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Excited QCD 2015

8–14 Mar 2015
Tatranska Lomnica, Slovakia
Europe/Bratislava timezone

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Contribution List

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  1. 46. Opening of eQCD 2015 talks
    09/03/2015, 08:50
  2. 41. Holographic Scalar and Tensor Glueballs
    Denis Parganlija
    09/03/2015, 09:00
    Glueballs are expected to emerge in the non-perturbative region of QCD building an abundant spectrum with already established states (quarkonia) and those whose identification is still elusive (tetraquarks, molecular and exotic states and others). I present a top-down holographic approach, featuring one free parameter and an overall scale, that allows for calculation of mass spectra in the...
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  3. 2. The role of the kinematical constraint and non-linear effects in the CCFM equation
    Dr Michal Deak (IFIC/CSIC, Universitat de Valencia)
    09/03/2015, 09:30
    The importance of application of the kinematical constraint on the evolution of unintegrated parton density functions in the BFKL formalism was studied in recent publications. In this talk we focus on the role of the kinematical constraint in the CCFM equation and its non-linear extension. We compare numerical results obtained by solving the CCFM equation and argue that kinematical constraint...
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  4. 36. Ultra-relativistic light-heavy nuclear collisions and collectivity
    Wojciech Broniowski (IFJ PAN)
    09/03/2015, 10:30
    I will talk about collective aspects in theoretical description of ultra-relativistic p-A, d-A, and 3He-A (A is a heavy nucleus) collisions, where recent measurements have been carried out at RHIC and the LHC. I will also show predictions for 12C-A reactions, where the harmonic flow patterns are sensitive to the deformation of the 12C ground-state wave function, thus offering a new probe of...
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  5. 16. A new hydrodynamic model using an exact Riemann solver
    Zuzana Feckova
    09/03/2015, 11:00
    Hydrodynamic modeling of quark-gluon plasma requires sophisticated numerical schemes that have low numerical viscosity and are able to cope with high gradients of energy density that may appear in initial conditions. We propose to use the Godunov method with an exact Riemann solver for ideal hydrodynamic modeling to meet these conditions. We present the results of numerical tests of the...
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  6. 17. The latest STAR results on quarkonium production
    Dr Barbara Trzeciak (Czech Technical University in Prague)
    09/03/2015, 16:30
    The suppression of quarkonium production in high energy heavy-ion collisions relative to proton-proton collisions due to color screening was proposed as a signature of Quark-Gluon Plasma formation. Studies of quarkonium production in nuclear collisions can provide insight into the thermodynamic properties of the hot and dense medium created in relativistic heavy-ion collisions at RHIC....
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  7. 19. Unquenching the three-gluon vertex
    Adrian Lorenz Blum (University of Graz)
    09/03/2015, 17:00
    The Dyson-Schwinger equation for the three-gluon vertex in Landau gauge is solved without and with the quark triangle included. Hereby we concentrate on quarks in the chiral limit and discuss implications of our findings for the quark-gluon vertex.
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  8. 39. Hydrodynamics of QCD
    Pasi Huovinen (Johann Wolfgang Goethe-Universität)
    09/03/2015, 18:00
    In this talk I will review the use of hydrodynamics to model heavy-ion collisions at ultrarelativistic energies, and what such modeling has taught us about the properties of QCD matter.
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  9. 37. Chiral phase transition scenarios from the vector meson extended Polyakov quark meson model
    Peter Kovacs (Wigner RCP)
    09/03/2015, 18:30
    Chiral phase transition is investigated in a SU(3)_L x SU(3)_R symmetric vector meson extended linear sigma model with additional constituent quarks and Polyakov loops (extended Polyakov quark meson model). The parameterization of the Lagrangian is done at zero temperature in a hybrid approach, where the mesons are treated at tree-level, while the constituent quarks at 1-loop level....
