Conveners
Heavy Ions: Collective Effects and Correlations
- Matthew Nguyen (Centre National de la Recherche Scientifique (FR))
Heavy Ions: Heavy Flavor
- Zvi Citron (Weizmann Institute of Science (IL))
Heavy Ions: BES and Future
- Anne Marie Sickles (Univ. Illinois at Urbana-Champaign (US))
Heavy Ions: Jets and Heavy Flavor Probes
- Marco Van Leeuwen (Nikhef National institute for subatomic physics (NL))
Heavy Ions: Jets and Heavy Flavor Physics
- Anna Stasto (Pennsylvania State University (US))
Jacopo Margutti
(Utrecht University (NL))
04/08/2016, 14:30
Heavy Ions
Oral Presentation
ALICE (A Large Ion Collider Experiment) is designed and optimised to study the properties of the Quark-Gluon Plasma (QGP), a new state of matter, which is expected to be created at the high energy densities reached at the LHC. One of the key observables used to characterize the properties of the QGP is the azimuthal anisotropy in particle production. This so-called anisotropic flow is...
Sarah Campbell
(PHENIX)
04/08/2016, 14:50
Heavy Ions
Oral Presentation
Collisions of simple systems, such as p+p, or p+Nucleus have been used as
benchmarks for our understanding of Heavy Ion Collisions, since it was
assumed they would be free of the effects from hot nuclear matter.โ
Recently long range correlations and anisotropies of momentum spectra have
been seen in such collisions, challenging this assumption. Such phenomena
have been understood to be the...
Igor Lakomov
(CERN)
04/08/2016, 15:10
Heavy Ions
Oral Presentation
Igor Lakomov for the ALICE Collaboration
ALICE is dedicated to the study of the strongly interacting matter, the so-called Quark-Gluon Plasma (QGP), formed in heavy-ion collisions at the LHC. In addition, ALICE also actively participated in the pp and p-Pb collision programs at the LHC. In particular, the measurements of the two-particle azimuthal correlations in pp collisions at 7 TeV and in...
Jinfeng Liao
(Indiana University)
04/08/2016, 15:30
Heavy Ions
Oral Presentation
Anomalous chiral transport processes, with the notable examples of Chiral Magnetic Effect (CME) and Chiral Magnetic Wave (CMW), are remarkable phenomena that stem from highly nontrivial interplay of QCD chiral symmetry, axial anomaly, and gluonic topology. The heavy ion collisions provide a unique environment where a hot chiral-symmetric quark-gluon plasma is created, gluonic topological...
474.
Measurements of flow and correlation phenomena in pp, pPb and PbPb collisions at CMS (15' + 5')
Sandra Padula
(UNESP - Universidade Estadual Paulista (BR))
04/08/2016, 15:50
Heavy Ions
Oral Presentation
Many aspects of anisotropic collective flow in ultra relativistic heavy-ion collisions have been studied extensively in the past years using two or more particle correlations. An overview of collective flow and particle correlation measurements at CMS as a function of transverse momentum, pseudorapidity, event multiplicity, for both charged hadrons or identified particles will be presented....
Anne Marie Sickles
(Univ. Illinois at Urbana-Champaign (US))
04/08/2016, 16:10
Heavy Ions
Oral Presentation
ATLAS measurement of azimuthal correlations between particle pairs at large pseudorapidity separation in pp and pPb collisions are presented. The data were collected using a combination of the minimum-bias and high track-multiplicity triggers. A detailed study of the dependence of two-particle correlations on the charged particle multiplicity, transverse momentum of the pair constituents and...
Jian Sun
(Purdue University (US))
04/08/2016, 17:00
Heavy Ions
Oral Presentation
Studies of Heavy flavor production are of great interest in heavy ion collisions. In the produced medium, the binding potential between a quark and antiquark in quarkonium is screened by surrounding light quarks and antiquarks. Thus, the various quarkonium states are expected to be melt at different temperatures depending on their binding energies, which allows us to characterize the QCD phase...
Ionut Cristian Arsene
(University of Oslo (NO))
04/08/2016, 17:20
Heavy Ions
Oral Presentation
According to lattice QCD calculations, the hot and dense fireball created in relativistic heavy-ion collisions undergoes a phase transition to a relatively long lived deconfined state, named Quark-Gluon Plasma (QGP), which allows the study of QCD in a new regime with respect to pp or elementary particle collisions. Heavy quarks constitute an important probe for QGP studies since they are...
