EMMI NQM Seminar

Nuclear and Quark Matter Seminar 2015

Dates:
04.02 | 11.02 | 15.04 | 13.05 | 11.06 | 22.07 | 09.09 | 14.10 | 09.12

Special EMMI Lectures - 5th, 6th, 12th, 13th of March, 2015, at 10:00 - EMMI/KBW Lecture Hall (1.17)
Register on: indico page

Bound states in gauge theories, from QED to QCD
Paul Hoyer - University of Helsinki

Abstract
Perturbative methods allow accurate calculations of QED bound states (atoms). Hadrons have atom-like features, even though their quark and gluon constituents are highly relativistic and confined. The possibility that analytic Hamiltonian methods may be useful also for QCD bound states merits careful attention.
The first lecture will be an overview of the motivations, challenges and status of a Hamiltonian approach to gauge theory bound states. There is a tantalizing possibility that confinement is described by a classical gauge field (Born approximation), with loop corrections being perturbatively calculable. The A^0 potential of mesons is linear when the boundary condition on the homogeneous solutions of Gauss' law is fixed by \Lambda_{QCD}.
Bound states are spatially extended objects which transform non-trivially under boosts (c.f. the classical Lorentz contraction). Relativistic dynamics involves pair creation, giving sea quark distributions. The Born level bound states also feature parton - hadron duality. Scattering amplitudes are defined using the bound states as zeroth order 'in' and 'out' states of the perturbative expansion.
Previous lecture notes can be found in arXiv:1402.5005 and a summary of results in arXiv:1409.4703

Slides

4 February 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

Clusters, Correlations and Quarks: a High-Energy Perspective on Nuclei
John Arrington - Argonne National Laboratory, USA

Abstract
Nuclei form the core of matter, but a description in terms of their fundamental constituents - quarks and gluons - remains elusive. Effective models of nuclei exist for use in different applications: a static nucleus defined simply by its mass and charge distribution in atomic physics, a Fermi gas model of quasi-free nucleons for moderate-energy lepton-nucleus scattering, or a simple bag of quarks for high energy collisions. Recent results suggest that dense structures in nuclei impact measurements across all of these energy scales, from neV atomic transitions to TeV probes sensitive to the parton distributions. I will present data from Jefferson Lab experiments which use multi-GeV electrons to isolate and study extremely dense and energetic components of nuclear structure. A connection between these dense two-nucleon correlations and the EMC effect in nuclei suggests that two-body effects may drive a significant part of the modification of nucleon structure in dense nuclei. I will summarize planned measurements aimed at understanding this link and future possibilities which would require a future Electron-Ion Collider.
Slides

11 February 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

System size from SPS and RHIC BES to LHC
Adam Kisiel - Warsaw University of Technology, Poland

Abstract
Two-particle Bose-Einstein correlations measure the size of the system in relativistic heavy-ion collisions. Together with other observables they provide evidence for collective behavior of matter created there, as well as information about the matter properties, such as its equation of state. Recently the measurements have been extended at both sides of the collision energy spectrum: from the low end at the RHIC BES program and from the top at LHC energies. I will discuss these results and the insight they provide on the properties of the system created at these conditions.
Slides

15 April 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

What can continuum QCD tell us about heavy ion collisions and the hadron spectrum?
Jan Pawlowski - University of Heidelberg

Abstract
In this talk I give an overview over the continuum approach to QCD, and its application and prospects for low energy QCD in- and out-of-equilibrium, its phase structure and the hadron spectrum.
Slides

13 May 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

Dileptons with a coarse-grained transport approach
Hendrik van Hees - University of Frankfurt

Abstract
Electromagnetic probes, i.e., lepton-antilepton pairs (dileptons) and photons, are an important probe for the hot and dense matter created in heavy-ion collisions at all reaction energies. Due to their penetrating nature they are the unique messengers from the hot and dense state of the fireball, allowing insight into the medium properties of the electromagnetic current-current correlator during the whole evolution of the collision. In this talk, I shall review the interesting relations of this signal with fundamental properties of strongly interacting matter, particularly the structure of the QCD phase diagram and the chiral phase-transition. Using a coarse-graining approach to the bulk-medium evolution of the fireball, from the early partonic through a hot/dense hadron-resonance gas to the hadronic freeze-out, as described by the UrQMD transport model, makes state-of-the-art thermal quantum-field theoretical calculations for the dilepton-production rates from thermal partonic and hadronic matter available in such realistic bulk-medium descriptions. With this model a good description of the dilepton invariant-mass and p_t and rapidity spectra over a large range of collision energies (from AGS, GSI-SIS energies over CERN-SPS up to BNL-RHIC) is achieved.
Slides

