Elena Gonzalez Ferreiro
(Universidade de Santiago de Compostela (ES))
23/07/2015, 09:00
Heavy Ion Physics
talk
In nucleus-nucleus collisions, quarkonium production is expected to be significantly suppressed as a consequence of the colour screening of the force that binds the ccbar (bb) state. In this scenario, quarkonium suppression should occur sequentially, according to the binding energy of each state. As a consequence, the in-medium dissociation probability of these states can provide an estimate...
Lamia Benhabib
(CERN)
23/07/2015, 09:25
Heavy Ion Physics
talk
Quarkonia are important probes of the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. In this talk we present the latest results on quarkonium production in pPb and PbPb collisions from CMS. Selected results from measurements of nuclear modification factors, excited-to-ground state ratios, elliptic flow and forward-backward...
Michal Sumbera
(Acad. of Sciences of the Czech Rep. (CZ))
23/07/2015, 09:45
Heavy Ion Physics
talk
We discuss possible experimental tests of the Color-Singlet model (CSM) in associated J/psi or Y plus leading hadron production in pp collisions at RHIC and LHC energies. Using color dipole approach we calculate several different observables of leading hadron and rapidity/azimuth difference between produced J/psi or Y and the leading hadron in the CSM approach. As a very promising measurement...
Petr Chaloupka
(Czech Technical University in Prague)
23/07/2015, 10:05
Heavy Ion Physics
talk
In the collisions of heavy ions the nuclear matter can undergo a phase transition from hadrons to a state of deconfined quarks and gluons, the Quark-Gluon Plasma (QGP). Suppression of heavy quarkonia due to Debye-like screening of the quark-antiquark potential, has been predicted to be a sensitive indicator of the thermodynamical properties of the created QGP. However, cold nuclear effects and...
Ryan Mackenzie White
(Federico Santa Maria Technical University (CL))
23/07/2015, 10:25
Heavy Ion Physics
talk
The production rates of heavy quarkonia states in A-A collisions provide sensitive probes to the hot and dense QGP. However, a reference for understanding the dissociation in the hot medium is necessary; p-A collisions open the possibility to study heavy quarkonia states in a smaller system. This is an important step in forming a baseline for understanding A-A collisions, as well as an...
Fulvia De Fazio
(INFN Bari)
23/07/2015, 10:45
Heavy Ion Physics
talk
The relaxation towards the hydrodynamic
regime of a boost-invariant non Abelian plasma taken
out-of-equilibrium is investigated using a holographic approach.
In the dual description, the system is driven out-of-equilibrium by
boundary sourcing,
a
deformation of the boundary metric, as proposed by Chesler and Yaffe.
The corresponding Einstein equations in the bulk are solved, and the...
Lizardo Valencia Palomo
(Univ. Blaise Pascal Clermont-Fe. II (FR))
23/07/2015, 11:30
Heavy Ion Physics
talk
Quantum Chromodynamics (QCD) predicts that at high energy density, ordinary nuclear matter undergoes a phase transition towards a new state of matter called Quark-Gluon Plasma (QGP) that is characterized by deconfined quarks and gluons. High-energy Pb-Pb collisions are used to reach the thermodynamical conditions to create the QGP. As heavy quarks (charm and beauty)
are produced in the...
Marco Meissner
(Ruprecht-Karls-Universitaet Heidelberg (DE))
23/07/2015, 11:50
Heavy Ion Physics
talk
LHCb's unique forward acceptance and particle-ID capabilities allow for complementary measurements in proton-ion interactions. Latest results are shown and prospects for ion-ion and ion-gas collisions are presented.
Mrs
Olga Rusnakova
(CTU Prague)
23/07/2015, 12:10
Heavy Ion Physics
talk
The properties of the strongly interacting Quark-Gluon Plasma, created in high energy heavy-ion collisions, can be studied using heavy quarks, such as charm and bottom. Heavy quarks may interact with the medium differently than light quarks. For example, energy losses of the heavy quarks through gluon radiation are expected to be smaller due to the dead cone effect. Therefore, measurements of...
Diego Stocco
(Laboratoire de Physique Subatomique et des Technologies Associe)
23/07/2015, 12:30
Heavy Ion Physics
talk
Heavy-flavour hadrons are effective probes of the Quark-Gluon Plasma which is produced in ultra-relativistic heavy-ion collisions.
