ion collisions, such as the nuclear modification of the Parton Distribution Functions (nPDFs). Furthermore, their measurement in heavy-ion...
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William Javier Torres Bobadilla (IFIC CSIC-UV)12/07/2019, 16:45Top and Electroweak PhysicsParallel talk
In this talk we review the recent developments of the evaluation of the two-loop virtual correction to the electron-muon scattering, $\mu e \to\mu e$, at Next-to-Next-to-Leading order in QED. These radiative corrections are relevant for the analysis of the MUonE experiment, recently proposed at CERN. MUonE aims at the high precision determination of the QED running coupling constant in the...
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Nansi Andari (Universitรฉ Paris-Saclay (FR))12/07/2019, 17:00Top and Electroweak PhysicsParallel talk
The electroweak sector of the Standard Model can be tested via precision measurements of fundamental observables. Measurements of the Drell-Yan production of Z bosons at the LHC provide a benchmark of our understanding of perturbative QCD and electroweak processes. The ATLAS collaboration has recently used such measurements to evaluate the effective leptonic weak mixing angle using data...
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Markus Seidel (University of Maryland (US))12/07/2019, 17:15Top and Electroweak PhysicsParallel talk
This talk reviews precision EW measurements at CMS.
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William Barter (Imperial College (GB))12/07/2019, 17:30Top and Electroweak PhysicsParallel talk
he LHCb detector at the LHC offers unique coverage of forward rapidities, allowing the experiment to play an important role in precision measurements of electroweak physics at the LHC. Precision cross-section measurements (from LHC Runs 1 and 2) will be presented. Prospective studies will also be presented, including the potential of a measurement of the W boson mass using the LHCb Run 2 data,...
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Daniel Britzger (Deutsches Elektronen-Synchrotron (DE)), Daniel Britzger (Max-Planck-Institut fรผr Physik Mรผnchen)12/07/2019, 17:45Top and Electroweak PhysicsParallel talk
The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic e + p and e โ p neutral current and charged current scattering cross sections published by the H1 Collaboration, including data with longitudinally polarised lepton beams. The mass of the W boson in the on-shell scheme is determined as $m_W = 80.520\pm 0.115$ GeV. The...
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Juan Pablo Fernandez Ramos (Centro de Investigaciones Energรฉti cas Medioambientales y Tecno)12/07/2019, 18:00Top and Electroweak PhysicsParallel talk
The associated production of vector bosons V (W, Z or gamma) and jets originating from heavy-flavour (c or b) quarks is a large background source in measurements of other standard model processes, Higgs boson studies, and many searches for physics beyond the SM. The study of events with a vector boson accompanied by heavy-flavour jets is crucial to refine the theoretical calculations in...
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Prof. Shuang-Yong Zhou (University of Science and Technology of China)13/07/2019, 09:00Top and Electroweak PhysicsParallel talk
Weak vector boson scattering (VBS) is a sensitive probe of new physics effects in the electroweak symmetry breaking. Currently, experimental results at the LHC are interpreted in the effective field theory approach, where possible deviations from the Standard Model in the quartic-gauge-boson couplings are often described by 18 dimension-8 operators. By assuming that a UV completion exists, we...
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Ignasi Rosell (Universidad CEU Cardenal Herrera, Valencia)13/07/2019, 09:15Top and Electroweak PhysicsParallel talk
Due to the current gap between the electroweak scale and the scale of New Physics, the use of electroweak effective approaches is justified. A linear realization of the electroweak symmetry breaking with the Higgs forming a doublet is a first possibility (SMEFT), but we prefer to use the more general non-linear realization, being the Higgs a scalar singlet with independent couplings (EWET or...
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Philippe Calfayan (Indiana University)13/07/2019, 09:30Top and Electroweak PhysicsParallel talk
Measurements of electroweak boson pair production at the LHC constitute a stringent test of the electroweak sector and provide a model-independent means to search for new physics at the TeV scale. In this talk, we present recent results for inclusive WW and WZ production in proton-proton collisions at โs=13 TeV, including polarisation studies in the WZ final state. The precision measurements...
