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Dr
Magdalena Djordjevic
(Institute of Physics Belgrade, University of Belgrade)
19/05/2014, 11:00
Open Heavy Flavour and Quarkonia
Contributed Talk
Accurate theoretical predictions of jet suppression are necessary for studying the properties of QCD matter created in ultra-relativistic heavy ion collisions. However, testing the prediction accuracy - and extracting useful qualitative knowledge - is often limited by constraining the predictions to only few experimental probes at a time, and by using free parameters. To address this issue, we...
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Alan Dion
(Stony Brook University)
19/05/2014, 11:20
Open Heavy Flavour and Quarkonia
Contributed Talk
In heavy ion collisions at RHIC, heavy quarks are produced predominantly in the initial hard scatterings and thus probe the entire lifetime of the hot and dense medium. Additionally, measuring charm and beauty quarks allows us to study the mass dependence of energy loss, constraining the transport properties of the Quark-Gluon Plasma. Previous measurements at RHIC have shown large suppression...
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Andrea Festanti
(Universita e INFN (IT))
19/05/2014, 11:40
Open Heavy Flavour and Quarkonia
Contributed Talk
Heavy quarks (charm and beauty) are considered effective probes to investigate the properties of the strongly-interacting medium formed in high energy nuclear collisions. Heavy quarks lose energy interacting with the medium via inelastic processes (medium-induced gluon radiation) and elastic collisions. The nuclear modification factor, $R_{\rm AA}$, defined as the ratio of the heavy-flavour...
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Prof.
Zhenyu Ye
(University of Illinois at Chicago)
19/05/2014, 12:00
Open Heavy Flavour and Quarkonia
Contributed Talk
Heavy quarks are dominantly produced from initial hard scatterings in high-energy heavy ion collisions, and their interaction with QCD medium is sensitive to the medium dynamics. Thus heavy quarks are suggested as excellent probes to study the properties of the hot and dense nuclear matter created at the Relativistic Heavy Ion Collider. In this talk, we present the first results of open charm...
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Sanghoon Lim
(Yonsei University)
19/05/2014, 12:20
Open Heavy Flavour and Quarkonia
Contributed Talk
Charm and bottom quarks are formed predominantly by gluon fusion in
the initial hard scatterings at RHIC, making them good probes of the
full medium evolution. Previous measurements at RHIC have shown large
suppression and azimuthal anisotopy of open heavy flavor hadrons in
Au$+$Au collisions at $\sqrt{s_{NN}} = 200$ GeV. Explaining the
simultaneously large suppression and flow of heavy...
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Raphaelle Bailhache
(Johann-Wolfgang-Goethe Univ. (DE))
19/05/2014, 12:40
Open Heavy Flavour and Quarkonia
Contributed Talk
The main purpose of ALICE at the LHC is to investigate the properties of the deconfined state of strongly-interacting matter produced in high-energy heavy-ion collisions. Since heavy quarks, i.e. charm and beauty, are produced on a shorter time scale with respect to the hot fireball, they are suited to probe the interaction dynamics inside the medium.
The ALICE collaboration has measured...
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Jan Uphoff
(Goethe University Frankfurt)
19/05/2014, 14:20
Open Heavy Flavour and Quarkonia
Contributed Talk
The full space-time evolution of heavy quarks and light partons in ultra-relativistic heavy-ion collisions is studied within the partonic transport model Boltzmann Approach to MultiParton Scatterings (BAMPS). We discuss in detail for all flavors the influence of elastic and radiative energy loss with a running coupling. Radiative processes, in particular, are implemented through an improved...
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William Horowitz
(University of Cape Town)
19/05/2014, 14:40
Open Heavy Flavour and Quarkonia
Contributed Talk
We present new predictions for the suppression of heavy quark decay products at RHIC and LHC from a NLO AdS/CFT energy loss model. Previous predictions from a tomographic model based on only the leading order AdS/CFT contribution to energy loss and constrained by RHIC data disagreed with LHC D meson measurements. In this work we include for the first time a correct treatment of the momentum...
