Prof.
Jaap Dijkhuis
(Utrecht University)
14/11/2012, 09:10
Dr
Michael Strickland
(Gettysburg College)
14/11/2012, 09:20
Quarkonia
The thermal suppression of heavy quark bound states represents an ideal observable for determining if one has produced a quark gluon plasma in ultrarelativistic heavy-ion collisions. In recent years, however, a paradigm shift has taken place in the theory of quarkonium suppression due to new first principles calculations of the thermal widths of these states. These thermal widths are large, eg...
Lizardo Valencia Palomo
(Universite de Paris-Sud 11 (FR))
14/11/2012, 09:50
Quarkonia
ALICE (A Large Ion Collider Experiment), one of the four main experiments at the Large Hadron Collider (LHC), was designed and built to perform dedicated research on heavy ion collisions to study the Quark Gluon Plasma (QGP), a deconfined state of strongly interacting QCD matter.
As heavy flavours are produced on a very short time-scale in the initial hard scattering processes, they can be...
Indranil Das
(Universite de Paris-Sud 11 (FR))
14/11/2012, 10:20
Quarkonia
Heavy quark resonances, produced in high energy heavy-ion collisions,
are important observables for the study of Quantum Chromodynamics (QCD)
interactions at extreme energy-densities. Lattice QCD calculations predict a
phase transition of the nuclear matter to Quark Gluon Plasma
(QGP). The suppression (due to color screening mechanism) or
enhancement (due to regeneration mechanism) of...
Veronica Canoa Roman
(Centro Invest. Estudios Avanz. IPN (MX))
14/11/2012, 11:20
Quarkonia
The ALICE experiment at the CERN Large Hadron Collider allows the study of vector meson production in ultra-peripheral heavy-ion collisions (UPC). Due to the strong electromagnetic fields gamma-gamma and gamma-nucleus processes can be studied.
We report the first results obtained at ALICE on the coherent J/psi photo-production cross section, a process sensitive to the gluon distribution of...
Torsten Dahms
(Ecole Polytechnique (FR))
14/11/2012, 11:50
The Compact Muon Solenoid (CMS) has measured various quarkonium states via their decays into muon pairs in pp and PbPb collisions at sqrt(s_NN) = 2.76 TeV. Quarkonia are especially relevant for studying the quark-gluon plasma since they are produced at early times of the collision and propagate through the medium, mapping its evolution. The most recent results on the production of prompt...
Nora Brambilla
(Institut fuer Theoretische Physik)
14/11/2012, 12:20
I will review the effective field theory description of quarkonium interaction at finite temperature and its phenomenological implications.
Barbara Trzeciak
(Warsaw University of Technology)
14/11/2012, 14:00
Quarkonia
Barbara Trzeciak
for the STAR Collaboration
Warsaw University of Technology / Lawrence Berkeley National Laboratory
The suppression of charmonia production in high energy nuclear collisions relative to proton-proton collisions due to the color screening was proposed as a signature of the formation of Quark-Gluon Plasma. However, there are other effects that may affect the observed...
Manuel Calderon De La Barca
(UC Davis)
14/11/2012, 14:30
Quarkonia
We report on measurements of Upsilon mesons in the dielectron channel with the STAR detector at RHIC.
Upsilon mesons are expected to be sensitive to the deconfinement transition in the Quark Gluon Plasma, and
to be useful in determining the medium temperature. We compare the yield obtained in Au+Au data,
separated into three centrality classes, to the measured cross section from p+p...
Cesar Luiz da Silva
(Los Alamos National Lab),
J. Matthew Durham
(Los Alamos National Laboratory)
14/11/2012, 15:00
Quarkonia
The nuclear modification of quarkonia in heavy ion collisions involves a set of physics parameters like energy density, path length and initial state effects which can be controlled experimentally with variations in the beam energy, use of different species and rapidity ranges. The PHENIX detector recently collected high statistics data using combinations of heavy ion species and beam...
Elena Bratkovskaya
(FIAS)
14/11/2012, 15:30
Quarkonia
Based on the Parton-Hadron-String Dynamics (PHSD) transport approach
we study the suppression pattern of charmonia at SPS and RHIC with
respect to centrality and rapidity employing various model concepts
such as variants of the `comover absorption' model or the `charmonium melting' scenario. A detailed comparison to the RHIC experimental data demonstrates that non-hadronic interactions are...
Olaf Kaczmarek
(University of Bielefeld)
14/11/2012, 16:30
LQCD
I will give a review on recent developments in lattice QCD studies for quarkonia in the quark gluon plasma medium. I will discuss recent progress in the extraction of spectral properties from lattice QCD calculations of hadronic correlation functions. Besides medium modifications of bound states and their dissociation in the plasma I will focus on transport coefficients, like heavy quark...
