Conveners
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Rene Poncelet (IFJ PAN Krakow)
- Peter Berta (Charles University, Prague (CZ))
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Maria Moreno Llacer (Univ. of Valencia and CSIC (ES))
- Peter Berta (Charles University, Prague (CZ))
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Maria Moreno Llacer (Univ. of Valencia and CSIC (ES))
- Peter Berta (Charles University, Prague (CZ))
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Maria Moreno Llacer (Univ. of Valencia and CSIC (ES))
- Rene Poncelet (IFJ PAN Krakow)
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Maria Vittoria Garzelli (Hamburg University)
- Rene Poncelet (IFJ PAN Krakow)
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Maria Vittoria Garzelli (Hamburg University)
- Qiang Li (Peking University (CN))
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Qiang Li (Peking University (CN))
- Rene Poncelet (IFJ PAN Krakow)
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Qiang Li (Peking University (CN))
- Maria Vittoria Garzelli (Hamburg University)
Top Quark and Electroweak Physics: Top Quark and Electroweak Physics
- Peter Berta (Charles University, Prague (CZ))
- Qiang Li (Peking University (CN))
The latest measurements on W and Z boson production, decays and properties at CMS obtained with CMS proton collision data at 13 and 13.6 TeV are presented. Some of these measurements lead to constraints to SM parameters and to new physics models.
The study of single W and Z boson production at the LHC provides stringent tests of the electroweak theory and perturbative QCD. The ATLAS experiment has measured the W boson production cross section in the LHC data collected in 2022 at 13.6 TeV. By forming ratios of Z, W, and ttbar production cross sections, this measurement becomes a sensitive probe of the quark and gluon content of the...
The GENEVA method provides a means to combine resummed and fixed order calculations at state-of-the-art accuracy with a parton shower program. GENEVA NNLO+PS generators have now been constructed for a range of colour-singlet production processes and using a range of different resolution variables. I will review the GENEVA framework and then describe several recent advancements, such as the use...
In this talk, we discuss the main features of the combined QCD and QED resummation formalism for weak vector boson production at hadron colliders. Specifically, resummation is realized at NNLL+NNLO in QCD with the inclusion of mixed QCD-QED effects at LL and pure QED ones at NLL matched with fixed-order full-EW NLO contribution (i.e. at one loop). Since the naive Abelianization of the QCD...
The LHCb experiment covers the forward region of proton-proton collisions, and it can improve the current electroweak landscape by studying the production of electroweak bosons in this phase space complementary to ATLAS and CMS. The precision measurements of the properties of single W and Z boson at LHCb could not only provide stringent test of the Standard Model, but also are essential inputs...
At hadron colliders, charged and neutral Drell-Yan processes can be used for a high precision determination of the W-boson mass and the weak mixing angle through template fits. Since these measurements rely on Monte Carlo templates, it is crucial to have both flexible and accurate event generators.
In this contribution, we present the latest updates of the Z_ew-BMNNPV package for the...
ATLAS has used the W and Z boson production processes to perform a range of precision measurements of SM parameters. The production rate of Z+jet events with large missing transverse momentum is used to measure the decay width of the Z boson decaying to neutrinos. Differential measurements of this topology with minimal assumptions on theoretical calculations are discussed and allow comparisons...
High precision measurements of top quark pair production are crucial to advance our understanding of perturbative and soft QCD and provide a deeper understanding of the partons inside the proton. In this talk, recent highlights of top quark cross-section measurements at CMS ranging from 5 TeV up to 13.6 TeV will be presented. Moreover, new results of differential cross-section measurements in...
The LHC produces a vast sample of top quark pairs and single top quarks. Measurements of the inclusive top quark production rates at the LHC have reached a precision of several percent and test advanced Next-to-Next-to-Leading Order predictions in QCD. In this contribution, comprehensive measurements of top-quark-antiquark pair and single-top-quark production are presented that use data...
I present theoretical results for top-pair production as well as for the associated production of top quarks with $W$ bosons. Soft-gluon corrections from resummation are calculated through approximate N$^3$LO and added to fixed-order QCD results, and electroweak corrections are included at NLO. Top-quark transverse-momentum and rapidity distributions are also presented. In all cases the...
We investigate the impact of recent LHC measurements of differential top-quark pair production cross sections on the proton parton distribution functions (PDFs) using the ABMP16 methodology. The theoretical predictions are computed at NNLO QCD using the state-of-the-art MATRIX framework. The top-quark mass and strong coupling constants are free parameters of the fit, and we pay particular...
The high center-of-mass energy of the LHC opens the window to precise measurements of electroweak top quark production as well as vector boson and quark-associated production of top quark pairs and single top quarks. In this talk, recent inclusive and differential measurements of single-top and rare-top quark production will be discussed.