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Shuang Li
(Univ. Blaise Pascal Clermont-Fe. II (FR))
19/05/2014, 15:00
Open Heavy Flavour and Quarkonia
Contributed Talk
The LHC heavy-ion physics program aims at investigating the properties
of strongly interacting matter at extreme conditions of temperature and
energy density, where the formation of the Quark-Gluon Plasma (QGP) is
expected.
In high-energy heavy-ion collisions, heavy quarks are regarded as
effective probes of the properties of the QGP as they are created on a
short time scale, with...
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Riccardo Russo
(Universita e INFN (IT))
19/05/2014, 15:20
Open Heavy Flavour and Quarkonia
Contributed Talk
The measurement of heavy-flavour production cross sections in pp collisions at the LHC provides a reference for heavy-ion studies and represents a test for perturbative QCD calculations. In p-Pb collisions, heavy-flavour measurements are essential to assess the effects due to the presence of a nucleus in the initial state, such as the modification of the parton densities and the $k_{\rm...
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Hyunchul Kim
(Korea University (KR))
19/05/2014, 15:40
Open Heavy Flavour and Quarkonia
Contributed Talk
We report the first measurements of fully reconstructed B mesons in collisions involving heavy ions. Rapidity and transverse momentum cross sections, measured at $\sqrt{s_{NN}}=5.02$ TeV with the CMS detector, will be presented. For the same collision system, we will also report on the production of inclusive $b$-hadrons identified via their decays into $J/\psi$ displaced from the primary...
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Sandro Bjelogrlic
(NIKHEF (NL))
19/05/2014, 16:30
Open Heavy Flavour and Quarkonia
Contributed Talk
Heavy quarks (charm and beauty) are excellent probes to study the properties of the strongly interacting matter formed in heavy ion collisions, which is expected to be a Quark-Gluon Plasma (QGP). Indeed, due to their large mass, charm and beauty quarks are produced in initial hard scattering processes among partons of the colliding nuclei, before the formation of the QGP, and they traverse the...
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Shanshan Cao
(Duke University)
19/05/2014, 16:50
Open Heavy Flavour and Quarkonia
Contributed Talk
Heavy flavor hadrons serve as valuable probes of the transport properties of the quark-gluon plasma (QGP) created in relativistic heavy-ion collisions. We introduce a comprehensive framework that describes their full-time evolution in the QGP matter and the subsequent hadronic phase. The heavy quark energy loss in a de-confined QCD medium is modeled with our improved Langevin approach [1] that...
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Dr
Marlene Nahrgang
19/05/2014, 17:10
Open Heavy Flavour and Quarkonia
Contributed Talk
The progress made by experimental collaborations in measuring heavy-flavor particles in heavy-ion collisions with unprecedented precision is accompanied by the advancement of theoretical calculations. Our recently developed model, which couples a Monte-Carlo Boltzmann-propagation of heavy quarks to the 3+1d fluid dynamical evolution from fluctuating EPOS initial conditions reproduces well the...
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Pol Gossiaux
(Subatech)
19/05/2014, 17:30
New Theoretical Developments
Contributed Talk
It is generally admitted that heavy quarks (c and b) created in the early stage of ultrarelativistic heavy ion collisions through hard processes are among the best probes of the later QGP stage. Perturbative QCD allows for the calculation of the production cross sections (in contradistinction to light quarks) and these cross sections have also been measured. Also the details of the...
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Liliana Apolinario
(Universidade de Santiago de Compostela (ES))
19/05/2014, 17:50
New Theoretical Developments
Contributed Talk
The parton branching process is known to be modified in the presence of a medium. Colour decoherence processes are known to determine the process of energy loss when the density of the medium is large enough to break the correlations between partons emitted from the same parent. In order to improve existing calculations that consider eikonal trajectories for both the emitter and the hardest...
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Prof.
