Recent results on flow and correlations from the ATLAS experiment

• Adam Trzupek (Institute of Nuclear Physics Polish Academy of Sciences (PL))

TBA

Higher flow harmonics and cross-talk of elliptic and triangular flows

• Evgeny Zabrodin (University of Oslo (NO))

Generation of higher flow harmonics in the HYDJET++ model is studied for lead-lead collisions at sqrt{s} = 2.76 ATeV. The model enables one to investigate the role of several processes, such as the interplay of hydrodynamics and jets, and the final state interactions. Comparison with the experimental data shows that the cross-talk of elliptic $v_2$ and triangular $v_3$ flows in the model reproduces qualitatively and, sometimes, quantitatively the basic trends observed for quadrangular v_4, pentagonal v_5 and hexagonal v_6 flows.

When Worlds Collide

• Agnes Mocsy (Pratt Institute)

TBA

Open heavy flavor in STAR

• Jaroslav Bielcik (Czech Technical University (CZ))

In relativistic heavy ion collisions at RHIC, heavy quarks are expected to be created from initial hard scatterings. The interaction between heavy quarks and the medium is sensitive to the early medium dynamics, therefore heavy quarks are suggested as an ideal probe to quantify the properties of the strongly interacting QCD matter. In this talk, we report on recent STAR results of open heavy flavor production at $\sqrt{s_{NN}}$ =39, 62.4, 193, 200 and 500 GeV in p+p, Au+Au and U+U collisions. We present nuclear modification factor and elliptic flow of open charm mesons and non-photonic electrons.

Heavy-flavour results from the CERN-LHC

• Andre Mischke (Utrecht University (NL))

Heavy quarks (charm and beauty) are sensitive and penetrating probes to study the dynamical properties of the Quark-Gluon Plasma (QGP). This state of matter can be recreated, at sufficiently high temperatures or energy densities, and carefully studied in the laboratory in high-energy heavy-ion collisions. Due to their large mass, heavy quarks are produced predominantly in the (hottest) initial phase of the collision via gluon fusion processes and therefore allow to explore the complete space-time evolution of the QGP matter. Theoretical models based on perturbative QCD predict that heavy quarks should experience smaller energy loss than light quarks, when propagating through the QGP matter, due to the mass-dependent suppression of gluon radiation at small angles (the so-called dead-cone effect). Of particular interest is the quantitative understanding of fundamental quantities such as the transport coefficients. In this talk selected highlights on open heavy-flavour production in lead-lead collisions at CERN's Large Hadron Collider will be presented and discussed.

Chiral thermodynamics with charm

• Chihiro Sasaki (FIAS)

Chiral thermodynamics of charmed mesons is formulated at finite temperature within a $2+1+1$-flavored effective Lagrangian incorporating heavy quark symmetry. The charmed-meson mean fields act as an extra source which breaks the chiral symmetry explicitly. This leads to effective interactions of the light and heavy-light mesons, which depend on temperature. Effective masses of the scalar and pseudoscalar charmed-mesons tend to approach each other as increasing temperature, so that the splitting between the chiral partners is reduced. These chiral splittings turn out to be less sensitive to the light-quark flavors, attributed to the underlying heavy quark symmetry. Consequently, chiral symmetry restoration is more accelerated in the strange charmed-mesons than in the strange light mesons.

Universality of hard-loop action

• Alina Czajka (Jan Kochanowski University)

The effective action obtained within the hard loop approximation determines, in particular, a spectrum of collective excitations which is a fundamental characteristics of any many-body system. We show that the actions of gauge bosons, fermions and scalars are of unique forms for a whole class of a gauge theories such as QED, scalar QED, SUSY QED, QCD, super Yang-Mills, irrespective of a field content and some specific interactions. Consequently, long-wave or semiclassical features of plasma systems governed by these theories such as collective excitations are almost identical. An origin of the universality is discussed.

