## Nuclear and Quark Matter Seminar 2017 |

Dates:

16.02 |
15.03 |
26.04 |
24.05 |
21.06 |
23.08 |
06.09 |
13.09 |
25.10 |
22.11 |
13.12

Previous years: 2016 | 2015 | 2014 | 2013

Special EMMI Lectures:

- 8 June 2017, 11:15 and 13:30 - EMMI/KBW Lecture Hall (1.17)

Relativistic Hydrodynamics in Heavy-Ion Collisions

Wojciech Florkowski - Institute of Nuclear Physics, Polish Academy of Science, Krakow

Abstract

The lectures start with an introduction of the standard model of heavy-ion collisions based on the use of relativistic viscous hydrodynamics combined with modeling of the early stage and freeze-out. The phenomena of thermalization and hydrodynamization are discussed in the context of various theoretical approaches, including AdS/CFT. Then, various formulations of viscous hydrodynamics (starting from the Navier-Stokes version and ending on several very recently constructed versions) are presented and compared to each other. Finally, the possibility of including spin dynamics in the hydrodynamical equations and the general applicability range of hydrodynamics are discussed.

Lecture 1 | Lecture 2 - 22 June 2017, 13:30 - EMMI/KBW Lecture Hall Seitenraum (1.17)

Studies of Hadron Production in Nuclear Medium by LHCb

Valery Pugach - Institute for Nuclear Research, Kiev

Abstract

The LHCb forward spectrometer, designed for CP violation studies, has also become a perfect tool for measuring properties of hadron production in nuclear medium. Recent results will be presented for nucleus-nucleus interactions in colliding mode (the NN cms energy of 5 and 8 TeV) as well as in a fixed target mode (cms energy about 100 GeV). Events distribution over the transverse momentum (0.15< pT <6 GeV/c ) and rapidity (-5< y<-2.5 and 1.5< y<4) as well as corresponding nuclear modification factors are discussed in terms of some theoretical approaches.

Slides and LHCb paper (arXiv:1706.07122)

### EMMI NQM Seminars:

- 16 February 2017, 11:00 - EMMI/KBW Lecture Hall (1.17)

Summary of Quark Matter

Peter Senger & Amaresh Jaiswal - GSI Darmstadt

Abstract

Experimental and theoretical summaries of Quark Matter 2017 ...see its timetable

Slides: | Theory

- 15 March 2017, 13:30 - EMMI/KBW Lecture Hall (1.17)

Angular correlations as an experimental tool to probe hadron collisions

Malgorzata Janik - Warszaw University of Technology

Abstract

Two-particle angular correlations are a robust tool which allows the exploration of the underlying physics phenomena of particle production in collisions of both protons and heavy ions by studying the distributions of angles in Delta(eta)-Delta(phi) space (where Delta(eta) is the pseudorapidity difference and Delta(phi) is the azimuthal angle difference between two particles). These correlations open up the possibility to study a number of mechanisms simultaneously. Many phenomena, including mini-jets, elliptic flow, Bose-Einstein correlations, resonance decays, conservation laws, are sources of correlations. Each one produces a characteristic distribution in Delta(eta)-Delta(phi) space and contributes to the final shape of the correlation function. In this talk I will present an overview of two-particle angular correlation measurements and their interpretation from pp, pA and AA collisions, including latest results from LHC experiments.

Slides

- 26 April 2017, 13:30 - EMMI/KBW Lecture Hall (1.17)

Controversial Phenomena in Collider Data and the Five Sigma Criterion in high-energy physics

Tommaso Dorigo - INFN Padova

Abstract

Extraordinary claims require extraordinary evidence. The p < 0.000029% criterion used in high-energy and astroparticle physics does not appear adequate to cover all experimental situations. The seminar will start with a short history of anomalies found in HEP data and their resolution, and then focus on the statistical problem of defining a proper discovery level for new phenomena and on the non-trivial issues it entails.

Slides: pptx | pdf

...and follow-up, see Tommaso's GSI blog entry

- 24 May 2017, 13:30 - Main Auditorium/Hörsaal, SB

Hadrons interaction and consequences for neutron stars

Laura Fabbietti - TU München

Abstract

Many physicists would like to know what is inside neutron stars (NS). Others would be already very happy if they could understand how two and three baryons interact with better accuracy than available today. The two things are intertwined since the two and three body hadron interaction determines the equation of state, hence how pressure and energy depend on density, for every hadron system. Different hypotheses can be made about the content of NS. The scenarios vary from pure dense neutron matter, to mixtures of neutrons and strange hadrons up to quark matter. Each hypothesis, provided that the interaction among the constituents is well known, leads to an equation of state and to a precise mass to radius relationship for the NS. This way, observations of masses and radii for NS can test different hypotheses. A new method is proposed to exploit particle production at accelerator experiments to substitute scattering experiments among different hadron species. This idea can also open up the possibility of studying three body interactions among hadrons. First results from the HADES and ALICE collaborations, two experiments at very different beam energies, will be shown and the potential of the method will be discussed.

