Description
The focus of the session is on top quarks precision measurements and theory calculations.
Conveners:
Gauthier Durieux (CERN)
Abideh Jafari (DESY)
Narei Lorenzo Martinez (LAPP, Annecy)
Contact: eps23-conveners-t07 @desy.de
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Duration" 15'+5'
A large fraction of the top quarks produced at the LHC emerges from electroweak interactions, via the so-called t-channel single-top production.
Predictions for this process can be used, for instance, to constrain
the CKM matrix element, and probe possible anomalous couplings
in the tWb vertex. QCD corrections to t-channel single-top production
are known up to NNLO...
Duration: 15'+5'
We compare double-differential normalized production cross-sections for top-antitop + X hadroproduction at NNLO QCD accuracy, as obtained through a customized version of the MATRIX framework interfaced to PineAPPL, with recent data by the ATLAS and the CMS collaborations.
We take into account theory uncertainties due to scale variation and we see how predictions vary as a...
15'+5'
Duration: 15+5'
The comparison of theory predictions and experimental measurements is one of the main roads for discovering physics beyond the Standard Model. The tremendous amount of data that has been and will be further collected at the LHC already demands a high level of precision from the theory predictions.
In this talk I will focus on ttZ production, whose phenomenological interest is...
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Duration: 15'+5'
Current measurements of the top mass have achieved a precision of less than 500 MeV. However, these measurements, relying on Monte Carlo Simulations, are affected by the top mass interpretation problem, introducing a theory uncertainty of $\mathcal{O}$(1 GeV). To address this challenge, accurate first principles calculations in short distance schemes are needed, allowing...
Duration: 15'+5'
The precise measurement of the properties of the top quark are among the most important goals of the LHC. The signature of top quarks can only be measured through their decay products, which are almost exclusively a W-boson and a b-quark, and unbiased measurements of the top-quark pair production process are therefore performed in the final state of two W-bosons and two...
Duration: 15'+5'
The simulation of processes involving heavy unstable particles, like the top quark, holds significant importance in LHC physics. In this contribution, we address the exclusive simulation of top-quark pair production with dileptonic decays, including the non-resonant diagrams, interferences, and off-shell effects arising from the finite top-quark width. Our simulations,...
Duration: 15'+5'
With the help of the pole approximation, observables with polarised intermediate resonances can be calculated. Gauge-boson-pair production represents a particularly interesting class of processes to study polarisation. The definition of polarised signals at amplitudue level has enabled successful phenomenological studies of leptonically decaying vector bosons. The natural...
Duration: 15'+5'
The LHCb experiment covers the forward region of proton-proton collisions, and it can study the W and Z bosons in this phase space complementary to ATLAS and CMS. Measurements of W and Z bosons production cross sections in this region are unique and important tests of the Standard Model.
Thanks to the excellent detector performance, fundamental parameters of the Standard...
Duration: 15'+5'
This paper presents a comprehensive study of currently available measurements of the mass of the W boson. The study uses results from the hadron colliders Tevatron and LHC, performed by the CDF, D0, ATLAS and LHCb experiments, and includes the combined result from LEP-2. As the measurements were performed at different moments in time, different assumptions for the modelling...
Duration: 15'+5'
Measurements of neutral current Drell-Yan production at large invariant dilepton masses can be used to test the energy scale dependence (running) of the electroweak mixing angle.
In this work, we make use of a novel implementation of the full next-to-leading order electroweak radiative corrections to the Drell-Yan process using the $\overline{\mathrm{MS}}$ renormalization...
Duration: 15'+5'
In this talk we will review the most recent global analysis of electroweak data, in the Standard Model and beyond, as obtained in the HEPfit framework. Based on arXiv:2204.04204, this analysis include the most recent measurements of the W-boson mass (CDF and ATLAS) and of the top-quark mass (CMS). Moreover, we will present preliminary results of a global fit of the SMEFT that...
Duration" 15'+5'
We present results from the global electroweak fit to precision measurements of the Standard Model (SM). The fit uses the latest experimental results as well as up-to-date theoretical calculations for observables on the Z pole and the W boson mass, yielding precise SM predictions for the effective weak mixing angle and the masses of the W and Higgs bosons, as well as the top...
Duration: 15'+5'
The ATLAS experiment has performed extensive searches for rare Standard Model processes involving top quarks. In this contribution two recent highlights of this programme are presented. The top-quark pair production in association with a W boson is a difficult process to calculate and model and is one of the leading sources of same-sign and multi-lepton events. To improve our...
15'+5'
The top quark is hypothesized in many BSM models to have enhanced, non-standard or rare interactions with other SM or BSM particles. This presentation covers the latest CMS direct results in this regard, including the tests of lepton flavor violations and baryon number violations, including FCNC searches.
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Duration: 15'+5'
Effective Field Theories (EFTs) provide a framework for capturing the effects of yet unseen heavy degrees of freedom in a model-independent manner. However, constructing a complete and minimal set of operators, especially at higher mass dimensions, is challenging.
In this talk, we present $\texttt{AutoEFT}$, an implementation of an algorithm that systematically handles...