Keijo Kajantie
(Helsinki Institute of Physics)
19/05/2014, 18:10
New Theoretical Developments
Contributed Talk
I will discuss a holographic model of finite temperature and density QCD matter with a large and roughly equal number of colors and flavours. The basic framework of the model is 5-dimensional classical Einstein gravity with a black hole and with an AdS$_5$ boundary, on which the physical 4-dimensional quantum theory resides. The model further contains a scalar dilaton for asymptotic freedom...
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Dong Ho Moon
(University of Illinois at Chicago (US))
20/05/2014, 09:00
Open Heavy Flavour and Quarkonia
Contributed Talk
The mechanisms through which charmonia production is modified in the high-density medium created
in ultra-relativistic heavy-ion collisions, are still not quantitatively understood. In order to
disentangle among different scenarios, a multi-dimensional analysis in a wide kinematic range is
needed, in pp, pA and AA collisions, looking at many observables that have different
sensitivities to...
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Julian Book
(Johann-Wolfgang-Goethe Univ. (DE))
20/05/2014, 09:20
Open Heavy Flavour and Quarkonia
Contributed Talk
The ALICE Experiment at the Large Hadron Collider (LHC) provides unique capabilities to study
charmonium production at low transverse momentum. In the early and hottest phase of
nucleus-nucleus collisions the formation of a Quark-Gluon Plasma (QGP) is expected. Several QGP
induced effects, such as the melting of charmonium states due to color screening and/or a
(re)combination of...
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Wangmei Zha
(USTC/BNL)
20/05/2014, 09:40
Open Heavy Flavour and Quarkonia
Contributed Talk
$J/\psi$ suppression in heavy-ion collisions due to color screening of quark and antiquark potential in the deconfined medium has been proposed as a signature of the QGP formation. Other mechanisms, such as the cold nuclear matter effect and charm quark recombination, are likely to contribute to the observed modification of $J/\psi$ production in heavy-ion collisions. Measurements of $J/\psi$...
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Boris Kopeliovich
(UTFSM)
20/05/2014, 10:00
Open Heavy Flavour and Quarkonia
Contributed Talk
A colorless $c\bar c$ dipole propagating through a hot medium can be dissolved either due to Debye screening of the binding potential, or by inelastic (color exchange) interaction with the medium, which turns the dipole into a color-octet state (absorption). Both mechanisms
are included into the path-integral description of the in-medium propagation of the dipole, providing the real and...
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Dr
Taesoo Song
(Frankfurt Institute of Advanced Studies)
20/05/2014, 10:20
Open Heavy Flavour and Quarkonia
Contributed Talk
Using the QCD sum rule with its operator product expansion reliably determined from lattice calculations for the pressure and energy density of hot QCD matter, we calculate the strength of the $J/\psi$ wave function at origin and find that it decreases with temperature when the temperature is above the transition temperature. This result is shown to follow exactly that obtained from the...
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Javier Martin Blanco
(Laboratoire de Physique Subatomique et des Technologies Associe)
20/05/2014, 14:20
Open Heavy Flavour and Quarkonia
Contributed Talk
The study of charmonium production, bound states of c and $\bar{c}$ quarks, is an intense research activity, both experimentally and theoretically. The peculiar properties of some of the charmonium states, like their small size (< 1 fm) and strong binding energy (several hundred MeV), make them ideal probes of the strongly interacting matter, the so-called Quark-Gluon Plasma (QGP), produced in...
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Zvi Citron
(Weizmann Institute of Science (IL))
20/05/2014, 14:40
Open Heavy Flavour and Quarkonia
Contributed Talk
The measurement of Z bosons in heavy ion collisions is an excellent tool for probing the nucleus at the partonic level. The inclusive yield provides a stringent test of binary collision scaling. Recent ATLAS results demonstrate such scaling in Pb+Pb collisions. The 2013 p+Pb physics run at the LHC providing more than 30 $nb^-1$ of collisions
at an energy of $\sqrt{s_{NN}}$ = 5.02 TeV has...
