Conveners
Top Quark and Electroweak Physics: Session I - Premiere
- Maria Aldaya Martin (DESY)
- Jiri Kvita (Palacky University (CZ))
- Aram Apyan (Fermi National Accelerator Lab. (US))
- Tomas Jezo (University of Zurich)
Top Quark and Electroweak Physics: Session II - Premiere
- Maria Aldaya Martin (DESY)
- Aram Apyan (Fermi National Accelerator Lab. (US))
- Jiri Kvita (Palacky University (CZ))
- Kristin Lohwasser (University of Sheffield (GB))
Top Quark and Electroweak Physics: Session III - Premiere
- Aram Apyan (Fermi National Accelerator Lab. (US))
- Kristin Lohwasser (University of Sheffield (GB))
- Inkyu Park (University of Seoul, Department of Physics (KR))
- Jiri Kvita (Palacky University (CZ))
- Tomas Jezo (University of Zurich)
- Maria Aldaya Martin (DESY)
Top Quark and Electroweak Physics: Session IV - Premiere
- Inkyu Park (University of Seoul, Department of Physics (KR))
- Tomas Jezo (University of Zurich)
- Jiri Kvita (Palacky University (CZ))
Top Quark and Electroweak Physics: Session II - Replay
- There are no conveners in this block
Top Quark and Electroweak Physics: Session IV - Replay
- There are no conveners in this block
Top Quark and Electroweak Physics: Session I - Replay
- There are no conveners in this block
Top Quark and Electroweak Physics: Session III - Replay
- There are no conveners in this block
We present a measurement of the shape of the transverse momentum distribution for W boson in the $W \to e\nu$ decay channel using 4.3 fb$^{-1}$ of $ p\bar p$ data at $\sqrt s=$1.96 TeV. The results are compared to QCD predictions both at reconstructed and particle level. We also present a measurement of the shape of the Z boson rapidity using $Z/\gamma^{*} \to\mu^+\mu^- $ events produced in...
Latest results on W boson measurements are presented using collision data collected by CMS. Multi-differential production cross sections, charge asymmetry, polarization measurements will be discussed, and new other results.
The LHCb detector at the LHC offers unique coverage of forward rapidities, allowing the experiment to play an important role in measurements of Standard Model processes at the LHC. Measurements of W, Z, top and jet production at LHCb will be presented, and future prospects will be discussed.
Latest results on inclusive top quark pair and single top quark production cross sections are presented using 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.
Comprehensive measurements of differential cross-sections of top-quark-antiquark pair-production are presented. The measurements are performed in the electron-muon, the lepton+jets and the all-hadronic channels. The latter two allow for reconstruction of the top-quark and top-quark-pair kinematic distributions. In the electron-muon channel, kinematic properties of the two leptons are measured...
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.
We describe the program KKMC-hh, which calculates Z boson processes in hadronic collisions using coherent exclusive exponentiation (CEEX) with exact second-order photonic corrections at next-to-leading log and first-order weak vertex corrections, including initial and final state photonic radiation and initial-final interference. We describe current applications to precision forward-backward...
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...
We discuss the improvements that the ILC can make in precision electroweak observables based on studies with the ILD detector concept. These include observables from WW production and radiative return to the Z at a centre of mass energy of 250 GeV, and from a dedicated stage of running at the Z pole. These improvements take advantage of the ILC capabilities for polarized electron and positron...
The production of multiple weak vector bosons at the LHC constitutes 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 the latest results from the ATLAS experiment for multi-boson production in proton-proton collisions at √s=13 TeV. The measurements exploit both the leptonic and hadronic decays...
We present the search for heavy triboson production, specifically targeting the production of WWW, WWZ, WZZ and ZZZ processes in multileptonic final states with 137 fb$^{-1}$ of data collected by the CMS detector during Run II of the LHC at $\sqrt{s}$ = 13 TeV. An event selection consisting of identically charged dileptons and trileptons is constructed to primarily study the WWW process, while...
So far light-by-light scattering ($\gamma \gamma \to \gamma \gamma$) was not accessible for experiments because the corresponding cross section is rather low. Measurements of diphotons in ultra-peripheral collisions (UPCs) of lead-lead have been reported recently by the ATLAS and CMS Collaborations. Our theoretical results based on equivalent photon approximation in the impact parameter space...
The remarkably large integrated luminosity collected by the ATLAS detector at the highest proton-proton collision energy provided by LHC allows to probe the presence on new physics that might break well established symmetries or enhance extremely rare processes in the SM. Two such significant examples are lepton universality and Flavour Changing Neutral Currents (FCNC). Recent measurements...
The top-quark mass is an important fundamental parameter of the Standard Model, since higher-order corrections involving top quarks have a large impact due to the high value of the top-quark mass. A new measurement of the top-quark mass is presented. The analysis is based on top-quark-antiquark pair events in which a soft muon is reconstructed which originates in a large fraction of the cases...
Measurements of top quark properties using data collected by the CMS experiment are presented. Among them, the latest results on top mass and its running, top Yukawa coupling, the top sector of the CKM matrix, ttbar forward backward asymmetry, as well as other new results will be discussed.
Due to its high mass top quarks decay before top-flavoured hadrons are formed. This feature leads to interesting phenomenological consequences, among them is the access to spin polarisation effects in top-quark production. While top-quarks are produced unpolarized in top-quark-antiquark pair production, there exists a correlation between the spins of the top-quark and the top-antiquark. In the...