Being the heaviest fermion and having a Yukawa interaction almost equal to one, the top-quark represents one of the most interesting portals to New Physics (NP). If it is light or belongs to a secluded sector, NP can be difficult to detect in colliders with traditional methods. An alternative way, at least for setting bounds, is studying the virtual corrections to SM processes. Kinematical...
Millions of top quarks already produced at LHC TeV are ideal for searching for rare top-quark decays. Besides flavor-changing neutral currents that are highly suppressed in the Standard Model, baryon and lepton number conservation can be probed in top quark events. In this talk, recent searches for rare and beyond the Standard Model top-quark production and decay with significantly increased...
The LHC is a top factory and run 2 has delivered billions of top quarks to the experiments. In this contribution, the results are presented of searches by the ATLAS experiment for Charge Lepton Flavour Violation (cLFV), and lepton flavour universality where the ratio of the branching ratios of the W boson to muons and electrons is measured.
The LHC is a top quark factory and provides a unique opportunity to look for top quark production and decay processes that are highly suppressed or forbidden in the SM. In this contribution results are presented of searches for Flavour Changing Neutral Currents (FCNC) interactions of the top quark. These processes are beyond the experimental sensitivity in the SM, but can receive enhanced...
The top quark loop gives the major quantum correction to the Higgs mass squared, playing the dominant role in the well-known Hierarchy Problem. Traditional models address the issue by introducing TeV-scale top partners. However, the absence of these new particles urges for an alternative solution. In this talk, I will present a new scenario where the top Yukawa coupling is modified to tackle...
Extrapolations of sensitivity to new interactions and standard model parameters inform the particle physics community about the potential of future upgrade programmes and colliders. Statistical considerations based on inclusive quantities and established analysis strategies typically give rise to a sensitivity scaling with the square root of the luminosity, $\sqrt{L}$. This suggests only a...
The electro-weak couplings of the top quark are directly accessible in rare "top+X" production processes at the LHC, where top quark pairs or single top quark are produced in associations with bosons. We present a new analysis of the top sector of the Standard Model EFT. The fit is based on a fully NLO parameterization and includes the most recent (differential) results from ATLAS and CMS. We...
The high center-of-mass energy of proton-proton collisions and the large available datasets at the CERN Large Hadron Collider allow us to study rare processes of the Standard Model (SM) with unprecedented precision. Observation of the four-top-quark process is presented. This final state is combined with the Higgs to gammagamma final state and limites on the Higgs boson width is set.
The high center-of-mass energy of proton-proton collisions and the large available datasets at the CERN Large Hadron Collider allow to study rare processes of the Standard Model with unprecedented precision. Measurements of rare SM processes provide new tests of the SM predictions with the potential to unveil discrepancies with the SM predictions or provide important input for the improvement...
The top-quark pair production in association with heavy-flavour jets (b/c) is a difficult process to calculate and model and is one of the leading sources of background to ttH and 4tops in 1l/2LOS channel. To improve our understanding of this process, a new inclusive and differential measurement of this process was performed. Results from ATLAS using the full run 2 dataset will be presented.
We will present the state-of-the-art full off-shell NLO QCD results for the $pp \to t\bar{t}W^+\, j+X$ process. The multi-lepton top-quark decay channel at the LHC with $\sqrt{s}= 13$ TeV will be analysed. In our calculation off-shell top quarks and gauge bosons are described by Breit-Wigner propagators. Furthermore, double-, single- as well as non-resonant top-quark contributions along with...
We will report on the calculation of the next-to-leading order QCD corrections to the Standard Model process $ppโt\bar{t}t\bar{t}$ in the $4\ell$ top-quark decay channel. Higher-order QCD effects in both the production and decays of the four top quarks are taken into account. The latter effects are treated in the narrow width approximation, which preserves top-quark spin correlations. We will...
The associated top-quark pair production with a photon $t\bar{t}\gamma$ represents an important process to further test the Standard Model. Among others, it allows to directly probe the electric charge of the top quark, as well as the top-photon coupling. Therefore, precise predictions are of utmost importance.
In this talk, I will discuss the application of QCD resummation techniques to...
The MUonE experiment at CERN aims to determine the leading-order hadronic contribution to the muon $g-2$, $a_\mu^{\rm HLO}$, by an innovative approach, using elastic scattering of 160 GeV muons on atomic electrons in a low-Z target. $a_\mu^{\rm HLO}$ is extracted from the precision measurement of the shape of the differential cross section of the muon-electron elastic process. The target...
The FCC-ee offers unparalleled opportunities for direct and indirect evidence for physics beyond the Standard Model (SM), via a combination of high precision measurements and searches for forbidden and rare processes. The precision measurement program benefits from an extraordinary conjunction of (i) very clean experimental conditions and excellent c.m. energy determination from the Z up to...
