Conveners
Heavy Ions
- David d'Enterria ()
Heavy Ions
- Elena Gonzalez Ferreiro ()
Heavy Ions
- Elena Gonzalez Ferreiro ()
Heavy Ions
- David d'Enterria ()
Description
Allocated time includes time for questions as follows: 15 (13+2), 20 (17+3), 30 (25+5)
Mr.
Marek Chojnacki
(University of Copenhagen, Niels Bohr Institute)
04/07/2014, 09:00
Heavy Ion Physics
Oral presentation
The combination of multiple particle identification systems along with the excellent tracking capabilities makes ALICE a unique tool to study QCD matter at high-temperature and density. The measurements of light flavor hadron production and multi-particle correlations over a broad transverse momentum ($p_{\mathrm{T}}$) range from 100 MeV/c up to 20 GeV/c, are the main soft probes of the...
Dr.
Jovan Milosevic
(University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences)
04/07/2014, 09:20
Heavy Ion Physics
Oral presentation
Measurements of soft particle production probe the collectivity of the medium created in heavy-ion collisions. This presentation focuses on measurements of two- and multi-particle angular correlations in pPb and PbPb collisions. Particular emphasis is placed on studies of long-range correlations in high multiplicity pPb collisions.
Prof.
Mariusz Przybycien
(AGH University of Science and Technology (Poland))
04/07/2014, 09:40
Heavy Ion Physics
Oral presentation
Measurements of low-pT (< 5 GeV) particle production have provided valuable insight on the production and evolution of the quark-gluon plasma in Pb+Pb collisions at the LHC. In particular, measurements of elliptic and higher order collective flow imprinted on the azimuthal angle distributions of low-pT particles directly probe the strongly-coupled dynamics of the quark-gluon plasma and test...
Dr.
Maria Zurita
(University of Santiago de Compostela)
04/07/2014, 10:00
Heavy Ion Physics
Oral presentation
The Large Hadron Electron Collider (LHeC) at CERN is a proposed facility for electron-nucleus scattering which will collide electrons of about 60 GeV energy beam, with the LHC heavy ion beams. The kinematic coverage extends beyond previous deep inelastic lepton-ion experiments by nearly four orders of magnitude towards lower $x_{Bj}$ and higher $Q^2$. This contribution reviews the...
Mr.
Antoni Aduszkiewicz
(University of Warsaw)
04/07/2014, 10:20
Heavy Ion Physics
Oral presentation
Evidence for the onset of deconfinement in central Pb+Pb collisions
was reported by NA49 in fixed target measurements at beam momentum
30A GeV/c. This observation motivated the NA61/SHINE program started
in 2009 at CERN SPS, which, in particular, aims to study properties
of the onset of deconfinement by measurements of hadron production
in proton-proton, proton-nucleus and nucleus-nucleus...
Dr.
Chin-Hao Chen
(RIKEN BNL Research Center)
04/07/2014, 10:40
Heavy Ion Physics
Oral presentation
The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a comprehensive set of measurements in d+Au collisions. Observables in d+Au collisions were originally conceived as a control experiment where no quark-gluon plasma is formed and one could isolate so-called cold nuclear matter effects, including nuclear modified parton distributions and parton multiple scattering. ...
Dr.
Richard Hollis
(University of California, Riverside)
04/07/2014, 11:30
Heavy Ion Physics
Oral presentation
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured a suite of observables for open and closed heavy flavor
in a variety of collision systems, p+p, d+Au, Cu+Cu, Au+Au, U+U, and at different beam energies. These results indicate substantial
modification in the yields of quarkonia, including J/Psi, Psi', and Upsilon states, and a substantial redistribution in momentum...
Dr.
Robert Vertesi
04/07/2014, 11:50
Heavy Ion Physics
Oral presentation
In ultrarelativistic heavy ion collisions, a phase transition
occurs from hadronic matter into a state of deconfined
quarks and gluons. Properties of this new state of
matter, dubbed as the strongly interacting Quark-Gluon
Plasma (sQGP), have been a subject of extensive
measurements at the Relativistic Heavy Ion Collider
(RHIC) in the past decade. Due to their large masses,
charm and...
Dr.
