BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Geometrical clusterization of Polyakjov loops in SU(2) lattice g luodynamics DTSTART;VALUE=DATE-TIME:20161013T130500Z DTEND;VALUE=DATE-TIME:20161013T132500Z DTSTAMP;VALUE=DATE-TIME:20260811T202222Z UID:indico-contribution-73-745@cern.ch DESCRIPTION:Speakers: Oleksii Ivanytskyi (Bogolyubov Institute for Theoret ical Physics of NAS of Ukraine)\nThe liquid droplet formula is applied to an analysis of the properties of geometrical (anti)clusters formed in SU(2 ) gluodynamics by the Polyakov loops of the same sign. Using this approach \, we explain the phase transition in SU(2) gluodynamics as a transition b etween two liquids during which one of the liquid droplets (the largest cl uster of a certain Polyakov loop sign) experiences a conden-sation\, while another droplet (the next to the largest cluster of the opposite sign of Polyakov loop) evaporates. The clusters of smaller sizes form two accompan ying gases\, which behave oppositely to their liquids. The liquid droplet formula is used to analyze the size distributions of the gas (anti)cluster s. The fit of these distributions allows us to extract the temperature dep endence of surface tension and the value of Fisher topological exponent fo r both kinds of gaseous clusters. It is shown that the surface tension coe fficient of gaseous (anti)clusters can serve as an order parameter of the deconfinement phase transition in SU(2) gluodynamics. The Fisher topologic al exponent of (anti)clusters is found to have the same value 1:806 0:008. This value disagrees with the famous Fisher droplet model\, but it agrees well with an exactly solvable model of nuclear liquid-gas phase transitio n. This finding may evidence for the fact that the SU(2) gluodynamics and this exactly solvable model of nuclear liquid-gas phase transition are in the same universality class.\n\nKewords: geometrical clusters\, size distr ibutions\, liquid droplet model formula\,\nsurface tension\n\nhttps://indi co.particle.mephi.ru/event/4/contributions/745/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/745/ END:VEVENT BEGIN:VEVENT SUMMARY:Direct photon and neutral pion production in pp\, p-Pb and Pb-Pb c ollisions measured with the ALICE experiment at LHC DTSTART;VALUE=DATE-TIME:20161013T134500Z DTEND;VALUE=DATE-TIME:20161013T140500Z DTSTAMP;VALUE=DATE-TIME:20260811T202222Z UID:indico-contribution-73-713@cern.ch DESCRIPTION:Speakers: Dmitri Peresunko (Kurchatov Institute)\nMeasurements of direct photon and neutral pion production in heavy-ion collisions prov ide a comprehensive set of observables characterizing properties of the ho t QCD medium. Unlike hadrons\, direct photons are produced in all stages o f a nucleus-nucleus collision and therefore probe the initial state of the collision as well as the space-time evolution of the produced medium. Pro mpt direct photons provide means to control the initial stage of the colli sion and ensure that the yield suppression of hard hadrons and in particul ar neutral pions in Pb-Pb collision is a final-state effect and should be attributed to the parton energy loss in the hot medium. The thermal direct photon spectrum and flow carry information about temperature and space-ti me evolution of the emitting medium. Measurements of neutral meson spectra in pp collisions at energies $\\sqrt{s}$=0.9\, 2.76\, 7 TeV serve a refer ence for heavy-ion collisions\, and also provide valuable data for pQCD ca lculations and for studying scaling properties of hadron\nproduction at th e LHC energies. \n\nThe ALICE experiment at LHC reconstructs photons via c omplementary methods\, using the ALICE electromagnetic calorimeters and th e central tracking system identifying photons converted to $e^+e^-$ pairs in the material of the inner barrel detectors. Neutral pions are reconstru cted using their two-photon decays. Since calorimetric and tracking approa ches have practically independent systematic uncertainties\, their compari son provides a strong cross-check. In this talk\, we review recent ALICE r esults on neutral pion and direct photon production in pp\, p-Pb and Pb-Pb collisions.\n\nhttps://indico.particle.mephi.ru/event/4/contributions/713 / LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/713/ END:VEVENT BEGIN:VEVENT SUMMARY:Evidences of quark-gluon plasma formation in central nuclear colli sions DTSTART;VALUE=DATE-TIME:20161013T124500Z DTEND;VALUE=DATE-TIME:20161013T130500Z DTSTAMP;VALUE=DATE-TIME:20260811T202222Z UID:indico-contribution-73-684@cern.ch DESCRIPTION:Speakers: Violetta Sagun (Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine)\nBased on the new fit of hadron yield ratios within the multicomponent hadron resonance gas model we have found several remarkable irregularities at chemical freeze- out. In particular\, 121 hadron multiplicity ratios measured in the nucleu s-nucleus collisions at AGS\, SPS and RHIC energies were successfully desc ribed within the new formulation of HRGM with $\\chi^2/dof \\simeq 63.978 /65 \\simeq 0.98$.