Gluon Collective Modes in Anisotropic Quark-Gluon Plasma

• Stanislaw Mrowczynski (Jan Kochanowski University)

Gluon collective modes of quark-gluon plasma are systematically studied. The momentum distribution of plasma constituents is obtained from the isotropic one by stretching it or squeezing in one direction, which leads to a prolate or oblate distribution, respectively. There are considered all possible degrees of one dimensional deformation from the extremely prolate case, when the momentum distribution is infinitely elongated in one direction, to the extremely oblate distribution, which is infinitely squeezed in the same direction. For each case, the complete mode spectrum is given analytically if possible, and numerically when not. The number of modes is found by means of a Nyquist analysis. Unstable modes are shown to exist in all cases except that of isotropic plasma. The conditions for the existence of these instabilities are derived. The stable modes, which are not limited to small domains of wave vectors and therefore have an important influence on the system's dynamics, are also discussed.

FAIR for Extreme State of Matter Physics

• Boris Sharkov (FAIR GmbH)

****FAIR for Extreme State of Matter Physics**** Boris Sharkov FAIR GmbH, Planckstr.1, 64291 Darmstadt, Germany; NRNU MEPhI Moscow, Russia The Facility for Antiproton and Ion Research in Europe, FAIR, will provide worldwide unique accelerator and experimental detectors allowing for a large variety of unprecedented fore-front research in extreme state of matter physics and applied science. This presentation outlines the results of ongoing experimental activities on heavy ion accelerator facilities, providing intense beams capable of generating extreme state of matter by isochoric energy deposition regime. Considerations are focused on new experiments by using large synchrotron rings which appear to be efficient tools for investigations into the physics of high-brightness beams generation and high energy density research. Development of new plasma diagnostic methods for high resolution measurements of dense, non-ideal plasmas parameters is discussed. Reference: www.fair-center.eu

High Energy Density Physics related to Inertial Fusion with Intense Ion- and laser Beams at GSI and FAIR in Darmstadt

• Dieter H. H. Hoffmann (Technical University Darmstadt)

High Energy Density (HED) states in matter can be achieved by pulsed power deposition from intense laser or particle beams. GSI-Darmstadt presently provides the most intense heavy ion beam and a high power laser (PHELIX) for interaction experiments of laser plasma and ion beams. Approximately 200 scientists from 45 institutes and 16 countries worldwide are members of the HEDgeHOB [1] collaboration. They prepare novel experiments at FAIR (Facility for Antiproton and Ion Research) to study thermophysical, transport, and radiation properties of HED matter, generated by the impact of intense heavy ion- and laser beams on dense targets. Thus intense heavy ion beams open a new pathway to address the regime of Warm Dense Matter (WDM) with precision experiments. Warm dense matter is characterized by high density and relatively low temperature. This is a state that matter will pass through during the heating process of an inertial fusion target. Properties of matter in this regime are widely unknown. However the final state that will be reached during the heating process may well be determined by material properties of the dense strongly coupled plasma regime. A novel diagnostic system (PRIOR) using high energy protons has been implemented at GSI and is currently undergoing first tests. Progress in high energy density physics is closely related to the potential to produce targets that are specifically designed for beam plasma experiments. Here considerable progress has been achieved in producing micrometer-thick cryogenic foil-like targets from pure hydrogen. Intense ion beams also pose specific accelerator related problems, which we do address. These are related to the diagnostic of very intense ion beams and problems related to vacuum loss due to desorption processes. Moreover irradiation and activation of components does also influence material properties such as strain resistance, and electrical and thermal conductivity. We will report on the current status of the FAIR and efforts of the HEDgeHOB collaboration to prepare for the experimental phase at FAIR in a few years. Acknowledgement: This research was supported by BMBF research grants: 05P12RDFN6; 05P12RDB7; 05P12RDBK; 05P12RDRBN and 05K10RD1. References [1] HEDgeHOB Collaboration: http://hedgehob.physik.tu-darmstadt.de:

Role of angular momentum in relativistic heavy ion collisions

• Volodymyr Magas (University of Barcelona)