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  10. 32. A Simple Model for the Glasma
    Larry McLerran (BNL)
    10/03/2015, 09:00
    I discuss a simple description of the distribution of quarks and gluons in the Glasma. This is motivated by transport equation for over occupied systems.
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  11. 18. The anomalous magnetic moment of the muon from lattice QCD
    bipasha chakraborty (urn:Google)
    10/03/2015, 09:30
    The anomalous magnetic moment of the muon, defined as the fractional difference of its gyromagnetic ratio from the naive value of 2, has been measured with an impressive accuracy of 0.54 parts per million in experiment (BNL E821), thus providing one of the most stringent tests of the Standard Model. Intriguingly, the experimentally measured anomaly disagrees by around 3 standard deviations...
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  12. 35. Universality of the hard-loop action
    Alina Czajka (Jan Kochanowski University)
    10/03/2015, 10:30
    The effective actions of gauge bosons, fermions and scalars, which are obtained within the hard-loop approximation, are shown to have unique forms for a whole class of gauge theories including QED, scalar QED, super QED, pure Yang-Mills, QCD, super Yang-Mills. The universality occurs irrespective of a field content of each theory and of variety of specific interactions. Consequently, the...
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  13. 22. Refined lattice/model investigation of u d $\bar b \bar b$ tetraquark candidates with heavy spin effects taken into account
    Jonas Benedict Scheunert (Goethe Universität Frankfurt)
    10/03/2015, 11:00
    We investigate four-quark systems consisting of two heavy anti-bottom quarks and two light up/down quarks. To this end we solve a coupled Schrödinger equation for the anti-bottom-anti-bottom separation using potentials computed via lattice QCD in the limit of static anti-bottom quarks. This coupled Schrödinger equation allows to incoporate effects due to the heavy anti-bottom spins.
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  14. 11. Scalar meson $f_0(500)$ from the analysis of pion scalar form factor and the correct S-wave isoscalar $\pi\pi$ phase shift data
    Prof. Stanislav Dubnicka (Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovak Republic)
    10/03/2015, 16:30
    In the recently elaborated fully solvable mathematical problem to be concerned of a finding of an explicit form of the pion scalar form factor the inaccurate experimental information in the elastic region on the S-wave isoscalar $\pi\pi$ phase shift, is replaced by the data with theoretical errors to be generated by the Garcia-Martin-Kaminski-Pela'ez-Yndurain Roy-like equations and as a...
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  15. 21. The $\pi\pi$ scattering amplitude and the $\sigma$ meson
    Petr Bydzovsky (Nuclear Physics Institute AS CR)
    10/03/2015, 17:00
    We constructed the multichannel $\pi\pi$ amplitudes in the S- and P-waves which satisfactorily describe the $\pi\pi$ scattering data [1]. In the construction we have utilized the uniformizing variable and formulas for analytical continuation of the S-matrix elements to all sheets of the Riemann surface but we did not fully include the constraint on the crossing symmetry which is...
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  16. 12. Recents results on charmonium-like states at BESIII
    Myroslav Kavatsyuk (KVI-CART, University of Groningen)
    10/03/2015, 18:00
    Despite the successes of the Standard Model, the QCD-based nature of the strong interaction is insufficiently understood. Charmonium spectroscopy is an ideal tool to provide insight into the non-perturbative dynamics of the strong force. It provides rigorous guidelines to various theoretical approaches, thereby, gaining insight into quark confinement and the formation of hadronic matter. The...
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  17. 14. Is the spacetime Euclidean inside the hadrons?
    Vladimir Sauli (Nuclear Institute Rez near Prague)
    10/03/2015, 18:30
    Solution of Schwinger-Dyson and Bethe-Salpeter Equations for excited and ground state pions will be presented. The quark gap equation has been solved directly in our Minkowski space-time and the solution, according to confinement, does not allow a free quark propagation. The Minkowski space solution for confining QCD as will be shown, is not only numerically accessible, but also ...