Szabolcs Borsanyi
(University of Wuppertal)
14/11/2012, 17:00
LQCD
I present various bulk observables from lattice QCD
that characterize the chiral and deconfinement aspects
of the transition at finite temperature. I discuss the
efforts towards a mapping of the QCD phase diagram at small
chemical potentials, and present preliminary results on the
effect of the dynamical charm quark.
Surasree Mazumder
(Variable Energy Cyclotron Centre, Kolkata)
14/11/2012, 17:30
Quarkonia
The momentum dependence of the drag and diffusion coefficients of heavy quarks propagating through a quark gluon plasma (QGP) have been evaluated. The effects of the equation of state and momentum dependence of transport coefficients on the suppression of heavy flavours in QGP have been studied. We observe that the momentum dependence of the transport coefficients plays crucial role in the...
Jan Uphoff
(Goethe University Frankfurt)
15/11/2012, 09:00
Open charm
For the first time in ultra-relativistic heavy ion collisions it is possible at the LHC and also at RHIC to measure the suppression and flow of D mesons directly without any contribution from B mesons, giving direct and unbiased insight to the charm quark interactions with the quark gluon plasma. Model calculations and predictions for the nuclear modification factor and elliptic flow of D...
Alessandro Grelli
(University of Utrecht (NL))
15/11/2012, 09:30
Open charm
The properties of the hot and dense QCD medium formed in ultra-relativistic heavy-ion
collisions, as well as the mechanism of in-medium partonic energy loss, can be
accessed via the measurement of the nuclear modification factor of particle
production. The measurement of D meson production provides key tests of parton
energy-loss models, which predict that charm quarks should experience...
Andrea Festanti
(Universita e INFN (IT))
15/11/2012, 10:00
The ALICE experiment at the LHC is dedicated to the study of ultra-
relativistic heavy-ion collisions, with the aim of investigating the high-density
color deconned state of strongly interacting matter that is expected to be
formed in these collisions.
Heavy quarks serve as a probe of the dynamics of the medium since they are
produced at the early stages of the collisions and they...
Andrea Beraudo
(Universita e INFN (IT))
15/11/2012, 11:00
We present the updated outcomes of a theoretical study of heavy-flavor spectra in AA collisions. The core of the analysis is represented by the study of the propagation of heavy (c and b) quarks in the Quark Gluon Plasma: their dynamics is described through a relativistic Langevin equation, whose transport coefficients are evaluated within a thermal-field-theory approach. Results obtained with...
Prof.
Steffen A. Bass
(Duke University)
15/11/2012, 11:30
Over the past year our group has studied heavy quark energy loss in the context of a Langevin approach. Main emphasis of our study was the question of heavy quark thermalization in a QGP medium as well as the dependence of the most common observables associated with heavy quark energy loss (R_AA and v_2) on various parameters of the medium evolution, to which our Langevin approach is coupled. ...
Jaroslav Bielcik
(Czech Technical University (CZ))
15/11/2012, 12:00
Open charm
The properties of the hot and dense nuclear matter produced at RHIC in heavy ion collisions can be investigated in multiple ways by heavy flavor production.
In this talk, we will present the STAR results of open charm hadron production at mid-rapidity in $p+p$ and Au+Au collisions at
$\sqrt{s_{NN}}$ = 200 GeV. Open charm mesons were reconstructed
directly via hadronic decay channels...
Rafal Maciula
(Institute of Nuclear Physics PAN)
15/11/2012, 14:00
Open charm
I will discuss production of open charmed mesons in proton-proton collisions at the LHC. The cross section for inclusive production of $c \bar c$ pairs is calculated in the framework of the $k_{\perp}$-factorization approach. Taking wide range of $x$ values necessary for the calculation we use and test several unintegrated gluon distributions from the literature. Some of them include effect of...
Dr
Stephane Peigne
(Subatech)
15/11/2012, 14:30
The effects of parton energy loss in cold nuclear matter on heavy-quarkonium suppression in p-A collisions are discussed. It is shown from first principles that at large quarkonium energy E in the nucleus rest frame, the medium-induced energy loss is proportional to E. Using this result, a phenomenological model depending on a single free parameter is able to reproduce J/psi and Upsilon...