slides

- 21 June 2017, 13:30 - EMMI/KBW Lecture Hall (1.17)

Shallow bound states and universality

Hans-Werner Hammer - TU Darmstadt

Abstract

Particles with strong interactions have universal low-energy properties independent of the details of the short-distance dynamics. Such systems occur in many areas of physics, including ultracold atoms, hadrons, and nuclei. In the unitary limit of infinite scattering length, the interactions do not provide a length scale. Thus the effective field theory describing such a system is invariant under scale and conformal transformations. I will review some applications to systems near the unitary limit and discuss possible future applications to the production of weakly-bound nuclei in heavy ion collisions.

slides ...and review, arXiv:1702.08605

- 23 August 2017, 13:30 - EMMI/KBW Lecture Hall (1.17)

The beauty of heavy ion collisions

Giuseppe Bruno - INFN and Politecnico di Bari and CERN

Abstract

Heavy-ion collisions at ultra-relativistic energies are aimed at exploring the structure of nuclear matter at high temperatures and energy densities. Under these conditions, according to quantum chromodynamics (QCD) calculations on the lattice, the confinement of quarks and gluons inside hadrons is no longer effective and a phase transition to a quark-gluon plasma (QGP) occurs. Bottom-flavoured hadrons are effective probes of the conditions of the medium formed in such collisions. In fact, the b-bbar pair that will eventually hadronize into the observed beauty hadrons, is produced at the initial stage of the collision in high-virtuality scattering processes. The beauty quarks will therefore traverse the medium that is created in the collisions, interacting with its constituent, and thus experiencing its full evolution. For a correct interpretation of the heavy ion collisions results, reference measurements in more elementary pp and p-Pb collisions are indispensable. A review of the experimental results will be presented with comparison to theoretical model predictions along with an outlook for future measurements at the LHC.

slides

- 6 September 2017, 13:30 - EMMI/KBW Auditorium (1.17)

Finding the QCD critical point

Vladimir Skokov - RIKEN-BNL Research Center, Brookhaven

Abstract

The discovery of a critical point of Quantum Chromodynamics would represent one of the highlights of the nuclear physics community effort to map the QCD phase diagram and provide a lasting legacy for the field. The unique identification of this prominent landmark in the QCD phase diagram is, however, quite challenging. In this talk, I will discuss various phases of QCD, possibilities of probing them in experiments with heavy-ions and associated difficulties. In particular, I will concentrate on the particle number fluctuations and review recent theoretical findings and experimental data. I will also explore the influence of finite volume effects on baryon number fluctuations in a chiral model. When the volume is sufficiently small the system has two apparent critical points; as the system size decreases, the location of the apparent critical point can move to higher temperature and lower chemical potential. If time permits, I will discuss the implications for spatially inhomogenous phases, and a associated Lifshitz point, in the phase diagram of QCD.

slides

- 13 September 2017, 13:30 - EMMI/KBW Seitenraum (1.17)

Jet fragmentation: without and within a medium

Boris Kopeliovich - University of Valparaiso and MPI Heidelberg

Abstract

Regeneration of the color field, shaken off by a highly virtual parton, leads to its fragmentation into hadrons. The space-time development of fragmentation is particularly important if it happens within a medium. Mechanisms of medium suppressed fragmentation of light and heavy quarks turn out to be very different. The specific mechanisms of fragmentation of gluons and c-quarks into J/psi are considered as well.

slides

- 25 October 2017, 13:30 - EMMI/KBW Seitenraum (1.17)

Diffraction, ultra-peripheral collisions, low x physics at the LHC and connections with physics at the future EIC

Peter Braun-Munzinger - EMMI GSI and University of Heidelberg

Abstract

We will discuss physics implications of results from the p-Pb and Pb-Pb program at the LHC with focus on ultra-peripheral collisions and diffractive production of vector mesons. The data are put into the context of previous studies at HERA and recent results from STAR at RHIC. Emphasis is placed on low x physics, the saturation phenomenon, and its connection to the physics program at the future US Electron-Ion Collider.

slides

- 13 December 2017, 13:15 - joint NQM/HPS seminar - EMMI/KBW auditorium (1.17)

Drell-Yan physics

Matthias Grosse Perdekamp - Illinois University

Abstract

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A. Andronic, V. Friese, B. Friman, R. Holzmann Last modified: Wed Dec 13 15:13:27 CEST 2017