We discuss the experimental prospects for measuring differential observables in b-quark and c-quark production at the International Linear Collider (ILC) baseline energies, 250 and 500 GeV.
The study is based on full simulation and reconstruction of the International Large Detector (ILD) concept.
Two gauge-Higgs unification models predicting new high-mass resonances beyond the Standard...
Electroweak Precision Measurements are stringent tests of the Standard Model and sensitive probes to New Physics. Accurate studies of the Z-boson couplings to the first-generation quarks could reveal potential discrepancies between the fundamental theory and experimental data. Future e+e- colliders offering high statistics of Z bosons would be an excellent tool to perform such a measurement...
In the last 15 years the "Radio MontecarLow (โRadiative Corrections and Monte Carlo Generators for Low Energiesโ) Working Group (WG), see www.lnf.infn.it/wg/sighad/, has been providing valuable support to the development of radiative corrections and Monte Carlo (MC) tools for low energy e+e- data. By bringing together in more than 20 meeting experts working in the field of e+e- physics, the WG...
Monte Carlo (MC) generators are at the core of LHC data analyses, and will also play a paramount role at future lepton colliders offering high energies and luminosities. With an $e^+e^-$ Higgs factory at the horizon and studies on the physics potential of a muon collider ongoing, the development of MC generators has to be continuously improved to match the projected experimental...
We present an overview of the ${\tt KKMCee\; 5.00.2}$ Monte Carlo event generator for lepton and quark pair production for the high energy electron-positron annihilation process. We note that it is still the most sophisticated event generator for such processes. Its entire source code is re-written in the modern C++ language. We checked that it reproduces all features of the older ${\bf KKMC}$...
Since the start of the LHC, pinning down the properties of top quarks has been a vital point of the LHC research program. Only recently, it was understood how top-quark properties can even be used to probe quantum entanglement and by such study foundational problems of quantum mechanics at the LHC. In this talk, recent CMS measurements of top-quark properties and their interpretation in terms...
We present the first complete high-precision results for the top-quark decay width $\Gamma_t$, $W$-helicity fractions and semi-inclusive distributions for the top-quark decay process to the third order in the strong coupling constant $\alpha_s$. We find, in particular, that the pure $\mathcal{O}(\alpha_s^3)$ correction decreases $\Gamma_t$ by $0.8\%$ of the previous $\mathcal{O}(\alpha_s^2)$...
In this talk, I will present the results of the first calculation of open bottom production at hadron colliders at NNLO+NNLL, i.e. a next-to-next-to-leading-order calculation that resums collinear logarithms at next-to-next-to-leading-logarithmic accuracy. This new computation achieves significantly reduced theory errors compared to previous calculations, with errors of just a few percent at...
We discuss the sensitivity to quartic $\gamma \gamma \gamma \gamma$, $\gamma \gamma WW$, $\gamma \gamma ZZ$, $\gamma \gamma t \bar{t}$ anomalous couplings at the LHC via photon-induced processes. Tagging the intact protons allow improving the sensitivities by two or three orders of magnitude with respect to standard methods. We also discuss the sensitivity to Axion Like Particles production.
This talk will present the recent results from various analyses on signals containing intact protons measured by the CMS Precision Proton Spectrometer (PPS), which includes searches for New Physics in the electroweak sector. As the operation of the HL-LHC will require more stringent selection of intact protons due to the higher pileup, the PPS2 project will be presented and projections for...
The future collider LHeC is set to operate at a center-of-mass energy of 1.2 TeV and is anticipated to provide an integrated electron-proton luminosity of about 1 ab$^{-1}$. This talk will present a comprehensive survey of possible studies of high-energy photon-photon processes at the LHeC, for the $\gamma \gamma$ center-of-mass energy of up to 1~TeV. The scientific potential of studying such...
Vector boson scattering is a key production process to probe the electroweak symmetry breaking of the standard model, since it involves both self-couplings of vector bosons and coupling with the Higgs boson. If the Higgs mechanism is not the sole source of electroweak symmetry breaking, the scattering amplitude deviates from the standard model prediction at high scattering energy. Moreover,...
Measurements of diboson production in association with two additional jets at the LHC probe interactions between electroweak vector bosons predicted by the Standard Model and test contributions from anomalous quartic gauge couplings. The ATLAS experiment has recently performed such measurements in a variety of final states, amongst them the scattering into a massive electroweak gauge boson and...
This talk reviews recent measurements of multiboson production using CMS data at sqrt(s) = 13 and 13.6 TeV. Inclusive and differential cross sections are measured using several kinematic observables.
Measurements of multiboson production at the LHC are important probes of the electroweak gauge structure of the Standard Model and can constrain anomalous gauge boson couplings. In this talk, recent measurements of diboson production by the ATLAS experiment at 13 TeV and 13.6 TeV are presented. Studies of gauge-boson polarisation and their correlation in WW, WZ and ZZ events are also...