\nA dramatic jump in the center of mass collision energy dependence of pressure\, energy density and baryonic charge density in t he narrow range between 4.3 and 4.9 GeV is found. These irregularities ar e also accompanied by a sudden increase of the particle decays at chemica l freeze-out which is seen at this collision energy range. \n\nWe argue t hat a strong correlation which we observe between the previously found irr egularities and an enhancement of strangeness production can serve as the quark-gluon plasma formation signature. Thus\, we conclude that a dramatic change in the system properties seen in the narrow collision energy range $\\sqrt{s_{NN}} = 4.3-4.9 $ GeV opens entirely new possibilities for expe rimental studies of quark-gluon plasma properties at NICA JINR and FAIR GSI accelerators.\n\nhttps://indico.particle.mephi.ru/event/4/contribution s/684/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/684/ END:VEVENT BEGIN:VEVENT SUMMARY:Axial anomaly and energy dependence of hyperon polarization in Hea vy-Ion Collisions DTSTART;VALUE=DATE-TIME:20161013T140500Z DTEND;VALUE=DATE-TIME:20161013T142500Z DTSTAMP;VALUE=DATE-TIME:20260811T202222Z UID:indico-contribution-73-656@cern.ch DESCRIPTION:Speakers: Alexander Sorin (Joint Institute for Nuclear Researc h)\nWe address the issue of energy and charge dependence of global polariz ation of $\\Lambda$ hyperons in peripheral Au−Au collisions recently obs erved by the BES STAR collaboration at RHIC. We compare different contribu tions to the anomalous mechanism relating polarization to vorticity and hy drodynamic helicity in QCD matter. We stress that the suppression of the g ravitational anomaly contribution in strongly correlated matter observed i n lattice simulations confirms our earlier prediction of rapid decrease of polarization with increasing collision energy. Our mechanism leads to pol arization of anti-$\\Lambda$ of the same sign and larger magnitude than th e polarization of $\\Lambda$. Polarization calculated in the kinetic QGSM model has a maximum at the NICA and FAIR energy range. The energy and char ge dependence of polarization is suggested as a sensitive probe of fine de tails of QCD matter structure.\n\nhttps://indico.particle.mephi.ru/event/4 /contributions/656/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/656/ END:VEVENT BEGIN:VEVENT SUMMARY:$\\pi^0$-hadron correlations in pp\, p-Pb and Pb-Pb collisions at ALICE DTSTART;VALUE=DATE-TIME:20161013T132500Z DTEND;VALUE=DATE-TIME:20161013T134500Z DTSTAMP;VALUE=DATE-TIME:20260811T202222Z UID:indico-contribution-73-634@cern.ch DESCRIPTION:Speakers: Dmitry Blau (NRC "Kurchatov Institute")\nWe present the status of the analyses and latest results on $\\pi^0$-hadron correlati ons measured with ALICE experiment in pp and Pb-Pb collisions at $\\sqrt{s _{NN}}$ = 2.76 TeV and p-Pb collisions at $\\sqrt{s_{NN}}$ = 5.02 TeV. Two -particle correlations technique is a powerful tool to study collective mo tion effects and energy deposition of partons in quark-gluon matter formed in high-energy particles collisions. Measuring the hadron per-trigger yie ld with high $p_T$ trigger hadrons we observe the correlation of particles belonging to the same jet as the trigger hadron\, and those hadrons from the jet on the opposite side. A detailed study of di-hadron correlations w ith its centrality dependence in p-Pb and Pb-Pb collisions\, comparison to pp collisions at the same $\\sqrt s$ and model predictions could provide more insight to the nature of the jet modification in Quark Gluon Plasma ( QGP). Using identified particles as trigger is advantageous for determinat ion of constrains on theoretical models describing parton energy loss in t he quark-gluon medium.\n \nALICE experiment includes two electromagnetic c alorimeters\, PHOS and EMCAL\, which can measure and identify $\\pi^0$ mes ons in a wide $p_T$ range. Associated charged hadrons are measured with th e ALICE Central Tracking System. We present measured correlation functions and per trigger yields and compare them to the theoretical predictions.\n \nhttps://indico.particle.mephi.ru/event/4/contributions/634/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/634/ END:VEVENT BEGIN:VEVENT SUMMARY:Relativistic anisotropic stars with the polytropic equation of sta te in general relativity DTSTART;VALUE=DATE-TIME:20161013T142500Z DTEND;VALUE=DATE-TIME:20161013T144500Z DTSTAMP;VALUE=DATE-TIME:20260811T202222Z UID:indico-contribution-73-581@cern.ch DESCRIPTION:Speakers: Alexander Isayev (Kharkov Institute of Physics and T echnology)\nSpherically symmetric relativistic stars with the polytropic e quation of state\, which possess the local pressure anisotropy\, are consi dered in the context of general relativity. The generalized Lane-Emden equ ations are derived for the arbitrary anisotropy parameter. They are then a pplied to some special ansatz for the anisotropy parameter in the form of the differential relation between the anisotropy parameter and the metric function *ν*. The analytical solutions of the obtained equations are foun d for incompressible fluid stars and then used for getting their mass-radi us relation\, gravitational and binding energy. Also\, the equation for st udying the dynamical stability of incompressible fluid stars with respect to radial oscillations is obtained and analyzed.\n\nhttps://indico.particl e.mephi.ru/event/4/contributions/581/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/581/ END:VEVENT END:VCALENDAR