Top quark production can probe physics beyond the SM in different ways. The Effective Field Theory (EFT) framework allows searching for BSM effects in a model independent way. CMS experiment is pioneering EFT measurements that move towards using full potential of the data in the most global way possible. Searches for flavour-changing neutral currents (FCNC) and anomalous top quark interactions...
Over the last years, various efforts were made for interpreting measurements of top-quark observables in the context of the Standard Model Effective Field Theory (SMEFT). In this talk, we point out aspects for enhancing fits constraining Wilson coefficients of dimension-six operators that should be considered when aiming towards a global fit of SMEFT coefficients in the top-quark sector.
On...
The hard scattering process in which two top-quark-antiquark pairs are produced is also called four-top-quarks production and is predicted to have a small cross-section of 12 fb in the standard model. This very rare process has not been observed yet. The background is mainly given by top-quark-antiquark production in association with heavy flavor jets. In this presentation, two analyses are...
(Does not include EFT interpretation and any FCNC) A comprehensive set of measurements of top quark pair production in association with light-flavored 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.
(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 ɣ) is presented. Inclusive and differential measurements are shown using the data collected by CMS.
The unprecedentedly large integrated luminosity accumulated by the ATLAS detector at the highest proton-proton collision energy provided by LHC allows the study of rare SM processes. The associated production of top quarks with neutral bosons is such an example: it directly probes top-quark couplings to photons and Z bosons and tests for deviations from the standard model.
Three...
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 to start the exploration of such processes.
We discuss 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,...
In this talk LUXE (Laser Und XFEL Experiment) is discussed. It is an experiment that aims to use the high-quality and high-energy electron beam of the European XFEL and a powerful laser. The scientific objective of the experiment is to study quantum electrodynamics processes in the regime of strong fields. High-energy electrons, accelerated by the European XFEL linear accelerator, and...
Photon-photon fusion is a rare process at hadron and ion colliders. It is particularly interesting as a remarkably clean interaction with little (if any) remnant activity from the interacting particles. In this talk, we present the status of photon-photon fusion measurements at the ATLAS detector. This includes the production of photon pairs via light-by-light scattering in heavy ion...
Measurements that exploit electroweak boson scattering and electroweak boson fusion (VBF) processes have become increasingly common at the Large Hadron Collider in the last few years. All of these measurements and searches rely on accurate theoretical modelling of the VBF and VBS production mechanisms. The production of single vector-boson production via weak boson fusion provides a standard...
Latest VBS Run-2 results from CMS.
The scattering of electroweak bosons tests the gauge structure of the Standard Model and is sensitive to anomalous quartic weak boson self interactions. In this talk, we present the latest results on weak-boson scattering from the ATLAS experiment using proton-proton collisions at √s=13 TeV. This will include the first observation of ZZ production, evidence for Z$\gamma$ production via...
The chiral nature of the top quark couplings can be modified by new physics. Hence, the polarization of top quarks serves as a promising window for exploring the existence and nature of new physics. Detecting the polarization of boosted top quark jets in colliders is quite challenging, and several studies have already explored different kinematic variables for this purpose. In my talk I will...
For many top quark measurements, it is essential to reconstruct the top quark from its decay products. For example, the top quark pair production process in the all-jets final state has six jets initiated from daughter partons and additional jets from initial/final state radiation. Due to the many possible permutations, it is very hard to assign jets to partons. We use a deep neural network...
The electro-weak couplings of the top and bottom quarks are sensitive probes of new physics. Especially the former were very poorly constrained until recently. We derive limits on the relevant Wilson coefficients of the Standard Model Effective Field Theory using ATLAS and CMS data on associated top quark production, single top-quark production and top decay, and LEP data on the Zbb vertex....
We present updated results for a global fit of dimension six operators in the top quark sector of the Standard Model Effective Field Theory using experimental data from the Tevatron and the LHC at 7, 8 and 13 TeV center-of-mass energy. We include all contributions from dimension six operators up to and including $\Lambda^{-4}$ in the effective field theory expansion and study the effects of...
We extend and improve a previous calculation of electroweak top-pair
production at the LHC via Z' bosons to NLO QCD in POWHEG. In particular,
we add the effects of t-channel W and W' exchange and allow for
flavour--non-diagonal Z' and W' couplings. The calculation is matched to
parton showers in the POWHEG BOX framework. As an application, we
present numerical results for a model...
One of the main goals of the future $e^+e^-$ colliders is to measure the top-quark mass and width in a scan of the pair production threshold. Yet, the shape of the threshold cross section depends also on other model parameters as the top Yukawa coupling and the strong coupling constant. We study the expected precision of the top-quark mass determination from the threshold scan at CLIC, ILC...
The process ee->qq with qq=cc,bb,tt plays a central role in the physics programs of high energy electron-positron colliders. Polarised beams as available at the international collider ILC are an essential input for the complete measurement of the helicity amplitudes that govern the production cross section. Heavy quarks are likely messengers to new physics and at the same time they are ideal...
The LHeC and the FCC-eh offer unique prospects for the measurement of EW parameters and top properties in energy frontier, luminous ep scattering. In this talk we will revisit the determination of $Z$, $W$ and top mass through inclusive measurements, showing the latest results as contained in the 2020 LHeC White Paper. Next, we will show the possibilities for the determination of the vector...
