“…Identification of the hadronically decaying top-quark is done using jet substructure tagging techniques based on the shower deconstruction algorithm. …”
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“…The ATLAS collaboration has performed new measurements for $W^+$, $W^-$ and $Z/\gamma^*$ boson production, reaching unprecedented precision and strong constraints on parton distribution functions, in particular the strange quark density. Studying jet production in association with a vector boson, perturbative QCD predictions can be tested in a multi-scale environment. …”
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“…Second-generation leptoquarks with masses less than $1530~\mathrm{GeV}$ ($1285~\mathrm{GeV}$) are excluded for $\beta$=1.0 (0.5), where $\beta$ is the branching fraction of a leptoquark decaying to a charged lepton and a quark. These limits are the most stringent to date on the masses of second-generation leptoquarks. …”
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“…Jet substructure techniques and top quark identification algorithms are used for the object reconstruction. …”
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“…These include important analyses of Higgs boson physics, with the highlight being the first observation of the $\mathrm{t\bar{t}H}$ production of the Higgs boson, along with analyses pertaining to precision standard model measurements, top quark physics, with the single top production cross section measurement, and flavour physics, with the important observation of $\chi_{b}$(3P) states. …”
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“…This note also presents the performance studies at the HL-LHC for analyses of inclusive Z boson, dijet, and top quark pair production in proton-lead collisions at $\sqrt{\smash [b]{s_{_{\mathrm {NN}}}}}=8.16$ TeV for an integrated luminosity of 2 $\mathrm{pb}^{-1}$.…”
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“…Jet kinematics, jet substructure, and underlying event measurements in top quark pair events are discussed. New CMS PYTHIA 8 event tunes exploiting Monte Carlo configurations with consistent parton distribution functions and strong coupling parameter values in the matrix element and the parton shower, at leading order (LO), next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) are presented. …”
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“…The dominant background of this analysis consists of top-quark pair production and W/Z+jets production with the vector boson decay producing at least one lepton. …”
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“…Bottomonium, a bound state of a bottom quark and its antiquark, is an excellent probe of the hot and dense medium created in heavy-ion collisions at LHC. …”
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“…--HTML-->We study chemical equilibration in out-of-equilibrium Quark-Gluon Plasma using the QCD effective kinetic theory in longitudinally expanding systems. …”
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“…The former is entirely determined by the X(3872)'s mass and the previously calculated charm-quark fugacity. The key new parameter is the reaction rate, believed to depend on the structure of the X(3872) particle ("large" for a DD* molecule and "small" for a diquark-antidiquark bound state). …”
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“…In lepton colliders, it gives a precise determination of the line-shape production of the J/ψ, the Z and the Higgs bosons, while in QCD it allows a realistic description of quark and gluon jets, of the transverse momentum distribution of W, Z and H produced in hadron collisions, and other related quantities. …”
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“…A comparison of several algorithms that combine individual subjet discriminants show that the neural network-based algorithm is the most powerful, assessed on its ability to reject both boosted top quark jets and jets arising from multijet processes.…”
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“…Hard probes are indispensable tools to study the hot and dense quark-gluon matter created in ultra-relativistic heavy-ion collisions. …”
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“…The higher centre-of-mass energy and increased integrated luminosity will allow ATLAS not only to improve the precision of Higgs boson, electroweak boson, and top quark measurements, but also to extend the sensitivity of searches for beyond-the-Standard-Model processes with small cross sections. …”
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“…--HTML-->Direct photons are emitted unscathed from all the stages of the relativistic heavy ion collisions and therefore are an excellent probe to study the properties of Quark Gluon Plasma (QGP) as they do not interact strongly with the medium. …”
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“…These include measurements of vn-[pT] correlations in Xe+Xe and Pb+Pb, which carry important information about the initial-state geometry of the Quark-Gluon Plasma and can potentially shed light on any quadrupole deformation in the Xe nucleus; measurements of flow decorrelations differential in rapidity, which probe the longitudinal structure of the colliding system; and measurements of the sensitivity of collective behavior in pp collisions to the presence of jets, which seek to distinguish the role that semi-hard processes play in the origin of these phenomena in small systems. …”
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“…These include measurements of vn-[pT] correlations in Xe+Xe and Pb+Pb, which carry important information about the initial-state geometry of the Quark-Gluon Plasma and can potentially shed light on any quadrupole deformation in the Xe nucleus; measurements of flow decorrelations differential in rapidity, which probe the longitudinal structure of the colliding system; and measurements of the sensitivity of collective behavior in pp collisions to the presence of jets, which seek to distinguish the role that semi-hard processes play in the origin of these phenomena in small systems. …”
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“…The range of investigated coupling partners needs to be extended to also include the charm quark. The main challenge hereby is to differentiate between background from QCD processes and signal events. …”
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“…The DeepTau identification algorithm is used to identify hadronically decaying tau leptons from quark and gluon induced jets, electrons, and muons. …”
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