“…The $v_n$ distributions are compared with the eccentricity distributions from two initial geometry models: a Glauber model and a model that includes corrections to the initial geometry due to gluon saturation effects. Both models fail to describe the experimental data consistently across the full centrality range. …”
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“…This phase, characterized by a deconfinement of quarks within hadrons, is called QGP (Quark Gluon Plasma). The muon spectrometer of the ALICE experiment (A Large Ion Collider Experiment) aims at investigating the propertiesof the QGP at the extreme energy density reached in heavy ion collisions at LHC (Large Hadron Collider). …”
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“…The helicity distributions for the three lightest quark and antiquark flavours extracted from the measured double spin asymmetries for production of charged pions and kaons in semi-inclusive deep-inelastic scattering are also presented and discussed. The gluon polarization in the nucleon was determined using open charm production or high transverse-momentum hadron pairs production in polarized muon scattering off longitudinally polarized target.…”
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“…It will be possible to explore in great detail phenomena discovered or hinted at in the course of experiments at the Relativistic Heavy Ion Collider, in particular the signals of the quark-gluon plasma. One of the most promising signals of the creation of this new state of matter is the anomalous suppression of the Υ (bb) and J/v(cc) families. …”
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“…The latter approximate higher order real-emission matrix elements and thus generate medium-induced gluon emissions. The interplay between different emissions is governed by their formation times. …”
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“…The main goal is the search for exotic bound states of quarks and gluons (glueballs, hybrids) and several preliminary results from the ongoing analysis have already emerged. …”
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“…Proton-proton collisions are also used as a reference for nuclear collisions of different multiplicities in the study of Quark-Gluon Plasma (QGP) formation. The increase of strangeness production is considered an important observable of the QGP. …”
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“…Key ingredients for such computations are scattering amplitudes, the quantum-mechanical transition amplitudes between the incoming quarks and gluons and the outgoing produced particles. To go beyond leading order, we need both classical tree amplitudes and quantum loop amplitudes. …”
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“…The cross section ratio between vector boson mediated and gluon initiated Higgs boson production processes is found to be $\mu_{\mathrm{VBF}+VH}/\mu_{\mathrm{ggF}+t\bar{t}H} = 1.2^{+0.7}_{-0.5}$, giving more than 3$\sigma$ evidence for Higgs production through vector-boson fusion. …”
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“…Astrophys. 473, 11, 2007}] and here it has been upgraded to handle the physics of the Quark-Gluon Plasma. ECHO-QGP features second-order treatment of causal relativistic viscosity effects in both Minkowskian or Bjorken coordinates; partial or complete chemical equilibrium of hadronic species before kinetic freeze-out; initial conditions based on the optical Glauber model, including a Monte-Carlo routine for event-by-event fluctuating initial conditions; a freeze-out procedure based on the Cooper-Frye prescription. …”
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“…In particular, the non-trivial topological configurations of the gluon field induce a non-dissipative electric current in the presence of a magnetic field. …”
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Enlace del recurso

“…ALICE (A Large Ion Collider Experiment) is the heavy-ion detector studying the physics of strongly interacting matter and the quark-gluon plasma at the CERN LHC (Large Hadron Collider). …”
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Enlace del recurso

“…Measurement of the cross-sections, relative the SM expectations, from the different production modes, either via fermions (gluon fusion, ttH) or vector bosons (VBF, VH) are also reported. …”
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“…At these temperatures, 100,000 times hotter than the center of the sun, the strong force is dominant, and we hope to learn about the fundamental and non-trivial emergent many-body dynamics of the quarks and gluons that make up 99% of the mass of the visible universe. …”
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“…The experimental signature in this search is two leptons (e or $\mu$), two jets coming from decays of bottom quarks, and two jets coming from light flavor quarks or gluons. Resonant decay candidates reconstructed from these objects are studied. …”
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“…In particular, they enable the study of QCD at high temperatures and provide accessibility to a medium, the Quark-Gluon Plasma (QGP), containing a high density of unscreened color charges. …”
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“…At intermediate transverse momentum, it allows for testing the ”recombination models” where hadrons could be formed by the coalescence of quarks from a deconfined quark-gluon plasma (QGP). At higher transverse momenta, particle spectra allow one to investigate the mechanism of parton energy loss in the hot and dense hadronic medium. …”
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“…The $4\ell$ analysis uses the ZZ invariant mass distribution as well as a matrix element likelihood discriminant to separate the ZZ components originating from gluon- and quark-initiated processes. The $2\ell 2\nu$ analysis relies on the transverse mass or missing transverse energy distributions in jet categories. …”
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“…An asymmetry $A_c^y=(0.15\pm0.42)\%$ is measured in the difference of absolute rapidities of top-antitop pairs, of which $(0.00\pm0.43)\%$ is attributable to quark-antiquark initial states, and $(0.18\pm0.15)\%$ is attributable to quark-gluon initial states. The first measurement of the transverse top quark charge asymmetry is also presented, with the result $A_c^\phi=(0.44\pm0.50)\%$. …”
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“…The analysis of j_{T} in p–Pb collisions, for which ALICE has a high quality data set, lays bases for later extension to pp and Pb–Pb data in order to study the induced gluon radiation. Additionally, the yields of \pi^0 meson were studied in Pb–Pb sqrt(s_{NN}) = 2.76 GeV collision. …”
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