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Stefan Richter (DESY)13/07/2019, 09:45Top and Electroweak PhysicsParallel talk
In this talk, we present a number of recent measurements of inclusive ZZ and Z๐พ production in proton-proton collisions at โs=13 TeV at ATLAS. The unfolded differential cross section for ZZ->4l as a function of the four-lepton invariant mass is presented and compared to state-of-the-art Standard Model calculations. If available, an additional measurement of ZZ production will be presented for...
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Philip Sommer (University of Sheffield (GB))13/07/2019, 10:00Top and Electroweak PhysicsParallel talk
The scattering of electroweak bosons tests the gauge structure of the Standard Model and is sensitive to anomalous quartic gauge couplings. In this talk, we present recent results on vector-boson scattering from the ATLAS experiment using proton-proton collisions at โs=13 TeV. This includes the observation of WZ and same-sign-WW production via vector-boson scattering along with a measurement...
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Alexander Naip Tuna (Harvard University (US))13/07/2019, 10:15Top and Electroweak PhysicsParallel talk
A search for the production of three massive vector bosons in WWW, WWZ and WZZ final states is presented, using proton-proton collision data collected by the ATLAS experiment at โs=13 TeV. The analysis utilises multiple search channels. WWW production is probed using a fully-leptonic decay channel, with three-charged leptons and missing transverse momentum, and a semi-leptonic decay channel...
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Chia-Ming Kuo (National Central University (TW))13/07/2019, 10:30Top and Electroweak PhysicsParallel talk
This talk review recent measurements of multiboson production and constraints on anomalous gauge couplings.
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Jian Wang (University of Florida (US))13/07/2019, 11:30Top and Electroweak PhysicsParallel talk
The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver an integrated luminosity of up to 3000 fb-1. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (โpileupโ) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. Prospects for selected Standard Model (SM)...
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Elizabeth Locci (Universitรฉ Paris-Saclay (FR))13/07/2019, 11:45Top and Electroweak PhysicsParallel talk
The Future Circular Collider with electron-positron beams (FCC-ee) should provide improvements of the electroweak precision measurement concerning Z, W, H and their masses by a large factor over the present status. The unparalleled experimental precision would open, via Electroweak loop corrections, a broad discovery potential for new, at least weakly interacting particles up to high energy...
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Marina Beguin (Universitรฉ Paris-Saclay (FR))13/07/2019, 12:00Top and Electroweak PhysicsParallel talk
In the Standard Model theory, the mass of the W boson is predicted with an uncertainty of 4 MeV whereas the current experimental accuracy is of 12 MeV. Improving the accuracy of the W mass measurement is a crucial test of the overall consistency of the SM and any deviation might reveal the emergence of new physics. With more than 2x10^8 W pairs produced at the W threshold energy and above, the...
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Prof. Zhijun Liang (Chinese Academy of Sciences (CN))13/07/2019, 12:15Top and Electroweak PhysicsParallel talk
The Circular Electron Positron Collider (CEPC) project aims to build a circular electron-positron collider capable of precision physics measurements at center-of-mass energies ranging from 90 GeV to 240GeV. The CEPC has a total circumference of at least one hundred kilometers and at least two interaction points. In its 10 years operation at 240 GeV, it will collect more than one million Higgs...
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Adrian Irles (LAL -CNRS/IN2P3)13/07/2019, 12:30Top and Electroweak PhysicsParallel talk
The 3rd generation quarks are, due to their large mass, highly sensitive probes for new physics connected to the electroweak symmetry breaking. Linear e+e- colliders allow for clean measurements of heavy quark final states between the Z-Pole and the TeV scale with sensitivities to different aspects of the manifestations of new physics in the extracted electroweak couplings. At the same time...
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Christian Schwanenberger (Deutsches Elektronen-Synchrotron (DE))13/07/2019, 12:45Top and Electroweak PhysicsParallel talk
The Large Hadron-electron Collider (LHeC) is a proposed upgrade of the LHC at CERN. It consists of an ERL providing electrons to collide with the HL-LHC, HE-LHC and the FCC-hh proton beams achieving centre-of-mass energies 1.3-3.5 TeV, respectively, and luminosities $\sim 10^{34}$ cm$^{โ2}$ s$^{-1}$. These large luminosities and the corresponding cross sections provide huge possibilities for...
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