This talk reviews the current theory status of top-quark production at the LHC.
The production of top-quarks, the heaviest elementary particle known, is studied in great
detail by the experiments ATLAS and CMS. It provides unique possibilities to extend our
knowledge about the Standard Model and beyond. To make most of the precise data
available, precise theory predictions for...
Latest results on inclusive top quark pair production cross sections are presented using proton-proton collision data collected at the LHC. 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 also discussed. These measurements, including results...
A comprehensive set of measurements of top quark pair and single top quark production in association with EWK bosons (W, Z or ɣ) is presented. The results are compared to theory predictions and re-interpreted as searches for new physics inducing deviations from the standard model predictions using an effective field theory approach. The status of the search for four top quark production, to...
I give an overview talk on recent theoretical studies of top quark properties. Starting from basic quantities such as the top quark mass and spin correlations, I discuss more sophisticated quantities related to the electroweak interactions and dipole moments. These couplings can be probed at the LHC in a multitude of different ways. I will present some of the most recent ideas and proposals.
Measurements of top quark properties using data collected by the LHC are presented. Among them, latest results on top mass, ttbar spin correlations and charge asymmetries will be discussed.
Latest results on inclusive and differential single top quark production cross sections are presented using proton-proton collision data collected by the LHC. The single top quark analyses investigate separately the production of top quarks via t-channel exchange, in association with a W boson (tW) or via the s-channel. Final states with at least one charged lepton and one b-jet are explored...
Beauty production in events containing two muons in the final state has been measured with the ZEUS detector at HERA II. A low transverse-momentum threshold for muon identification, in combination with the large rapidity coverage of the ZEUS muon system and the upgraded ZEUS tracker, gives access to almost the full phase space for beauty production. The total cross section for beauty...
The spectroscopy of excited hadronic states in the beauty sector, double heavy hadrons and quarkonia provides a rich proofing ground for effective theories of the strong interaction. The decays of these states also provide a source of exotic hadrons, especially in the charmonium mass region. The unique data samples collected during Run I and II of the LHC open new possibilities for precision...
The largest data sample accumulated by the Belle experiment at KEKB asymmetric energy e+e- collider provides an opportunity to perform studies of hadron spectroscopy. We present new measurements on charmed baryons
such as Xi_c^0, Lambda_c, as well as other charmed mesons and strange baryons.
In this presentation, we also cover recent results on hadron spectroscopy from Babar and BES III.
The spectroscopy of charm baryons provides a rich proving ground for effective theories of the strong interaction. This talk will present recent measurements of charmed baryons at LHCb, BESIII, and Belle. Discoveries of previously unobserved states in recent years will be discussed, along with precise determinations of the properties of known states.
Recent years tremendous progress has gained in the study of the exotic states (so called XYZ) in both experiment and theory。 In this talk, we will review the experimental results of the XYZ study.
The Belle II experiment at the SuperKEKB energy-asymmetric $e^+e^-$collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. From February to July of this year, the machine...
We review theoretical approaches to heavy flavor and quarkonium production mechanisms in hadron colliders. We discuss the application of the factorization theorem to heavy flavor production, and introduce implementations of the formalism in phenomenological calculations. For heavy quarkonium production, we give an overview of various production mechanisms, including phenomenological models and...
The LHCb experiment allows to measure the production and polarisation of charm and beauty hadrons including quarkonia in various collision systems in collider and fixed-target mode. The forward rapidity acceptance in the laboratory frame and the covered Q^2 range test perturbative QCD calculations with their factorisation assumptions and put constraints on parton densities in unique kinematic...
Associated production of vector boson with quarkonia is a key observable for understanding the quarkonium production mechanisms, including the separation of single and double parton scattering components.
This talk will present the latest differential measurements from ATLAS of associated-quarkonium production.
In addition, recent results on heavy flavour production measurements are reported...
We discuss the QCD predictions for the radiative decay $B\to \gamma \ell \nu_\ell$ with an energetic photon in the final state by taking into account the $1/E_\gamma, 1/m_b$ power-suppressed hard-collinear and soft corrections from higher-twist $B$-meson light-cone distribution amplitudes (LCDAs). The soft contribution is estimated through a dispersion relation and light-cone QCD sum rules....
Measurements with hadrons containing heavy quarks are indispensable when studying the properties of the medium created in high-energy nuclear collisions. High-statistics data collected by experiments at RHIC and LHC allow to perform comprehensive studies of the hot and dense QCD matter using heavy quarks as probes and put under scrutiny models describing various aspects of production of...
Quarkonium states are powerful tools to study the properties of thequark-gluon plasma (QGP), since their production is strongly affected by the dense and hot medium created in heavy-ion collisions.
In nucleus-nucleus interactions at LHC energies, charmonia reveal a smaller suppression with respect to the one measured at lower energies, as at RHIC and SPS. This observation points to the...
In the context of the Standard Model (SM) of particle physics, the relationship between the mass of top quark and its width has been precisely calculated. However, the uncertainty from current direct measurements of the width is nearly 50%. A new approach for directly measuring the top quark width is presented, using events away from the resonance peak.
We calculate the cross section for the production of $D$ mesons and $\Lambda_{c}$ baryons in pp collisions at the LHC. The cross section for production of $c\bar c$ pairs is calculated within the $k_{T}$-factorization approach. We show that our approach well describes the $D^0$, $D^+$, and $D_s$ experimental data. We try to understand recent ALICE and LHCb data for $\Lambda_{c}$ production...
We explore how the positivity of the $P_T$-integrated $\eta_c$-hadroproduction cross section computed at NLO in $\alpha_s$ can set up constraints on the $x$ dependence of both gluon PDFs and TMDs at low scales. We also discuss the phenomenological implications on other quarkonium-production cross sections computed at NLO in both collinear and TMD factorisations.
Due to the large masses of the charm and bottom quarks, their production cross sections are calculable within the perturbative QCD. This makes the heavy-quark mesons important observables in high-energy collisions of protons and nuclei. However, the available calculations for heavy-flavored-meson hadroproduction have been somewhat problematic in reliably describing the cross sections across...
The recent intriguing hints for new physics in semi-leptonic B decays point towards lepton flavor universality (LFU) violating extensions of the SM. Prime candidates for such new particles are leptoquarks which can provide the desired effects. After a review of the current experimental and theoretical situation, the phenomenology of the vector leptoquark SU(1) singlet, which was proposed...
The concept of lepton universality, where the muon and tau particles are simply heavier copies of the electron, is a key prediction in the Standard Model (SM). In models beyond the SM, lepton universality can be naturally violated with new physics particles that couple preferentially to the second and third generation leptons. Over the last few years, several hints of lepton universality...
Measurements of the production cross-section of top-antitop quark pairs with additional jets provide important tests of quantum chromodynamics (QCD) predictions.
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...
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....
Heavy quarks (charm and beauty) are unique probes for studies of the properties of the Quark-Gluon Plasma (QGP) formed in high-energy Pb--Pb collisions, since they are almost exclusively produced in hard scattering processes in the initial stages of the collision and thus experience the full evolution of the QGP.
In order to distinguish the effects of the QGP from possible Cold Nuclear Matter...
Differential measurements of top quark pair (tt) and single top quark (t-channel) 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. For the first time,...
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 decay almost 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...
Measurements of the inclusive and differential top-quark pair 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 also...
