Nuclear and Quark Matter Seminar 2018

Dates:
31.01. | 21.02. | 07.03. | 25.04. | 27.06. | 25.07. | 12.09. |

Previous years: 2017 | 2016 | 2015 | 2014 | 2013

• 31 January 2018, 13:30 - Main Lecture Hall (SB 1.201)
  
  Andreas Bauswein - University of Heidelberg
  Neutron star mergers
  
  Abstract
  In August 2017 the LIGO-Virgo network detected for the first time gravitational waves from a neutron star merger. The event, dubbed GW170817, was followed by electromagnetic radiation. Various emission mechanisms produced radiation at different wavelengths throughout the electromagnetic spectrum from gamma rays to radio. The gravitational and electromagnetic radiation has provided a wealth of information on the physics of neutron star mergers. In particular, it was possible to infer constraints on stellar properties of neutron stars and the only incompletely known equation of state of high-density matter. Specifically, bounds on neutron star radii have been derived from this very first observation of a neutron star merger. Future detections with increased sensitivity promise accurate and robust measurements of neutron star properties and thus to elucidate properties of high-density matter.
  Slides

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• 21 February 2018, 13:30 - Main Lecture Hall (SB 1.201)
  
  Ulrich Mosel - Justus-Liebig University Giessen
  Neutrino interactions with nuclei and long-baseline experiments
  
  Abstract
  The extraction of neutrino mixing parameters and the CP-violating phase from neutrino long-baseline experiments requires knowledge of the neutrino energy. This energy must be reconstructed from the final state of a neutrino-nucleus reaction since all long-baseline experiments use nuclear targets. This reconstruction requires detailed knowledge of the neutrino reactions with bound nucleons and of the final state interactions of hadrons with the nuclear environment. Quantum-kinetic transport theory has been used to build the event generator GiBUU that has been applied to and tested for many different reactions, from heavy-ion collisions to neutrino-nucleus reactions. In this talk I will confront results of GiBUU with results from neutrino experiments. Some examples are also discussed that show the effects of nuclear interactions on observables in long-baseline experiments.
  

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• 7 March 2018, 13:30 - Theory seminar room KBW 2.27
  
  Vladimir Skokov
  Saturation framework results on multiplicity biased pA collisions
  
  Abstract
  The nuclear modification factor RpA(p) provides information on the small-x gluon distribution of a nucleus at hadron colliders. Several experiments have recently measured the nuclear modification factor not only in minimum bias but also for central p+A collisions. In this talk I analyze the bias on the configurations of soft gluon fields introduced by a centrality selection via the number of hard particles. The biased nuclear modification factor QpA(p) for central collisions is above RpA(p) for minimum bias events, and that it may redevelop a Cronin peak even at small x.
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• 25 April 2018, 13:30 - Side room Lecture Hall (SB 1.201)
  
  Rene Brun - CERN
  Evolution of the HBOOK, ZEBRA, GEANT, PAW, ROOT systems
  
  Abstract
  The ROOT system is today widely used in many High Energy and Nuclear Physics applications, but also in many other fields of science, engineering and a growing use in many other domains. ROOT provides many libraries for visualization, math and statistics, and also many interfaces to external systems. It includes an advanced I/O system to save and retrieve any objects in an efficient way from local or network-wide data sets. The self describing data sets support reading experimental data objects evolving in time. ROOT has been continuously developed since 1995 in the same spirit and guidelines of its predecessor PAW. In the talk I plan to discuss not only the technological developments of these two systems, but also the sociological frame, the competition, the international software context with its odd and good aspects accompanying the birth and development of the ROOT system.
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• 27 June 2018, 13:15 - EMMI/KBW Lecture Hall (1.17)
  
  Gergely Endrödi - Goethe University Frankfurt
  The phases of hot/dense/magnetized QCD from the lattice
  
  Abstract
  In this talk I will discuss the phase structure of QCD in the presence of high temperatures, strong background magnetic fields and nonzero isospin asymmetry. The phase diagram in the space of these parameters can be explored via first principles lattice simulations, and contributes to our understanding of the physics of off-central heavy-ion collisions, compact stars and the evolution of the early universe. Following a short introduction, the first part of the talk will summarize the current status of research on the phase diagram with background magnetic fields. The second part will be devoted to the presentation of recent results on QCD with an isospin-asymmetry. The latter setup poses various challenges for the simulations that require conceptual improvements. These, together with potential applications of the results, will be addressed in some detail.
  

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• 25 July 2018, 13:30 - Side room Lecture Hall (SB 1.201)
  
  Matthias Kaminski - University of Alabama
  Strengths of the holographic approach at high baryon densities
  
  Abstract
  Holographic methods allow to calculate observables at high densities in strongly coupled quantum field theories. We apply effective theories such as hydrodynamics, together with holographic calculations. This approach leads to either effective quantitative results, or qualitative results, which can be observed in experiments. After a brief introduction to holography, we are going to discuss results obtained for observables in states of high density. Such observables are, for example, correlation functions, pressures, energy density, charge densities, currents, and transport coefficients.
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• 12 September 2018, 13:30 - EMMI/KBW Lecture Hall Side room (1.17)
  
  Alexander Kalweit - CERN
  Anti- and hyper-nuclei at the LHC and in the cosmos
  
  Abstract
  The ALICE collaboration has recently released a series of measurements of the production of anti and hyper-nuclei in pp, p-Pb, and Pb-Pb collisions at LHC energies. These results do not only serve to understand the properties of the hot QCD medium created in these collisions, but also help to clarify the origin of the anti-nuclei candidates which are observed by space-borne experiments such as AMS-02. An overview of the existing ALICE results and their interpretation in terms of coalescence and thermal-statistical models will be given. In addition, the talk will focus in particular on the ALICE physics program in the years 2020-2028 which will allow to study these objects with unprecedented precision.
  

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