We show that testing Bell inequalities in $W^\pm$ pair systems by measuring their angular correlation suffers from the ambiguity in kinetical reconstruction of the dilepton decay mode. We further propose a new set of Bell observables based on the measurement of the linear polarization of the $W$ bosons that can be used in the semileptonic decay mode of $W^\pm$ pair, and we analyze the...
We consider the diphoton production in hadronic collisions at the next-to-next-to-leading order (NNLO) in perturbative QCD, taking into account for the first time the full top quark mass dependence. We present the computation of the two-loop form factors for diphoton production in the quark annihilation channel, that are relevant for the phenomenological studies of the full NNLO. The MIs are...
As shown by recent theoretical and experimental developments, the Standard Model of fundamental interactions can be tested at collider with the lens of quantum information theory. To achieve this aim it is essential to establish a relation between the kinematical distribution of stable, detectable particles and the spin-density matrix.
In the realistic simulation it is unavoidable to impose...
The top quark mass is a fundamental parameter of the SM. Its precise determination allows a powerful consistency check of the theory. About ten years after the completion of Run 1, ATLAS and CMS published the final combination of fifteen measurements at 7 and 8 TeV based on various final states and complementary techniques. In this talk, details of the combination, the systematic model, and...
The CMS Collaboration has carried out a rich program of top quark mass measurements, providing thorough tests of the internal consistency of the Standard Model. While direct measurements suffer from ambiguities in interpreting the measured parameter, extractions from cross-section measurements provide a solution to this problem with the drawback of being less precise and relying on the picture...
The top-quark mass is one of the key fundamental parameters of the Standard Model that must be determined experimentally. Its value has an important effect on many precision measurements and tests of the Standard Model. The Tevatron and LHC experiments have developed an extensive program to determine the top quark mass using a variety of methods. In this contribution, the top quark mass...
We generalize and update our former top quark mass calibration framework for Monte Carlo event generators based on the e+e- hadron-level 2-jettiness distribution in the resonance region for boosted top production. The updated framework includes the addition of the shape variables sum of jet masses, modified jet mass and the treatment of two more gap subtraction schemes to remove the leading...
Precision measurements of the top quark mass at hadron colliders have been notoriously difficult. Energy-Energy Correlators (EECs) provide clean access to angular correlations in the hadronic energy flux, but their application to the precision mass measurements is less direct since they measure a dimensionless angular scale.
Inspired by the use of standard candles in cosmology, I will show...
We discuss the possibility that light new physics in the top quark sample at the LHC can be found by investigating with greater care well known kinematic distributions, such as the invariant mass mbโ of the b-jet and the charged lepton in fully leptonic t ฬt events. We demonstrate that new physics can be probed in the rising part of the already measured mbโ distribution. To this end we analyze...
Effective Field Theory (EFT) provides a universal language for testing beyond the Standard Model physics at LHC scales. With increasing complexity and new sophisticated techniques, the sensitivity of these analyses could be significantly improved in past years. In this talk, recent searches for anomalous couplings in the top quark sector and their combination with other EFT results from CMS...
The production of a single top quark $t$ in association with a $W$ and a $Z$ boson receives large contributions from beyond-the-standard-model (BSM) theories, particularly through the electroweak interaction of the top quark. This talk presents a study on the sensitivity of the $tWZ$ process to such effects in the form of effective field theory (EFT) operators. The study is based on the...
We present theoretical results at approximate NNLO in QCD for top-quark pair-production total cross sections and top-quark differential distributions at the LHC in the SMEFT. These approximate results are obtained by adding higher-order soft gluon corrections to the complete NLO calculations. The higher-order corrections are large, and they reduce the scale uncertainties. These improved...
This study explores fully leptonic WZ and WW production within the SMEFT framework at NLO in QCD, focusing on both CP-even and CP-odd triple gauge coupling dimension-six operators. We investigate the off-shell production processes and contrast our findings with those derived under the narrow-width approximation. Alongside the conventional kinematical observables, we examine...
Accurate predictions for Standard Model and Beyond the Standard Model phenomena are fundamental to collider experiments. In this context, electroweak corrections, enhanced by Sudakov logarithms, emerge as the dominant higher-order effect at the TeV scale and beyond. We computed Sudakov EW corrections in the high-energy limit for the dimension-6 SMEFT operators that maximally grow with energy....
The Large Hadron-electron Collider and the Future Circular Collider in electron-hadron mode will make possible the study of DIS in the TeV regime providing electron-proton collisions with instantaneous luminosities of $10^{34}$ cm$^{โ2}$s$^{โ1}$. In this talk we will review the opportunities for measuring standard and anomalous top quark couplings, both to lighter quarks and to gauge bosons,...