The latest experimental data from ALICE@LHC confirm that the hydrodynamical simulations of the ultra-relativistic heavy ion collisions are very successful in describing these reactions. One of the most important elements of such a hydrodymamical model is the initial state for further hydro evolution. Unfortunately at the moment there is no unambiguous model describing initial states of the energetic heavy ion collisions. I my talk I will argue that from the very general principles, like linear and angular momentum conservation, we can expect to form tilted and rotating initial state. I will present initial states generated by the Effective String Rope model [1] for RHIC and LHC heavy ion reactions; and compare it with some other models which intent to simulate/calculate initial state for hydrodynamical simulation, including for example CGC based model [2]. The key question of the talk is what are the observable consequences of such a tilted and rotating initial state? [1] Magas, Csernai, Strottman, Phys. Rev. C 64 (2001) 014901; Nucl. Phys. A712 (2002) 167. [2] Fries, Chen, arXiv:1407.1903 [nucl-th].

Identifying longitudinal rapidity fluctuations and directed flow measurements

• Gyulnara Eyyubova (Czech Technical University (CZ))

In heavy ion collisions, fluctuations of energy density in the initial state are essential both in transverse and in longitudinal direction. We present a method to estimate the Event-by-Event (EbE) center of mass rapidity fluctuations with the help of spectators (using ZDC detectors). This enables us to separate fluctuating and the global symmetry components in the flow, which is important for the odd flow harmonics, especially for v_1 and v_3.

Directed flow and freeze-out of hadrons in heavy-ion collisions in the energy range of BES (RHIC)

• Larisa Bravina (University of Oslo (NO))

The centrality, rapidity and transverse momentum dependences of directed flow in light and heavy systems of colliding nuclei are studied within microscopic transport model QGSM at energies from 10 AGeV to 160 AGeV. The directed flow of pions and kaons has negative slope at midrapidity irrespective of bombarding energy and mass number of the colliding ions. In contrast, directed flow of nucleons changes its slope from normal to antiflow in the midrapidity range in (semi)peripheral collisions at energies around 11.6 AGeV and higher. The origin of the flow disappearance is linked to nuclear screening. Since the effect is stronger for a light system, it can be distinguished from the similar phenomenon caused by the quark-gluon plasma formation. Directed flow of high-p_T hadrons has normal slope. To explain it one has to consider the freeze-out conditions of hadrons in microscopic model.

Flow vorticity in Peripheral heavy ion collisions

• Dujuan Wang (University of Bergen)

The vorticity development is studied in the reaction plane of peripheral relativistic heavy ion reactions, at high energies as well as the energies just above the threshold of transition to QGP. We use an initial state which can generate substantial angular momentum as our hydro input. The earlier predicted rotation effect and KHI can lead to significant initial vorticity and circulation. In low viscosity QGP this vorticity remains still significant at the time of freeze out of the system, although it is damped by to the explosive expansion. The dissipation also decreases the vorticity and circulation. In the reaction plane the vorticity arises from the initial angular momentum, and it is stronger than in the transverse plane where vorticity is caused by random fluctuations only.

Differential HBT and correlation functions for the exact hydro model.

• Sindre Velle (University of Bergen)

We will briefly look at the fundamentals of Hanbury Brown and Twiss (HBT) effect and how the Differential HBT method can be used to detect rotation. Previously we introduced this method for simple models and applied the method to the particle-in-cell relativistic (PICR) fluid dynamics model. Some of these results will be presented and we will then look at the correlation functions and the Differential HBT for a simple exact hydro model with rotation. In the exact hydro model the rotation and expansion of a fluid dynamical model is studied and by applying the Differential HBT to the exact model results we can see that the correlation function is sensitive to rotation.

Examination of the directed flow excitation function in heavy-ion collisions

• Volodymyr Konchakovski (Institute for Theoretical Physics, Giessen University)

Recent STAR data for the directed flow v1 obtained within the beam energy scan (BES) program has been analyzed within the Parton-Hadron-String-Dynamics (PHSD) transport model and a 3-Fluid Hydrodynamics (3FD) approach. The kinetic PHSD approach has been used to clarify the role of partonic degrees of freedom. The PHSD results, simulating a partonic phase and its coexistence with a hadronic one, are roughly consistent with data. The hydrodynamic results are obtained for two equations of state (EoS), a pure hadronic EoS and an EoS with a crossover type transition. The latter case is favored by the STAR experimental data. Special attention is paid to the description of antiproton directed flow based on the balance of p-pbar annihilation and the inverse processes for p-pbar pair creation from multi-meson interactions. Generally, the semiqualitative agreement between the measured data and the model results supports the idea of a crossover type of quark-hadron transition that softens the nuclear EoS but shows no indication of a first-order phase transition.