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J. Matthew Durham
(Los Alamos National Laboratory)
20/05/2014, 15:00
Open Heavy Flavour and Quarkonia
Contributed Talk
We present new results of a completed analysis from PHENIX of $\psi'$
modification at midrapidity in 200~GeV $d$$+$Au collisions. Strong
differential suppression of the $\psi'$ relative to the $J/\psi$ is
observed. This has also been reported recently by ALICE at forward and
backward rapidity in 5.0~TeV $p$$+$Pb collisions. In all cases the
differential suppression is too strong to be...
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Roberta Arnaldi
(Universita e INFN (IT))
20/05/2014, 15:20
Open Heavy Flavour and Quarkonia
Contributed Talk
Charmonium states play a relevant role as probes of the phase transition
between hadronic and deconfined matter. According to the color-screening model,
the in-medium dissociation probability of such states should provide an estimate
of the initial temperature.
In nucleus-nucleus collisions, the more loosely bound excited states, as the $\psi(2{\rm S})$,
are expected to melt at lower...
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Dr
Olaf Kaczmarek
(University of Bielefeld)
20/05/2014, 15:40
Open Heavy Flavour and Quarkonia
Contributed Talk
Among quantities playing a central role in the theoretical interpretation of
heavy ion collision experiments at RHIC and LHC are so-called transport
coefficients. Out of those heavy quark diffusion coefficents play an important
role e.g. for the analysis of the quenching of jets containing
$c$ or $b$ quarks ($D$ or $B$ mesons) as observed at RHIC and LHC.
We report on a lattice...
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Cesar Luiz da Silva
(Los Alamos National Lab)
21/05/2014, 09:00
Open Heavy Flavour and Quarkonia
Contributed Talk
PHENIX presents new nuclear modification results on $J/\psi$ in
Cu$+$Au and U$+$U collisions. The recently completed analysis of the
modification of $J/\psi$ production in Cu$+$Au collisions at forward
($1.2< y < 2.2$) and backward ($-2.2 < y < -1.2$) rapidity is the
first measurement of the rapidity dependence of the $J/\psi$
modification in unequal mass heavy ion collisions. Both hot...
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Zhenwei Yang
(Tsinghua University (CN))
21/05/2014, 09:20
Open Heavy Flavour and Quarkonia
Contributed Talk
The production of J/psi and Y-mesons decaying into dimuon final state is studied at the
LHCb experiment, with rapidity 1.5 < y < 4.0 or โ5.0 < y < โ2.5 and transverse
momentum $p_T$ < 15 GeV/c, in proton-lead collisions at a proton-nucleon centre-of-mass
energy $\sqrt{s_{NN}}$ = 5 TeV. The analysis is based on a data sample corresponding
to an integrated luminosity of 1.6 nb$^{โ1}$. The...
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Abdulla Abdulsalam Valiyavalappil Kizhakkepura
(Bhabha Atomic Research Centre (IN))
21/05/2014, 09:40
Open Heavy Flavour and Quarkonia
Contributed Talk
Bottomonia are important probes of the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. The three Y states (1S, 2S, 3S) were measured separately using the Compact Muon Solenoid (CMS) experimental apparatus and observed to disappear sequentially in PbPb collisions at 2.76 TeV. However, recent measurements in pp and pPb...
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Javier Castillo Castellanos
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
21/05/2014, 10:00
Open Heavy Flavour and Quarkonia
Contributed Talk
ALICE is the LHC experiment devoted to the study of heavy-ion collisions. The main purpose of ALICE is to investigate the properties of the deconfined state of nuclear matter, the Quark-Gluon Plasma (QGP). Quarkonium measurements play a crucial role in this investigation. In particular, the sequential suppression of the quarkonium states by colour screening has long been suggested as a...
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Prof.
Pengfei Zhuang
(Tsinghua University)
21/05/2014, 10:20
Open Heavy Flavour and Quarkonia
Contributed Talk
Upsilon production in heavy ion collisions at RHIC and LHC is investigated. While the transverse momentum spectra of the ground state Upsilon(1s) are controlled by the initial state Cronin effect, the excited states
are characterized by the competition between the cold and hot nuclear matter effects and sensitive to the dissociation temperatures determined by the heavy quark potential. We...
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