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  18. 26. Some new insights into confinement
    Thomas Cohen (University of Maryland)
    11/03/2015, 09:00
    This talk reviews some recent progress in making sense of confinement. The focus of the talk is on cousins of QCD, rather than QCD itself; these cousin theories have features lacking in QCD which facilitate the analysis. One critical feature of this sort is center symmetry, and the core of the talk is an exploration of the connection of center symmetry to confinement. One principal way to...
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  19. 24. Simulations at fixed topology: fixed topology versus ordinary finte volume corrections
    Arthur Dromard (Goethe University)
    11/03/2015, 09:30
    Lattice QCD simulations tend to become stuck in a single topological sector at fine lattice spacing, or when using chirally symmetric overlap quarks. In such cases computed observables differ from their full QCD counterparts by finite volume corrections, which need to be understood on a quantitative level. We discuss extensions of existing relations from the literature between correlation...
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  20. 29. Saturation and geometrical scaling: from DIS to HI
    Michal Praszalowicz (Jagellonian University, Krakow)
    11/03/2015, 10:30
    Saturation of gluon distribution is a consequence of non-linear evolution equations of QCD. Saturation implies the existence of so called saturation momentum which is gluon density per unit rapidity per transverse area. At large energies for certain kinematical domains saturation momentum is the only scale for physical processes. As a consequence different observables exhibit so called...
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  21. 27. Phase diagram of QCD with Complex Langevin simulations
    Benjamin Jäger (Swansea University)
    11/03/2015, 11:00
    Simulations with a finite chemical potential typically lead to a severe sign problem, prohibiting any standard Monte Carlo approach. For simulations of QCD we use the complex Langevin method, for which we apply adaptive step-sizes and gauge cooling to ensure the convergence. We present preliminary results for heavy quark QCD and explore the application for two dynamical quarks.
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  22. 34. Heavy ions at the LHC
    Andre Mischke (Utrecht University (NL))
    11/03/2015, 16:30
    Ultra-relativistic collisions of heavy ions allow studying strongly interacting matter at extreme energy densities and temperatures. Quantum-Chromodynamics predicts that at such conditions normal, hadronic matter turns into a plasma of deconfined quarks and gluons, which are the constituents of atomic nuclei. In cosmology, it is believed that matter in the early universe must have existed in...
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  23. 23. $\pi \eta$ photoproduction on the nucleon
    Dr Lukasz Bibrzycki (Pedagogical University of Cracow)
    11/03/2015, 17:00
    We present the Born amplitudes for the pi eta photoproduction on the nucleon. These amplitudes and the corresponding partial wave amplitudes are essential for the description of the photoproduction of isovector resonances with masses below 2 GeV. Some of these resonances, in particular $a_0(980)$ and $a_0(1450)$ are believed to have a substantial mollecular admixture. These mollecular states...
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  24. 38. Tetraquark bound states in a Bethe-Salpeter approach
    Gernot Eichmann
    11/03/2015, 18:00
    I will present results for tetraquark masses in the covariant Dyson-Schwinger/Bethe-Salpeter approach. We study two setups: in the first one, the system is simplified to a coupled diquark/antidiquark-meson/meson equation. In the second case we solve a genuine four-body equation where quarks interact via gluon exchange. In both cases we find a light scalar-isoscalar state in the ~500 MeV...
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  25. 15. Flow anisotropies due to momentum deposition from hard partons
    Boris Tomasik (Univerzita Mateja Bela (SK))
    11/03/2015, 18:30
    Anisotropies of transverse expansion flow in ultrarelativistic nuclear collisions are nowadays precisely measured and potentially carry important information about the transport properties of hot deconfined matter. In order to extract this information reliably from data analysis one must take into account other effects which can cause flow anisotropies. Hard partons, produced copiously at the...