Heavy quarks (charm and beauty) are produced in the hard scattering processes at the initial stages of the collision and they subsequently traverse the medium, losing energy in the interaction with its constituents.
Heavy-flavour measurements are hence sensitive...
Jan Rusnak
(Nuclear Physics Institute Prague)
23/07/2015, 14:30
Heavy Ion Physics
talk
Jets represent an important tool to explore the properties of the hot
and dense nuclear matter created in heavy-ion collisions. However,
their reconstruction presents a challenging task due to the extremely
large and fluctuating background that overwhelm the true hard jet
population.
We present recent measurements of charged jets in
Au+Au collisions, by the STAR collaboration at RHIC,...
Dennis Vadimovich Perepelitsa
(Brookhaven National Laboratory (US))
23/07/2015, 14:50
Heavy Ion Physics
talk
In relativistic collisions of heavy ions, a hot medium with a high density of unscreened color charges is produced, and jets propagating through this medium are known to suffer energy loss. This results in several distinct effects seen in central heavy ion collisions: the yield of inclusive jets measured via the nuclear modification factor is observed to be strongly suppressed; the yield of...
Yue Shi Lai
(Massachusetts Inst. of Technology (US))
23/07/2015, 15:15
Heavy Ion Physics
talk
Collisions of high-energy nuclei create the hottest and densest matter ever produced in laboratory, and it is a ground for studies of QCD in extreme conditions. When compared to collisions of protons, the contrasts of the jets and hadrons observed in PbPb collisions provide signatures of phenomena that appear in such conditions. One such phenomenon is called โjet quenchingโ which refers to the...
Jacek Tomasz Otwinowski
(Polish Academy of Sciences (PL))
23/07/2015, 15:40
Heavy Ion Physics
talk
Recent results on particle production in p--Pb collisions at the LHC
exhibit features that are similar to those observed in Pb-Pb collisions.
This indicates that final-state collective effects might also be present
in small collision systems. In order to quantify the effects, the
transverse momentum spectra (pT) of charged particles, identified
hadrons and jets measured in different...
Damir Devetak
(University of Belgrade (RS))
23/07/2015, 16:30
Heavy Ion Physics
talk
The observation of long-range two-particle correlations in high energy heavy ion collisions opens the opportunities of exploring novel QCD dynamics in quark gluon plasma (QGP), the hot dense matter created in heavy ion collisions. In particular, such correlations are sensitive to the degree of thermalization in the system. We present selected results from non-identified and identified...
Dr
Jan Fiete Grosse-Oetringhaus
(CERN)
23/07/2015, 16:50
Heavy Ion Physics
talk
Angular correlations of two and more particles are a sensitive probe of the transport properties of the system produced in heavy-ion collisions. In pp and p-Pb collisions, recent results revealed intriguing long-range correlation structures reminiscent of features observed in heavy-ion collisions. We will show recent results from the analysis of two-particle correlations in pp, p-Pb, and Pb-Pb...
Maja Katarzyna Mackowiak-Pawlowska
(Warsaw University of Technology (PL))
23/07/2015, 17:10
Heavy Ion Physics
talk
The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions in the CERN SPS energy range.
In this contribution results on the energy dependence of hadron spectra and yields as well as on...
Dr
Enrico Fragiacomo
(INFN, Trieste (IT))
23/07/2015, 17:30
Heavy Ion Physics
talk
Hadronic resonances provide valuable observables for the properties of the hot and dense hadronic phase of the fireball created in heavy-ion collisions, since their lifetimes, of the order of few fm/c, are comparable to the time span between the chemical and kinetic freeze-outs, which characterize the latest stage of the fireball evolution. Re-scattering of decay products and regeneration via...
Manuel Colocci
(Universita e INFN, Bologna (IT))
24/07/2015, 09:00
Heavy Ion Physics
talk
In ultra relativistic heavy-ion collisions a large and similar amount of nuclei and anti-nuclei is produced in the central pseudorapidity region allowing one to deeply investigate their properties. Mass and electric charge are expected to be the same in nuclei and anti-nuclei as long as the CPT invariance holds for nuclear force, a remnant of the underlying strong interaction between quarks...