Variational Approach and Coarse Graining in Hydrodynamics

• Takeshi Kodama (Universidade Federal do Rio de Janeiro)

We discuss the variational approach to the hydrodynamics, including the viscous effects. We also point out that the role of coarse-graining procedure and the measure of local thermal equilibrium required in the hydrodynamic approach. In this formalism, possible quantum effects can also be treated.

Evaluating the collective properties of heavy-ion collisions from microscopic dynamics using the PHSD model

• Rafael Derradi de Souza (Universidade Federal do Rio de Janeiro)

The hydrodynamic modeling of the system evolution in relativistic heavy-ion collisions has been very successful in describing the collective behavior observed experimentally. However, the matter created in such collisions is small in space scale and contains large fluctuation. Therefore the theoretical justification for the application of hydrodynamic approach is still an open question. In this work, we investigate how the hydrodynamic behaviors can appear in heavy-ion collisions using a microscopic model which is constructed without assuming hydrodynamics. The PHSD (Parton-Hadron-String Dynamics) is suitable for this purpose since it someway accounts for multiparticle effects through the mean field. From the behavior of the energy-momentum tensor in a local rest frame, we discuss the degree of the local thermal equilibrium in this model.

Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions

• Etele Molnar (Hungarian Academy of Sciences)

We explore the influence of a temperature-dependent shear viscosity over entropy density ratio eta/s on the azimuthal anisotropies v2 and v4 of hadrons at various rapidities. We find that in Au+Au collisions at full RHIC energy, the flow anisotropies are dominated by hadronic viscosity at all rapidities, whereas in Pb+Pb collisions at the LHC energy, the flow coefficients are affected by the viscosity both in the plasma and hadronic phases at midrapidity, but the further away from midrapidity, the more dominant the hadronic viscosity is. The centrality and rapidity dependence of the elliptic and quadrangular flows can help to distinguish different parametrizations of (etas/s)(T), while at midrapidity the flow harmonics are almost independent of the decoupling criterion, but show some sensitivity to the criterion at back- and forward rapidities.

Multiple diffaction theory of elastic pp scattering at LHC

• Tamas Csorgo (Hungarian Academy of Sciences (HU))

TBA

Particle correlations and collectivity in heavy-ion collisions at CMS

• Wei Li (Rice University (US))

TBA

The smallest drops of QGP and sounds of the Little and Big Bang

• Edward Shuryak (stony brook university)

The talk covers three subjects. The first is an update on collective explosion in high multiplicity pA and pp collisions. We focus on what the radial flow, more violent than cases observed before, and HBT data tell us about the sizes of those fireballs. The second is a reminder of analytic theory of small hydro perturbations of the hydro evolution, created by fluctuations of the initial conditions. Simple description of acoustic damping of fluctuating angular harmonics describe the data and give insights into simple geometry of the sound circles. The third deals with QCD and electroweak phase transitions in Big Bang: its new element is production of large wavelength sounds, which subsequently produce gravity waves. We end discussing their potential observability.

Observables and initial conditions for a three dimensionally expanding, rotating exact solution of hydrodynamics

• Tamas Csorgo (Hungarian Academy of Sciences (HU))

I plan to present a recently found family of exact and rotating solutions of non-relativistic hydrodynamics [1] and evaluate the observables (single particle spectra, elliptic flow, Bose-Einstein correlations or HBT radii) from the model, and study their dependence of the initial conditions and on the equations of state. If time permits I will also briefly review what is known about exact and analytic solutions of hydrodynamics both in the relativistic and in the non-relativistic kinematic domain and where are the white, not yet explored territories on this map of exact solutions. I will also present a family of exact solutions of 3 dimensionally expanding, ellipsoidally symmetric solutions of the equations of viscous hydrodynamics. This talk will be dedicated to the birthday of Laszlo P. Csernai. References: [1] T. Csörgő and M. I. Nagy, Phys.Rev. C89 (2014) 044901 [2] L.P. Csernai, D.J. Wang and T. Csörgő. Phys. Rev. C 2014 in press [3] T. Csörgő, M. I. Nagy and I. Barna, in preparation [4] T. Csörgő, in preparation