J. Matthew Durham
(Los Alamos National Laboratory)
15/11/2012, 15:00
Cold NM
The flexibility of the Relativistic Heavy Ion Collider has allowed the
PHENIX Collaboration to perform detailed measurements of heavy quark
production in p+p, d+Au, Cu+Cu, and Au+Au collisions at 200 GeV, probing a wide range of temperature and collision geometry.Studies of
d+Au collisions have shown significant and surprising cold nuclear
matter effects on both charmonium and open heavy...
Mr
Yasir Ali
(University of Jageollanian)
15/11/2012, 15:30
Open charm
A feasibility study of D0 meson (Open charm) measurements by its decay into two daughter particles, D0 → K+ π−, in central Pb+Pb collisions at the CERN SPS energies will be presented.
The study for the NA61/SHINE experimental setup supplemented
with a future vertex detector that will allow for a precise track and vertex reconstruction at the target proximity. In order to generate the...
Matthew Nguyen
(Ecole Polytechnique (FR))
15/11/2012, 16:30
HQ in jets and b-tag
The flavor dependence of jet quenching is a powerful handle to discriminate models of parton energy loss in heavy ion collisions. While there is evidence for a strong energy loss of heavy quarks from single particle measurements, heavy flavor tagging of fully reconstructed jets has thus far not been achieved in heavy ion collisions. In this talk we demonstrate the capacity of CMS to identify...
Frank Filthaut
(Radboud University Nijmegen)
15/11/2012, 17:00
HQ in jets and b-tag
A large part of the high-pt physics programme at the Tevatron and LHC colliders relies on the identification of jets originating from the fragmentation of b quarks. In my presentation I will discuss the salient features of the b-jet tagging algorithms developed to achieve this goal, and also discuss the methods that have been developed to calibrate the performance of these algorithms.
Dr
Min He
(Hunan University,China)
16/11/2012, 09:00
We compute open heavy-flavor (HF) transport in relativistic heavy-ion collisions by combining a strong-coupling treatment in both macro- and microscopic dynamics (hydro and nonperturbative diffusion interactions) [1]. The hydrodynamic bulk evolution is quantitatively constrained by bulk and multi-strange hadron spectra and elliptic flow [2]. In the Quark-Gluon Plasma (QGP) phase, heavy-quark...
Antoni Szczurek
(I)
16/11/2012, 09:30
HF decays leptons
We discuss charm production at LHC. The production of single $c \bar c$ pairs
is calculated in the $k_t$-factorization approach. We use several
unintegrated gluon distributions from the literature. Some of them
include effect of small-$x$ staturation and fullfil Balitsky-Kovchegov
evolution equation. The hadronization is included with the help of
fragmentation functions found for the...
Thierry Gousset
(Subatech)
16/11/2012, 10:00
The effect of the damping of radiation in an absorptive medium on radiative energy loss is considered. First, the radiation spectrum for a fast parton going through a dense medium is estimated from considerations on the formation time in the QCD context. In a second stage, such a derivation is connected to a full calculation carried out in electrodynamics.
Tomas Aronsson
(Yale University (US))
16/11/2012, 11:00
Tomas Aronsson for the ALICE collaboration
High-energy heavy-ion collisions at the LHC allow for the study of the properties of the quark-gluon plasma (QGP). Heavy quarks, charm and bottom, produced in the initial hard scattering processes of the collision are excellent probes of the QGP. When heavy quarks traverse the QGP they are expected to lose energy and such energy loss is predicted...
Bogdan Theodor Rascanu
(Johann-Wolfgang-Goethe Univ. (DE))
16/11/2012, 11:30
Theodor Rascanu for the ALICE collaboration
In heavy-ion collisions, charm and beauty quarks are produced in
the initial hard scattering processes. They propagate then through the created Quark Gluon Plasma. Therefore they are a sensitive tool to probe the medium's properties.
One way to measure heavy-quarks is via electrons from the semileptonic decay channels of open charm and beauty...
Dr
Philippe Pillot
(Laboratoire de Physique Subatomique et des Technologies Associees)
16/11/2012, 12:00
Heavy flavours (charm and beauty) are expected to provide essential information on the properties of the high-density strongly-interacting system formed in the early stages of high-energy heavy-ion collisions. In particular, the investigation of modifications of heavy-flavour transverse momentum yield will shed light on the nature of the parton-medium interactions, while the measurement of...
Mariusz Przybycien
(AGH Univesity of Science and Technology (PL))
16/11/2012, 14:00
Bottom quarks are important probes to study the hot, dense medium produced in the heavy ion collisions. These heavier quarks are produced at a relatively early stage of the nucleus-nucleus collisions and may have reduced gluon radiation due to the suppression of small angle gluon radiation known as the `dead cone effect’. Because of the heavy mass of b-hadrons, muons from semi-leptonic...