Duration: 15'+5'
The top quark sector provides valuable constraints on SMEFT operators. This talk will focus on top quark measurements directly targeting constraints on EFT, as well as interpretations of differential or inclusive measurements in the EFT framework.
Duration: 15'+5'
The Standard Model effective field theory (SMEFT) provides a general framework to describe the Beyond standard model physics expected to be valid upto certain higher energy scale, say $\Lambda$. It is quite demanding and challenging too, to explore the signature of this kind of generalised theory. In order to explore it, we concentrate on the modifications of top quark...
Duration: 12'+3'
We assess the impact of top quark production at the LHC on global analyses of parton distributions (PDFs) and of Wilson coefficients in the SMEFT, both separately and in the framework of a joint interpretation. We consider the broadest top quark dataset to date containing all available measurements based on the full Run II luminosity. First, we determine the constraints that...
Duration: 12'+3'
Recasting phenomenological Lagrangians in terms of SM effective field theory (SMEFT) provides a valuable means of connecting potential BSM physics at momenta well above the electroweak scale to experimental signatures at lower energies. In this work we jointly fit the Wilson coefficients of SMEFT operators as well as the PDFs using jet and top quark pair data, obtaining...
Duration: 15'+5'
We present a global analysis of Beauty, Top, Z, and Drell-Yan measurements within the framework of the Standard Model effective field theory (SMEFT). We use the minimal flavor violation (MFV) assumption and perform a combined analysis of up to 14 Wilson coefficients. We demonstrate that the combination of measurements from different sectors yields stronger constraints on the...
Duration: 15'+5'
Top quarks and in general heavy quarks are likely messengers to new physics. The scrutiny of these particles properties must be completed by the measurement of electroweak qqbar production at high energies, in particular for the top. Projects as the International Linear Collider will offer an the extremely favorable and low-background environment of e+e- annihilation and high...
Duration: 15'+5'
As the heaviest particle of the Standard Model, with a mass close to the electroweak scale, the top quark is an interesting candidate to look for hints of new physics. The electroweak couplings of the top quarks are specially relevant in many extensions of the Standard Model. Thanks to the data from the Large Hadron Collider, these couplings are currently being studied with...
Duration: 14'+4'
The Large Hadron-electron Collider and the Future Circular Collider in electron-hadron mode [1] will make possible the study of DIS in the TeV regime providing electron-proton collisions with instantaneous luminosities of $10^{34}$ cm$^{−2}$s$^{−1}$. In this talk we will review the opportunities for measuring standard and anomalous top quark couplings, both to lighter quarks...
Duration: 14'+4'
The Future Circular Collider (FCC) is a post-LHC project aiming at direct and indirect searches for physics beyond the SM in a new 91 km tunnel at CERN. The FCC with electron-positron beams (FCC-ee) will provide measurements of the Z and W bosons couplings and masses 1--3 orders of magnitude better than the present state-of-the-art. With the run around the Z pole, where the...
Duration: 14'+4'
The bound state of two tau leptons, ditauonium $\mathcal{T}$, is the heaviest and also most compact QED atom, and remains unobserved to date. There are several motivations for its study such as precisely extracting properties of the tau lepton, carrying out novel tests of SM and its basic CPT symmetries, and searching for BSM effects impacting the tau lepton. We will first...
Duration: 14'+4'
Future Higgs Factories will allow the precise study of $e⁺e⁻\rightarrow q\bar{q}$ with $q=s,c,b,t$ interactions at different energies, from the Z-pole to high energies never reached before.
In this contribution, we will discuss the experimental prospects for the measurement of differential observables in $e⁺e⁻\rightarrow b\bar{b}$ and $e⁺e⁻\rightarrow c\bar{c}$ processes at...
Duration: 14'+4'
The LUXE experiment (Laser Und XFEL Experiment) is an experiment in planning at DESY Hamburg using the electron beam of the European XFEL. LUXE is intended to study collisions between a high-intensity optical laser pulse and 16.5 GeV electrons from the XFEL electron beam, as well as collisions between the laser pulse and high-energy secondary photons. This will elucidate...
Duration: 12'+3'
One of the most intriguing indication of a theory beyond the Standard Model is the well-known discrepancy between the theoretical prediction of the muon anomalous magnetic moment $a_\mu = (g-2)_\mu/2$ and its experimental value. Another possible explanation for this inconsistency is the incorrect evaluation of the Hadronic Leading Order (HLO) contribution $a_\mu^{HLO}$, which...
Duration: 12'+3'
The MUonE experiment aims to measure the differential cross section of the $\mu e$ elastic scattering using the CERN SPS muon beam with mean energy of 160 GeV onto atomic electrons of a low-Z target. Thanks to the intense M2 beam with in-spill intensity of $5 \times 10^7$ muons/s, a precise measurement of the scattering angles allows to extract the running QED coupling, and...
The effective electroweak mixing angle has been measured with high precision in hadron collider experiments at the Tevatron and the LHC. These measurements use different sets of parton distribution functions (PDFs) and theoretical frameworks. This fact, together with unknown correlations, makes a concise combination of these measurements impossible. We present a study of the dominant source of...