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  26. 28. Quark properties from the Hadron Resonance Gas
    Enrique Ruiz Arriola (Universidad de Granada)
    12/03/2015, 09:00
    This work is based on our recent works 1) Quark Hadron Duality at Finite Temperature By E. Ruiz Arriola, L.L. Salcedo, E. Megias. arXiv:1410.3869 [hep-ph]. 10.5506/APhysPolB.45.2407. Acta Phys.Polon. B45 (2014) 2407. 2) Polyakov loop spectroscopy in the confined phase of gluodynamics and QCD By E. Megias, E. Ruiz Arriola, L.L. Salcedo. arXiv:1409.0773 [hep-ph]. 3) Polyakov loop...
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  27. 5. Dilepton production from the quark-gluon plasma using (3+1)-dimensional anisotropic dissipative hydrodynamics
    Dr Radoslaw Ryblewski (Institute of Nuclear Physics PAS)
    12/03/2015, 09:30
    We compute dilepton production from the deconfined phase of the quark-gluon plasma using leading-order (3+1)-dimensional anisotropic hydrodynamics. The anisotropic hydrodynamics equations employed describe the full spatiotemporal evolution of the transverse temperature, spheroidal momentum-space anisotropy parameter, and the associated three-dimensional collective flow of the matter. The...
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  28. 3. Towards a consistent description of in-medium parton branching
    Liliana Apolinario (Instituto Superior Técnico)
    12/03/2015, 10:30
    Ultra-relativistic heavy-ion collisions are a window of opportunity to study QCD matter under extreme conditions of temperature and density, such as the quark-gluon plasma. Among the several possibilities, the study of jet quenching - generic name given to in-medium energy loss modifications of the parton branching - is a powerful tool to assess the properties of this new state of matter. The...
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  29. 10. Latest results on anisotropy in pPb and PbPb collisions from CMS
    Jovan Milosevic (Vinca Institute of Nuclear Sciences (VINCA))
    12/03/2015, 11:00
    In this talk we present some of the heavy-ion results from CMS, restricting on anisotropic particle emission. Consistency between the results obtained using four-, six and eigth-particle correlation as well as the Lee-Yang zero method reveals a multi-particle nature of the long-range correlations observed in pPb collisions. By correlating an identified strange hadron ($K^{0}_{S}$ or...
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  30. 40. Non-ordinary meson couplings in the 1/Nc expansion
    Jose R. Pelaez (Universidad COmplutense)
    12/03/2015, 16:30
    We study the large Nc behavior of couplings among light meson states with different compositions in terms of quarks and gluons. We shortly review the most common compositions of mesons, which are of interest for the understanding of low-lying meson resonances, namely, the ordinary quark-antiquark states as well as the non-ordinary, glueball, tetraquark, etc. We dedicate special attention to...
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  31. 9. Deconfinement in dense (two-color) matter
    Tomas Brauner (Vienna University of Technology)
    12/03/2015, 17:00
    I will review our current understanding of the phase diagram of two-color quark matter with emphasis on the comparison of model and lattice results. Reproducing even *qualitatively* the thermodynamic observables measured on the lattice requires augmenting the standard Polyakov loop Nambu-Jona-Lasinio model with two new elements: renormalization of the Polyakov loop, and explicit chiral...
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  32. 33. Overview of the Run 1 Higgs Boson Physics Results at ATLAS
    Jelena Jovicevic (TRIUMF (CA))
    12/03/2015, 18:00
    TBA
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  33. 31. Latest developments in anisotropic hydrodynamics
    Leonardo Tinti (Jan Kochanowski University)
    12/03/2015, 18:30
    In ultrarelativistic heavy-ion collisions nuclear matter is heated to a temperature exceeding that necessary to create a quark-gluon plasma (QGP). Traditionally, second order viscous hydrodynamics has been used to reproduce the soft collective flow of the QGP and hadronic spectra; however, due to rapid longitudinal expansion in the early stages of evolution, the system may possess substantial...
