“…The microscopic origin of this striking phenomenon, historically interpreted as a signature of quark-gluon plasma (QGP) formation in heavy-ion collisions, is still unknown: is it related to soft particle production or to hard scattering events, such as jets? …”
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“…Afterwards, two new CMS PYTHIA8 tunes, CP5-CR1 and CP5-CR2, obtained respectively for the quantum chromodynamics-inspired and gluon-move colour reconnection (CR) models in PYTHIA8, are introduced. …”
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“…Finally, this search sets the first LHC limits on a dark quantum chromodynamic sector that couples to the Higgs boson through gluon, Higgs, photon, vector, and dark photon portals, and is sensitive to branching fractions of the Higgs boson to dark quarks as low as $10^{-3}$.…”
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“…When considering heavy-ion collisions, quarkonium polarization could also be used to investigate the characteristics of the hot and dense medium (quark–gluon plasma) created at LHC energies. In ALICE, this observable was extracted for the first time in Pb–Pb collisions and a significant difference with respect to a corresponding measurement in pp collisions by the LHCb was found. …”
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“…Thermal radiation from the hadronic phase contributes to the spectrum at low invariant mass ($m_{\rm ee}$), while thermal radiation from the quark-gluon plasma (QGP) at larger $m_{\rm ee}$ carries information about the early temperature of the medium. …”
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“…For light partons, energy loss via gluon bremsstrahlung is expected to dominate, while for heavy-quark-initiated jets, collisional energy loss may play a more important role. …”
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“…We propose to identify the jet origin using deep learning tools for experiments at the high energy frontier, where jet origins are categorized into 5 species of quarks, i.e., $b,c,s,u,d$, 5 species of anti-quarks, i.e., $\bar{b},\bar{c},\bar{s},\bar{u},\bar{d}$, and gluons. Using simulated physics events at the Circular Electron Positron Collider and the ParticleNet algorithm, we quantify the performance of jet origin identification using an 11-dimensional confusion matrix. …”
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“…The complete two-loop correction to the quark propagator, consisting of the spider, rainbow, gluon bubble and quark bubble diagrams, is evaluated in the non-covariant light-cone gauge (LCG), n.A/sup a/(x)=0, n/sup 2/=0. …”
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“…We found a substantial deviation from QCD factorization, namely, gluon shadowing is much stronger for charmonium production than it is in DIS. …”
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Enlace del recurso

“…New, radiatively generated, LO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. …”
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Enlace del recurso

“…Relating the transport coefficient to the energy density produced in the collision region, we find and discuss a phenomenon reminiscent of the opacity problem of elliptic flow: namely, the interaction of the hard parent parton with the medium appears to be much stronger than that expected for perturbative interactions of the hard parton with an ideal quark gluon plasma.…”
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Enlace del recurso

“…In order to distinguish the two most likely spin hypotheses, spin-0 or spin-2, the phenomenology of light spin-2 resonances produced in different gluon-fusion and vectorboson-fusion processes at the LHC is studied. …”
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“…ALICE (A Large Ion Collider Experiment) is studying heavy-ion collisions at the CERN LHC, with the aim of forming, under extreme conditions of temperature and energy density, a Quark-Gluon Plasma (QGP) and studying its properties. The ALICE Collaboration is preparing a major upgrade of the experimental apparatus, planned for installation in the second long LHC shutdown in the years 2018–2019. …”
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“…In the MSSM, neutral Higgs bosons are produced predominantly in gluon fusion events and in association with b-quarks. …”
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“…ALICE (A Large Ion Collider Experiment) is designed to study the strongly-interacting medium created in heavy-ion collisions at LHC energies, the Quark-Gluon Plasma (QGP). Charm and beauty quarks are powerful probes to study the QGP in heavy-ion collisions: produced in hard partonic scattering processes on a short time scale, they are expected to traverse the QCD medium, interacting with its constituents and losing energy through radiative and collisional processes. …”
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“…A Large Ion Collider Experiment (ALICE) is the heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma at the CERN Large Hadron Collider (LHC). …”
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“…The Large Ion Collider Experiment (ALICE) at CERN has been designed to study matter at extreme conditions of temperature and pressure, with the long term goal of observing deconfined matter (free quarks and gluons), study its properties and learn more details about the phase diagram of nuclear matter. …”
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“…ALICE (A Large Ion Collider Experiment) is the heavy-ion detector designed to study the physics of strongly interacting matter and the quark-gluon plasma at the CERN Large Hadron Collider (LHC). …”
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“…The Quark-Gluon Plasma (QGP) is a strongly interacting matter with high temperature and energy density, where partons are deconfined. …”
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“…The main goal of the Collaboration is to study the properties of the phase transition between confined matter and quark-gluon plasma by performing a two-dimensional scan of the phase diagram of strongly interacting matter. …”
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