Alexander Rothkopf
(Heidelberg University)
04/08/2016, 17:40
Heavy Ions
Oral Presentation
The bound states of a heavy quark and antiquark ( $b\bar{b},c\bar{c}$ ) are ideal probes of the quark-gluon plasma created in relativistic heavy-ion collisions at the RHIC and LHC, since their comparatively large mass allows them to sample the properties of the bulk over its full lifetime. A rich phenomenology is connected with these states. On the one hand, their sequential melting, as e.g....
Prof.
Maria Beatriz Gay Ducati
(UFRGS)
04/08/2016, 18:00
Heavy Ions
Oral Presentation
It is investigated the exclusive production of quarkonium states in proton-proton and nucleus-nucleus collisions at the LHC employing the light-cone dipole formalism theoretical framework. We calculate the rapidity, amd specially the tranverse momentum distributions for J/Psiยดs and Upsilons, and excited states. Our results are compared to recent experimental data (ALICE and LHCb), and...
Hao Qiu
(LBNL, CA (US))
04/08/2016, 18:20
Heavy Ions
Oral Presentation
Heavy quarks are produced by hard processes early in the collision at RHIC energy, and their interaction with the QCD medium is sensitive to the medium properties. The suppression pattern of heavy quarkonia also carries information about the Quark Gluon Plasma. In this talk we will report selected new measurements of open and hidden heavy flavor hadrons from the STAR experiment, especially...
Dr
Hiroshi Ohno
(Center for Computational Sciences, University of Tsukuba)
04/08/2016, 18:40
Heavy Ions
Oral Presentation
We investigate charmonium and bottomonium correlation and spectral functions in lattice QCD at finite temperature
to understand in-medium properties of charmonia and bottomonia as well as the heavy quark diffusion.
Our simulations with the quenched approximation are performed on large isotropic lattices with a couple of
lattice spacings towards the continuum limit. At temperatures in a range...
Yadav Pandit
(University of Illinois at Chicago)
05/08/2016, 14:30
Heavy Ions
Oral Presentation
The Beam Energy Scan (BES) program at the Relativistic Heavy Ion
Collider (RHIC) is mainly focused on a search for the critical point and
the phase boundary in the QCD phase diagram. The first exploratory
phase of the BES program was successfully completed in 2014, with
Au+Au collisions at center-of-mass energies ranging from 7.7 to 200
GeV. In this talk, we report the beam energy...
Sandor Katz
(Eotvos University)
05/08/2016, 14:50
Heavy Ions
Oral Presentation
We calculate the crossover line between the quark gluon plasma and the
hadron gas phases for small real chemical potentials using lattice
calculations. Since direct calculations at non-vanishing chemical
potentials are hindered by the sign problem we use imaginary chemical
potentials and perform analytic continuation to obtain the real $\mu$ phase
diagram. We use a 4stout staggered fermion...
Michele Mesiti
(University of Pisa and INFN - Sezione di Pisa, Italy)
05/08/2016, 15:10
Heavy Ions
Oral Presentation
The study of the temperature - baryon chemical potential $T-\mu_B$
phase diagram of strongly interacting matter is being performed both
experimentally and by theoretical means. The comparison between the
experimental chemical freeze-out line and the crossover line,
corresponding to chiral symmetry restoration, is one of the main
issues. In this talk I will present our recent determination of...
Attila Pasztor
(Wuppertal University)
05/08/2016, 15:30
Heavy Ions
Oral Presentation
We calculate fluctuations and correlations of conserved charges
in finite temperature QCD up to sixth order. These are interesting
for their sensitivity to criticality, for probing the relevant
degrees of freedom in the QCD medium, for providing stringent
tests on the hadron resonance gas model at low and resummed
perturbation theory at high temperatures, and for being accessible
to heavy ion...
Abhisek Sen
(Georgia State University)
05/08/2016, 15:50
Heavy Ions
Oral Presentation
sPHENIX is a proposal for a second generation experiment at RHIC capable of measuring jets, jet correlations and upsilons to determine the temperature dependence of transport coefficients of the quark-gluon plasma using electromagnetic and hadronic calorimetry and precision tracking. The physics program focuses on systematic measurements near the transition temperature at RHIC with a detector...
Prof.
Anna Stasto
(Pennsylvania State University)
05/08/2016, 16:10
Heavy Ions
Oral Presentation
The LHeC considers electron-ion operation at 0.8 TeV cms energy which extends the kinematic range in deep inelastic lepton-nucleus scattering by 3 orders of magnitude in terms of the 4-momentum transfer $Q^2$ and $1/x$. This also exceeds by far the energy reach of a low energy electron-ion colliders currently under study. The very high energy and luminosity have the potential to thoroughly...