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  34. 42. Search for the exotic matter at low energies
    Pawel Moskal (Jagiellonian University)
    13/03/2015, 09:00
    The talk will be divided into two parts. We will discuss (i) the search for the new kind of nuclear matter in the form of the mesic-nuclei, and (ii) the discovery of the di-baryon state with the WASA detector at COSY
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  35. 25. A short review of some double-parton scattering processes
    Antoni Szczurek (Institute of Nuclear Physics)
    13/03/2015, 09:30
    We review double parton scattering (DPS) effects in three selected reactions: production of $c \bar c \bar c$, production of jets with large rapidity distance and $W^+ W^-$ production. We present QCD leading-order predictions for energy dependence of $c \bar c \bar c$ production. The DPS cross section for $c \bar c c \bar c$ grows faster than that for $c \bar c$ production. This is...
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  36. 44. Probing QCD at HERA
    Oleksii Turkot (DESY)
    13/03/2015, 10:30
    Measurements of ep collisions at HERA which probe and constrain QCD are presented from the H1 and ZEUS Collaborations. The HERA combined measurements of the inclusive deep inelastic scattering cross sections provide the strongest constraint of the structure of the proton. High-precision jet cross sections are presented which allow a world-competitive measurement of the strong coupling...
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  37. 6. Dyson-Schwinger studies of Yang-Mills vertices at zero and non-vanishing temperatures
    Markus Huber (JLU Giessen)
    13/03/2015, 11:00
    Green functions are useful quantities whose applications in quantum chromodynamics range from bound state calculations to investigations of the phase diagram. Obtaining them from functional equations faces the challenge of devising a proper truncation scheme. I will report on recent progress to determine the correlation functions of pure QCD in the vacuum and at non-zero temperature from...
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  38. 7. Perspectives of charmonium spectroscopy at PANDA
    Anastasia Karavdina (University Mainz)
    13/03/2015, 16:30
    The new Facility for Antiproton and Ion Research (FAIR) is under construction at GSI in Darmstadt (Germany). The PANDA experiment is one of the major projects in preparation at the FAIR. In this experiment an antiproton beam in the momentum range from 1.5 to 15 GeV/c will be exploited to address a wide range of topics in Hadron Spectroscopy, Nucleon Structure, Hadrons in Matter and Hypernuclei...
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  39. 30. Hadron Spectroscopy with CLAS and CLAS12
    Dr Derek Glazier (University of Glasgow)
    13/03/2015, 17:00
    Investigating the spectrum of hadrons provides many interesting topics and helps to validate QCD as the underlying mechanism behind the strong interaction. In recent years photoproduction data has added to the wealth of data that can be used to determine the existance and properties of hadronic states. The real photon beam in Hall B at Jefferson Lab is providing particulalry rich data due...
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  40. 1. A QCD Vacuum of Center Vortices
    Manfried Faber (Vienna University of Technology)
    13/03/2015, 18:00
    We present evidence why center vortices are a complete model of quark confinement and how they break chiral symmetry, thus unifying these non-perturbative phenomena of the QCD vacuum in a common framework.
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  41. 20. Effects of scalar mesons in a skyrmion model with the hidden local symmetry
    Mr Bing-Ran He (Nagoya Univ.)
    13/03/2015, 18:30
    We construct a skyrmion model including a two-quark and a four-quark scalar mesons as well as the pion, rho and omega mesons within a framework of the hidden local symmetry. We investigate the effects of scalar mesons in the model, we show that the scalar mesons reduce the skyrmion mass.
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  42. 43. Status of FAIR
    Dr Diana Nicmorus (Facility for Antiproton and Ion Research)
    13/03/2015, 19:00
    The new international accelerator facility FAIR under construction in Darmstadt aims at studying matter at atomic, nuclear, and hadronic levels. I will review different aspects of the current status of the Facility for Antiproton and Ion Research. I will present the focus of the experimental programmes at FAIR, with highlight on open questions addressed by developments in hadron physics,...
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  43. 47. Closing of eQCD 2015 talks
    13/03/2015, 19:30