Nestor Armesto Perez
(Universidade de Santiago de Compostela (ES))
24/07/2015, 09:20
Heavy Ion Physics
talk
The LHeC is a proposed upgrade of the LHC to study ep/eA collisions in the TeV regime, by adding a 60 GeV electron beam through an Energy Recovery Linac. In this talk new results are presented on the physics prospects on energy frontier eA collisions with this machine, with emphasis on the precise determination of nuclear parton densities.
Prof.
Alexander Sorin
(Joint Institute for Nuclear Research, Dubna)
24/07/2015, 09:40
Heavy Ion Physics
talk
The NICA (Nuclotron-based Ion Collider fAcility) project is now under active realization at the Joint Institute for Nuclear Research (JINR, Dubna). The main goal of the project is an experimental study of hot and dense strongly interacting matter in heavy ion (up to Au) collisions at centre-of-mass energies up to 11 GeV per nucleon. Two modes of the operation is foreseen, collider mode and...
Barbara Trzeciak
(Czech Technical University in Prague)
24/07/2015, 10:00
Heavy Ion Physics
talk
The multi-TeV LHC beams offer the possibility to perform the most energetic fixed-target experiments ever, in order to study with high precision pp and pA collisions at $\sqrt{s_{NN}} \simeq 115$ GeV and Pbp and PbA collisions at $\sqrt{s_{NN}} \simeq 72$ GeV. AFTER@LHC -- A Fixed-Target ExperRiment -- can greatly complement collider experiments, in particular those of RHIC and EIC projects....
Antoni Szczurek
(Institute of Nuclear Physics),
Mariola Jadwiga Klusek-Gawenda
(Polish Academy of Sciences (PL))
24/07/2015, 10:20
Heavy Ion Physics
talk
We present, for the first time, differential distributions for two $\rho^0$ meson
production in exclusive ultraperipheral, ultrarelativistic collisions
via a double scattering mechanism. The calculations are done in the impact
parameter space. The cross section for $\gamma A \to \rho^0 A$ is
parametrized based on an existing calculation. Smearing of $\rho^0$ masses
is taken into account....
Prof.
Khaled Abdel-Waged
(Physics Department-Umm Al-Qura University- Saudi Arabia)
24/07/2015, 10:40
Heavy Ion Physics
talk
A simple basic model for describing proton-nucleus collisions has been the intra-nuclear cascade model, where the interactions are simulated by a sequence of binary nucleon-nucleon collisions. This model helped to establish many scientific concepts and also creates the foundation for more modern simulation codes, especially at low and intermediate energies. In this paper, we present a new...
Miguel Arratia
(University of Cambridge (GB))
24/07/2015, 11:30
Heavy Ion Physics
talk
The measurement of centrality and pseudorapidity dependence of the $p_{T}$-integrated flow harmonics, $v_{2}$ up to $v_{5}$, in Pb+Pb collisions at $\sqrt {s_{NN}}$=2.76 TeV with the ATLAS detector at the LHC are presented. These measurements give a clear picture of the average geometry as well as fluctuations in it. These measurements are extended to include the correlations between flow...
Jana Crkovska
(FNSPE CTU Prague)
24/07/2015, 11:50
Heavy Ion Physics
talk
The hadronic collective flow was found to be one of the most pronounced signatures of the Quark-Gluon Plasma (QGP), the hot and dense matter created in the collisions of relativistic heavy ions.
The azimuthal distribution of detected hadrons can be expanded into a Fourier series over the azimuthal angle, the flow harmonics are then represented by the Fourier coefficients.
In semi-peripheral...
Gyulnara Eyyubova
(Czech Technical University (CZ)), Mr
Ponimatkin Georgij
(Ostrov Industrial High School (CZ))
24/07/2015, 12:10
Heavy Ion Physics
talk
Heavy-flavour quarks are predominantly produced in hard scattering on a short time-scale and traverse the
medium interacting with its constituents, thus they are one of the effective probes of the transport properties of the medium formed in relativistic heavy ion collisions. On the other hand, the thermal production of heavy-flavour quarks in quark-gluon plasma is itself of interest.
In...
Harri Niemi
(University of Jyvรคskylรค)
24/07/2015, 12:30
Heavy Ion Physics
talk
One of the main goals in heavy ion collision experiments at relativistic energies is to determine the properties, like viscosity, of nearly thermalized strongly interacting matter. The dynamics of the system formed in these collisions is, however, complex and the matter properties reflect into the experimental observables in a non-trivial way. Therefore, it is essential to have a good...
