Nuclear and Quark Matter Seminar 2013
6 Feb. 2013, 14:15 c.t. - EMMI/KBW Lecture Hall (1.17)
Heavy Ion Physics with the ATLAS Experiment
Zvi Citron -- Weizmann Institute, Rehovot, Israel
Relativistic heavy ion collisions seek to create in a controlled setting the conditions present in the universe only a fraction of a second after the big bang. In this brief early moment, the fundamental constituents of matter, quarks and gluons, existed as the relevant degrees of freedom rather than being bound into hadrons as they are today.
Heavy ion colliders, in particular the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory and the Large Hadron Collider (LHC) at CERN, collide heavy particles with such force that at their collision an energy density is reached which rivals that of the early universe. Since the start of RHIC running in 2000, studying this hot dense medium, dubbed the 'quark gluon plasma', has revealed many insights about matter under extreme conditions and the strong force which governs the interactions of quarks and gluons.
The ATLAS experiment at the LHC has a robust heavy ion physics program and in a short two years of running has yielded new and more precise information about the quark gluon plasma. Results from ATLAS in Pb+Pb collisions as well as a first look at collisions from the control p+Pb system will be presented.
13 March 2013, 11:00 c.t. - GSI Lecture Hall SB1 1.200
Hydrodynamical models at various collision energies
Pasi Huovinen -- FIAS and University of Frankfurt, Germany
In this talk I will review recent hydrodynamical studies of LHC data and describe how our understanding of hydrodynamical models and modeling has evolved from the days of SPS and early days of RHIC. I will also discuss the prospects of hydrodynamical modeling of the collisions at the future FAIR and NICA facilities.
17 Apr. 2013, 11:00 c.t. - EMMI/KBW Lecture Hall (1.17)
Heavy quarkonia and the Quark-Gluon Plasma: a saga with (at least) three episodes
Enrico Scomparin - INFN and University of Torino, Italy
The suppression of heavy quarkonium states is considered as one of the key observables for the study of the phase transition from a system made of hadrons towards a Quark-Gluon Plasma. In the last 25 years, experiments at various facilities around the world, and in particular at Brookhaven and CERN, have studied collisions of heavy-ions looking for signals of such a transition. In this seminar, after a brief introduction, I will describe hopes, failures and successes in the study of charmonia and bottomonia and in particular of their survival in a high-temperature QCD medium. A particular emphasis will be given to very recent results obtained in this field at LHC energies by the ALICE, ATLAS and CMS experiments.
29 May 2013, 14:00 c.t. - EMMI/KBW Lecture Hall (1.17)
The Tsallis Distribution at the LHC
Jean Cleymans - University of Cape Town, South Africa
The Tsallis distribution was introduced in 1988 by Constantin Tsallis and has been used in many fields of physics. It has been astonishingly successful in high energy physics describing transverse momentum distributions in p-p collisions at high energies as shown by large experimental collaborations (PHENIX, STAR, ALICE, ATLAS, CMS, ...). Despite this, it has not received much attention from the theoretical high energy physics community. In this talk we will present a short review of the Tsallis distribution focusing on the use in high energy physics. A proposal will be considered to bring consistency to the values of the Tsallis parameter q and the corresponding temperature T.
26 June 2013, 14:15 c.t. - EMMI/KBW Lecture Hall (1.17)
Aspects of 21st Century Nuclear Physics
Silas Beane - University of Bonn
Over the last several decades, theoretical nuclear physics has been evolving from a very-successful phenomenology of the properties of nuclei, toward the ultimate goal of a first-principles derivation of the properties of the visible matter in the Universe from the known underlying theories of Quantum Chromodynamics and Electrodynamics. After a brief motivational introduction, I will present some of the most recent calculations of the simplest nuclear and hypernuclear systems which make use of both lattice QCD and effective field theory methods. These include the first physical predictions of baryon-baryon scattering, the spectrum of the light nuclei and hypernuclei, as well as very recent work which is beginning to illuminate the nuclear fine-tunings that in some sense define the Universe that we live in.
21.08, 14:00 c.t. - EMMI/KBW Lecture Hall (1.17)
Fluctuations on the phase boundary
Bengt Friman - GSI
The relevance of higher order cumulants of net baryon number fluctuations for the analysis of freeze-out and critical conditions in heavy-ion collisions at LHC and RHIC is explored. The generic structure of these cumulants at vanishing baryon chemical potential are related to the O(4) scaling functions. Chiral model calculations are then used to explore their properties at non-zero baryon chemical potential. The sixth and higher order cumulants of baryon number and electric charge offer the possibility to probe the proximity of the thermal freeze-out to the chiral crossover line. Fluctuating quantities related to the deconfinement transition are briefly discussed.
25.09, 14:00 c.t. - Seminar room KBW 5.29 (5th floor)
Heavy flavour physics with the CMS experiment
Vincenzo Chiochia - University of Zurich, Switzerland
The Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider investigates proton-proton collisions at unprecedented center-of-mass energies. In this presentation we review the recent results achieved by CMS in the field of heavy flavour physics, ranging from production cross section measurements, heavy hadron spectroscopy and properties, as well as searches for new physics in rare decays of B hadrons. In particular, we present the observations of a new baryon with beauty, the Xi(b)*0, and of the rare decay B_s->mu+mu-.
23.10, 14:00 c.t. - EMMI/KBW Lecture Hall (1.17)
Heavy ions at the LHC: where do we stand?
Federico Antinori - University of Padua and CERN
The first three years of heavy ion operations at the LHC have led to a rich harvest of results: confirmations, novelties, puzzles and surprises. I shall present a (personal) overview.
20.11, 14:00 c.t. - EMMI/KBW Lecture Hall (1.17)
Precision predictions for heavy-ion collisions - from massless photons to massive quarks and vector bosons
Michael Klasen - University of Muenster
With heavy-ion collision data becoming more precise, theoretical predictions must follow suit. Using photon and heavy-quark production as two examples, we discuss how next-to-leading order QCD calculations, combined with resummation and/or parton showers, help to estimate and reduce theoretical uncertainties, e.g. in the extraction of an effective temperature in central AA collisions and of proton and nuclear parton densities in pp and pA collisions.
27.11, 14:00 c.t. - EMMI/KBW Lecture Hall (1.17)
Heavy-flavour in high-energy heavy-ion collisions
Andrea Dainese - INFN and University of Padua
Heavy flavour hadrons, containing a charm or beauty quark and a light quark, are effective probes of the properties of the hot and dense strongly-interacting medium formed in high energy heavy-ion collisions. Heavy quarks are produced in the early stage of the collision in primary partonic scatterings with large virtuality. They preserve their flavour and mass identity while traversing the medium and can be tagged via the measurement of heavy flavour hadrons in the final state of the collision.
After a brief introduction on the phenomenology of heavy quarks in heavy ion collisions, the exciting observations made so far by the experimental collaborations at RHIC and at the LHC will be reviewed.
Enhanced heavy flavour detection capabilities are at the core of the upgrade programmes of the experiments at both colliders. An outlook on these plans will conclude the presentation.
11.12, 14:00 c.t. - EMMI/KBW Lecture Hall (1.17)
Heavy-ion collisions in a historical perspective
Rudolf Bock - GSI
Last modified: Thu Jan 10 11:13:27 CEST 2013