Zvi Citron
(Weizmann Institute of Science (IL))
05/08/2016, 17:00
Heavy Ions
Oral Presentation
Photons and weak bosons do not interact strongly with the dense and hot medium formed in the nuclei collisions, thus should be sensitive to the nuclear modification of parton distribution functions (nPDFs). The in-medium modification of heavy Charmonium states plays an important role in studying the hot and dense medium formed in the larger collision systems. The ATLAS detector, optimized for...
Takashi Hachiya
(BNL)
05/08/2016, 17:20
Heavy Ions
Oral Presentation
Heavy quark production in heavy ion collisions has been used as a probe of
the strongly coupled quark gluon plasma in two ways. One is the study of
the collision centrality and transverse momentum dependence of the
modification of open heavy flavor yields in A+A collisions, which
provides information about the coupling of the heavy quark to the medium.
The other is the study of the...
Francesco Bossu
(Orsay-LAL)
05/08/2016, 17:40
Heavy Ions
Oral Presentation
In 2015, the LHCb experiment has started to acquire data during the ion-ion runs of the LHC.
In this talk we present the results of the first data analyses and discuss the prospects for the LHCb ion-ion collision programme.
Marta Verweij
(CERN)
05/08/2016, 18:00
Heavy Ions
Oral Presentation
High pT jet and hadron studies provide experimental means to explore the energy loss mechanisms in QCD matter. CMS is particularly suitable for those measurements. In this talk, an overview of recent jet and high-pT measurements from pp, pPb and PbPb collisions with the CMS detector will be presented. The latest CMS jet results from PbPb collisions at 5.02 TeV and the plan for future analyses...
Martin Spousta
(Charles University)
05/08/2016, 18:20
Heavy Ions
Oral Presentation
Jets provide a powerful tool for probing the dynamics of the quark-gluon plasma created in Pb+Pb collisions at the LHC. The modification of high-pT jets as they propagate in the quark-gluon plasma provides insight on structure of the plasma at short-length scale. Such modifications have been observed in a variety of measurements of single jet, dijet, photon-jet and charged-particle...
Krzysztof Kutak
(Instytut Fizyki Jadrowej Polskiej Akademii Nauk)
05/08/2016, 18:40
Heavy Ions
Oral Presentation
We study forward dijet production in dilute-dense hadronic collisions. By considering the appropriate limits, we show that both the transverse-momentum-dependent (TMD) and the high-energy factorization formulas can be derived from the Color Glass Condensate framework. We propose a new formula for forward dijets that encompasses both situations and is therefore applicable regardless of the...
Davide Caffarri
(CERN)
06/08/2016, 14:00
Heavy Ions
Oral Presentation
The heavy-ion physics program at the LHC aims at characterizing the high energy density, high temperature, deconfined partonic state of matter called Quark-Gluon Plasma.
Hard probes are very useful tools to study the QGP properties since they are abundantly produced at the LHC energy regime, via hard scattering processes, and they experience the full evolution of the system, losing energy...
Dr
Yang-Ting Chien
(Los Alamos National Laboratory)
06/08/2016, 14:20
Heavy Ions
Oral Presentation
The jet quenching phenomena in heavy ion collisions provide a strong evidence of the modification of parton shower in the quark-gluon plasma (QGP). Jet substructure observables can probe various aspects of the jet formation mechanism. They contain useful information about the QGP and allow us to study the medium properties in great details. Here we present theoretical calculations of jet...
Nathan Grau
(PHENIX)
06/08/2016, 14:40
Heavy Ions
Oral Presentation
Much of our understanding of the properties of strongly-coupled quark gluon
plasma depend on measurements of particle jets from hard-scattering of
nucleons in ion-ionโcollisions.โ Measurements of jet and particle yields
as a function of transverse momentum and collision centrality have shown
strong path-length-dependent energy loss of partons traversing the medium.โ
Recently, measurements of...
Dr
NIHAR RANJAN SAHOO
(Texas A&M University)
06/08/2016, 15:00
Heavy Ions
Oral Presentation
Hard probes created through large momentum transfers are used to
study the properties of QCD matter created in heavy-ion collisions, by
comparing the measurements to those in p+p collisions. Jets, and the
"quenching" or suppression of jets in the medium created in heavy-ion
collisions, are studied through various observables. We
present the recent measurements from...
Andrey Sadofyev
(MIT)
06/08/2016, 15:20
Heavy Ions
Oral Presentation
We use holography to analyze the evolution of an ensemble of jets, with an initial probability distribution for their energy and opening angle as in proton-proton (pp) collisions, as they propagate through an expanding cooling droplet of strongly coupled plasma as in heavy ion collisions. We identify two competing effects: (i) each individual jet widens as it propagates; (ii) the opening angle...