Initial-state fluctuations and factorization breaking in pPb and PbPb collisions at LHC energies

• Jovan Milosevic (University of Belgrade (RS))

The single-particle anisotropy coefficients measured in PbPb collisions at $\sqrt{s_{NN}}$=2.76~TeV and high-multiplicity pPb collisions at $\sqrt{s_{NN}}$=5.02~TeV by the CMS collaboration are presented. These coefficients are obtained from two-particle $\Delta\phi$-$\Delta\eta$ correlations. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The breakdown of factorization of two-particle correlations into single-particle azimuthal anisotropies is observed in both colliding systems. This effect, recently predicted by hydrodynamics, is induced due to initial-state fluctuations which could produce a transverse momentum dependence of event-plane angle even if hydrodynamic flow is the only source of correlations.

Anisotropic flow generated by hard patrons in medium

• Boris Tomasik (Univerzita Mateja Bela (SK))

Jets and mini jets are produced copiously in nuclear collisions at the LHC. Large part of their momentum and energy is deposited into the hot deconfined medium. Within hydrodynamic simulation with included jets we investigate how the deposited energy influences collective expansion of the fireball and particularly the flow anisotropies. The contribution is significant and thus must be accounted for in the simulations if they are to be used for the extraction of transport properties of hot QCD matter. We show how the model is formulated and the size of anisotropies generated by jets.

HIP at CCNU

• Xu Cai (Central China Normal University CCNU (CN))

TBA

The long-wavelength limit of the Boltzmann equation: deriving dissipative relativistic fluid dynamics from a microscopic theory

• Dirk Rischke (University Frankfurt)

Dissipative relativistic fluid dynamics is derived from the Boltzmann equation via the method of moments. In contrast to previous derivations, the single-particle distribution function is not subjected to a truncation in an uncontrolled way. Instead, it is expanded in terms of irreducible tensors in momentum-space and orthogonal polynomials in energy. The infinite system of moment equations, which is equivalent to the Boltzmann equation, can then be truncated in a controlled way by considering only the slowest microscopic time scale and a rigorous power-counting in Knudsen and inverse Reynolds numbers. It is demonstrated that agreement with microscopic solutions of the Boltzmann equation for specific test problems can be improved by going beyond the traditional 14-moment approximation.

Studying the QGP in ultrarelativistic heavy-ion collisions

• Carsten Greiner (University of Frankfurt)

An updated version of the partonic transport model Boltzmann Approach to MultiParton Scatterings (BAMPS) is presented, which allows interactions among all partons: gluons, light quarks, and heavy quarks with elastic and inelastic collisions. We introduce the improved Gunion-Bertsch matrix element, which cures problems of the original Gunion-Bertsch result in characteristic regions of the phase space. Verified by extensive numerical calculations, the improved matrix element agrees well with the exact calculation. With the new matrix element, important properties of the quark-gluon-plasma in heavy-ion collisions such as the thermalization time of the plasma and the shear viscosity over entropy density ratio are calculated within the microscopic transport model BAMPS. Furthermore, we compare our results of the nuclear modification factor and elliptic flow to experimental data at RHIC and LHC.

Event fluctuation of charged particle eccentricity and elliptic flow in Pb-Pb collisions at √s =2.76 TeV

• Gang Chen (China University of Geoscience,Wuhan 430074, China.)

We employed the new issue of a parton and hadron cascade model PACIAE 2.1 to systematically investigate the charged particle elliptic flow parameter v2 and eccentricity ε2 in the relativistic Pb-Pb collisions at 2.76 TeV. With randomly sampling the transverse momentum x and y components of the particles generated in string fragmentation on the circumference of an ellipse instead of circle originally in PACIAE 2.0, the calculated charged particle probability density distribution of v2 and ε2 as well as their relative fluctuations reproduce the corresponding ATLAS data well.