11 June 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

The ALICE Inner Tracking System upgrade project
Luciano Musa - CERN

Abstract
ALICE (A Large Ion Collider Experiment) is studying the physics of strongly interacting matter, and in particular the properties of the Quark-Gluon Plasma (QGP), using proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN LHC (Large Hadron Collider). The ALICE Collaboration is preparing a major upgrade of the experimental apparatus, planned for installation in the second long LHC shutdown in the years 2018-2019. A key element of the ALICE upgrade is the construction of a new, ultra-light, high-resolution Inner Tracking System (ITS). The primary focus of the new ITS is on improving the performance for detection of heavy-flavour hadrons, and of thermal photons and low-mass dielectrons emitted by the QGP. With respect to the current detector, the new ITS will significantly enhance the determination of the distance of closest approach to the primary vertex, the tracking efficiency at low transverse momenta, and the read-out rate capabilities. This will be obtained by seven concentric detector layers based on a 50 microns thick CMOS pixel sensor with a pixel pitch of about 30x30 microns squared. A key feature of the new ITS, which is optimized for high tracking accuracy at low transverse momenta, is the very low mass of the three innermost layers, which feature a material thickness of 0.3% X0 per layer. I will present the design goals and layout of the new ALICE ITS, a summary of the R & D activities, with focus on the technical implementation of the main detector components, and the projected detector and physics performance.
Slides

22 July 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

Physics highlights from the LHCb experiment
Michael Schmelling - MPI Heidelberg

Abstract
The LHCb detector at the Large Hadron Collider has been optimized for the study of CP-violation and rare decays in the B-meson system, but its unique kinematic coverage, excellent tracking, vertexing and particle identification allow it to contribute to many other fields as well. The talk will focus on selected results obtained from Run 1 of the LHC, both with proton-proton and proton-ion collisions, and give an outlook on the expectations for Run 2.
Slides

9 September 2015, 13:15 - EMMI/KBW 5.29 (5th floor)

Relativistic dissipative hydrodynamics from kinetic theory
Amaresh Jaiswal - GSI

Abstract
Relativistic hydrodynamics has been applied quite successfully to describe the space-time evolution of the quark-gluon plasma formed in high-energy heavy ion collisions. In this talk, I will present some recent developments on the formulation of a causal theory of relativistic dissipative hydrodynamics from kinetic theory. In particular, I will focus on the derivation of higher-order transport coefficients and their effects on the evolution of a hot and dense medium.
Slides

14 October 2015, 13:15 - EMMI/KBW seminar room 5.29 (5th floor)

Recent results on strong interactions from NA61/SHINE
Marek Gazdzicki - University of Frankfurt

Abstract
Recent results from the beam-momentum and system-size scan of the NA61/SHINE experiment at the CERN SPS will be presented. They will include identified hadron spectra, correlations and fluctuations in p+p, Be+Be and Ar+Sc collisions. The discussion will address the main physics goals of NA61/SHINE programme on strong interactions:
- Study of the properties of the onset of deconfinement and
- Search for the critical point of strongly interacting matter.
Slides

9 December 2015, 13:15 - EMMI/KBW Lecture Hall (1.17)

Probing cold dense quark matter with astrophysical multi-messenger observations
Kai Schwenzer - University of Tübingen

Abstract
At the extreme densities realized in compact stars, novel forms of matter are possible. There is a wealth of proposed phases of dense matter, but so far it is not known which of them are realized in the compact star interior. Astrophysical observations of compact stars provide a unique way to find out what they are made of, and a clear discrimination will require all the available data from multi-messenger observations---including thermal x-rays, pulsar timing and future gravitational wave data. The only direct way to probe the opaque interior relies on (astro-)seismology, which in case of compact stars is based on special global oscillation modes (r-modes) that emit gravitational waves. They would prevent pulsars from spinning with their observed high frequencies, unless the dissipation of these modes, determined by the microscopic properties of matter, can damp them. I will show that hadronic matter with standard viscous damping fails to explain the observed data, and therefore so far unestablished, enhanced damping mechanisms would be required. Whereas stars consisting of color superconducting quark matter (e.g. the classic 2SC phase) likewise have problems to explain the data, stars containing unpaired quark matter are consistent with all present data sets. Finally I will discuss the chance to directly detect the gravitational wave emission from r-mode oscillations of compact stars in forthcoming advanced LIGO searches and the information we would gain from such novel data.
Slides

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Last modified: Wed Dec 09 15:13:27 CEST 2015