Ryohji Akimoto
(University of Tokyo)
16/11/2012, 14:30
Heavy quark (charm and bottom) is a good probe to study the interaction between partons and quark gluon plasma (QGP). Heavy quarks are created mainly by initial hard scatterings and interaction between heavy quarks and QGP during full space-time evolution is clearly reflected in the final states.
A silicon vertex tracker (VTX) was installed at the PHENIX detector in 2011. The VTX enables us...
Mustafa Mustafa
(Purdue University)
16/11/2012, 15:00
Heavy quarks are produced early in the heavy-ion collisions and are
expected to interact with the created strongly interacting partonic
medium differently from light quarks. Therefore, they can shed
new light on understanding the medium's properties. Simultaneous measurements of spectra and azimuthal anisotropy of electrons from semileptonic decays of heavy flavor hadrons provide...
Pol Gossiaux
(Subatech)
16/11/2012, 15:30
HF decays leptons
Recently, we have proposed a microscopic approach for the quenching and thermalisation of heavy quarks (HQ) in URHIC \cite{Gossiaux:2008,Gossiaux:2009,Gossiaux:2010}, assuming that
they interact with light partons through both elastic and radiative processes evaluated by resorting to some parameterization of the running coupling constant, while those partons are spatially distributed along...
Wolfgang Schaefer
(Institute of Nuclear Physics PAN)
16/11/2012, 16:30
High energy heavy ions are the source of a
flux of Weizs\"acker-Williams photons, which can be
utilized to study the photoproduction of vector mesons
on nuclear targets.
We discuss how information on the small-$x$ gluon
distribution in the nucleus can be obtained.
We present our calculations based on a $k_\perp$-factorization
approach which allows us to construct the unintegrated...
Jason Adrian Kamin
(Johann-Wolfgang-Goethe Univ. (DE))
16/11/2012, 16:55
Charm and bottom quarks are very effective probes of the Quark Gluon
Plasma (QGP) created in heavy ion collisions as they are created in
the initial hard scattering and therefore fully traverse the hot
nuclear medium before fragmentation into the vacuum. Along with a
well-established baseline measurement, any observed modification to
heavy-ion heavy flavor spectra can yield insight into...
Sarah La Pointe
(University of Utrecht (NL))
16/11/2012, 17:20
In high energy heavy-ion collisions heavy-flavour quarks are primarily produced in the early stage of the collision, through initial hard scatterings. This makes them an important probe of the high energy density QCD matter that is formed in the collision, since they should then experience the full evolution of the system. Heavy quarks can be studied through the measurements of open...
Jianwei Qiu
(Brookhaven National Lab)
17/11/2012, 09:00
Jean-Philippe Lansberg
(IPN Orsay, Paris Sud U. / IN2P3-CNRS)
17/11/2012, 09:30
I will briefly review the most important quarkonium-production results at fixed-target experiments (NA50, NA60, Hera-B, E866, ...) reported in the last decade. Then I will move onto the discussion of the many quarkonium-physics opportunities offered by A multi-purpose Fixed-Target ExpeRiment (AFTER) using the proton and lead Large Hadron Collider (LHC) beams extracted by a bent crystal. With...
Dr
Wilke van der Schee
(Utrecht University)
17/11/2012, 10:00
Holography provides an excellent tool to study (certain) strongly coupled gauge theories, which is especially useful if the state is very far from equilibrium. In this talk I will review current progress on thermalization, which is modelled by black hole formation, and highlight recent progress on energy loss using holography. Unfortunately I will also have to point out many caveats and...
Chiara Bianchin
(Acad. of Sciences of the Czech Rep. (CZ))
17/11/2012, 11:00
The ALICE experiment at the LHC studies Pb-Pb and pp collisions with the aim of investigating the properties of the high-density state of strongly-interacting matter, expected to be produced in Pb-Pb collisions.
Heavy quarks are sensitive probes to test the medium properties, since they are formed at shorter time scale with respect to the deconfined state.
The present measurements of the...
Cesar Luiz da Silva
(Los Alamos National Lab),
J. Matthew Durham
(Los Alamos National Laboratory)
17/11/2012, 12:00
Future exp/upgrades
The PHENIX Collaboration is designing a new detector configuration (sPHENIX) to
continue the studies of the recent discoveries at RHIC. The new detector will be
based on a strong solenoid magnet with full azimuthal calorimetry and tracking
coverage as well as displaced-vertex measurement capabilities. A new landmark
of sQGP interaction, color screening and initial state effect studies can...
Volker Friese
(GSI Darmstadt)
17/11/2012, 12:30