The charged hadron multiplicity in e^-+p and e^-+D SIDIS in PYTHIA and PACIAE models

• BEN-HAO SA (China Institute of Atomic Energy)

Abstract is to be added later.

Newest Developments in Cluster Radioactivity

• Dorin N. Poenaru (IFIN-HH (Horia Hulubei National Institute for Physics and Nuclear Engineering))

The analytical superasymmetric fission (ASAF) model was successfully employed to make a systematic search and to predict, with other models, cluster radioactivity [1,2]. The experiments confirmed the half-lives and the crucial importance of shell effects for parent nuclei with atomic numbers Z=87-96 and established a rare phenomenon in a strong background of alpha particles. After a brief historical report we present the macroscopic-microscopic method with an example of PES for 282Cn. Then we describe our theoretical approach of alpha decay (ASAF, UNIV, and semFIS models), cluster decay (ASAF and UNIV), and spontaneous fission dynamics with cranking inertia. UNIV means the universal curve, and semFIS the fission based semi-empirical formula. The latest evaluation of the experimental atomic masses [3] are very useful to update the Q-values. Within ASAF, UNIV, and semFIS models the deviations for 512 (88 %), 527 (91 %), and 555 (96 %) alpha emitters out of the total of 580, are under one order of magnitude. Similarly, ASAF and UNIV may reproduce 23 (85 %), and 24 (89 %) experimental data from the total of 27 cluster emissions with deviations under one order of magnitude. All measured half-lives [4] on 14C, 20O, 23F, 22,24-26Ne, 28,30Mg, 32,34Si radioactivities are in agreement with predicted values within ASAF model. The daughter is mainly the doubly magic 208Pb. Calculations of half-lives of superheavy nuclei (SH) show an unexpected result [5]: for some of them cluster radioactivity (CR) dominates over alpha decay --- the main decay mode of the majority of recently discovered SHs. We changed the concept of CR in order to allow emitted particles with Ze > 28 from parents with Z > 110 and daughters around 208Pb. From a typical example the trend of increasing branching ratio Ba for heavier nuclei may be clearly seen. Ba = Ta/Tc. *This work is supported within IDEI Programme under contracts 43/05.10.2011 and 42/05.10.2011 with UEFISCDI, Bucharest.* **References** [1] http://www.britannica.com/EBchecked/\\topic/465998/. [2] D.N. Poenaru, W. Greiner, in Nuclear Decay Modes (IOP Bristol, 1996). [3] M. Wang, G. Audi et al., Chinese Physics, C 36 (2012) 1603. [4] R. Bonetti, A. Guglielmetti, Rom. Rep. Phys. 59 (2007) 301. [5] D.N. Poenaru, R.A. Gherghescu, W. Greiner, Phys. Rev. Lett. 107 (2011) 062503.

Heavy Quarks dynamics: is the charm really heavy in the QGP?

• Vincenzo Greco (University of Catania)

TBA

Heavy ion highlights at RHIC

• Sonja Kabana (Laboratoire de Physique Subatomique et des Technologies Associe)

We discuss recent results on collective phenomena and correlations, as well as hard probes at RHIC.

Open Questions in Hybrid Models for Heavy Ion Collisions

• Marcus Bleicher (Uni Frankfurt)

TBA

Measures of collective flow from azimuthal correlations in relativistic heavy ion collisions

• Chunbin Yang (CCNU)

TBA

There are no black holes: Pseudo-Complex General Relativity

• Walter Greiner (Frankfurt Institute for Advanced Studies (FIAS))

General Relativity- in particular if applied to the central mass problem – contains a singularity: The Schwarzschild singularity, which leads to the prediction of black holes. Our new concept is: No theory should contain black holes. This will also be applied to quantum electrodynamics: In General Relativity (G.R.) it leads us to Pseudo-Complex General Relativity. Black holes disappear and a new “Weltbild” for the cosmos emerges. Also “dark energy” does not exist. It appears as a consequence of missing terms in Einstein’s G.R.