Andry Rakotozafindrabe
(CEA Saclay, IRFU, France)
04/07/2014, 12:10
Heavy Ion Physics
Oral presentation
The last pPb run at 5 TeV which took place at CERN LHC provides measurements of the Nuclear Matter (NM) effects at an unprecedented energy, especially for the heavy quark and quarkonium sectors. The comparison of the experimental results to the phenomenological inputs is therefore essential, both to put stringent constrains of their main features and to envision the next most discriminating...
Zaida Conesa del Valle
(IPN Orsay (CNRS/IN2P3 - Université Paris-Sud))
04/07/2014, 12:30
Heavy Ion Physics
Oral presentation
The experimental laboratory to create and study strongly interacting matter under extreme conditions of temperature and energy density are ultra-relativistic heavy-ion collisions. A transition of hadronic matter to a Quark Gluon Plasma (QGP) phase is predicted by lattice Quantum ChromoDynamics for high enough temperatures. Heavy quarks (charm and beauty) and quarkonia are produced in the early...
Dr.
Lamia Benhabib
(CERN, Switzerland)
04/07/2014, 12:50
Heavy Ion Physics
Oral presentation
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. This talk presents measurements of quarkonia in pp and PbPb collisions at 2.76 TeV and in pPb collisions at 5.02 TeV.
Dr.
Maria Zurita
(University of Santiago de Compostela)
04/07/2014, 13:10
Heavy Ion Physics
Oral presentation
We discuss the Hessian PDF reweighting - a technique intended to estimate the effects that new measurements have on a set of PDFs. The method stems straightforwardly from considering new data in a usual χ2 fit and it naturally incorporates also non-zero values for the tolerance, Δχ2>1. In comparison to the contemporary Bayesian reweighting techniques, there is no need to generate large...
Mr.
Gustavo Conesa Balbastre
(LPSC-CNRS)
05/07/2014, 11:30
Heavy Ion Physics
Oral presentation
Hard-scattered partons are produced early in heavy-ion collisions, prior to the formation of the strongly interacting nuclear medium, the quark-qluon plasma (QGP). These partons lose energy as they traverse the medium and eventually fragment into jets, which exhibit a modification when compared to jets produced in pp collisions. Large transverse momentum (pT) particles, which are proxies for...
Dr.
Garberson Pelin Kurt
(Univ. of Illinois at Chicago, United States)
05/07/2014, 11:50
Heavy Ion Physics
Oral presentation
Jet studies provide experimental means to explore the details of parton-medium coupling and the energy loss mechanisms in QCD matter. In this talk an overview of recent jet and high-pT measurements from 2.76 TeV PbPb and pp collisions with the CMS detector will be presented. Additionally, the latest CMS jet results from pPb collisions at 5.02 TeV will be discussed in the context of initial...
Dr.
Barbara Krystyna Wosiek
(Polish Academy of Sciences (Poland))
05/07/2014, 12:10
Heavy Ion Physics
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 parton showers as they propagate in the quark-gluon plasma, often referred to as "jet quenching", provides insight on the short-distance dynamics of the plasma. Jet quenching has been observed in a variety of single jet, dijet, and photon-jet...
Mr.
Alexis Moscoso Rial
(Universidade de Santiago de Compostela)
05/07/2014, 12:30
Heavy Ion Physics
Oral presentation
It is shown that the anomalous sharp increasing of the strength of the near-side ridge structures
observed in Au-Au collisions at \sqrt{s} = 62 GeV and \sqrt{s} = 200 GeV and the onset of the ridge structure
in pPb and in pp collisions can be naturally explained in the framework of string percolation. In all
the cases the near-side strength reflects the collision area covered by the strings...
Dr.
Enrico Meggiolaro
(University of Pisa (ITALY))
05/07/2014, 12:50
Heavy Ion Physics
Oral presentation
We discuss the role of the U(1) axial symmetry for the scalar and pseudoscalar meson mass spectrum of QCD at finite temperature, above the chiral transition at T_c, using a chiral effective Lagrangian model, which, in addition to the usual chiral condensate, also includes a (possible) genuine U(1)_A-breaking condensate that (possibly) survives across the chiral transition. The motivations for...
Dr.
Daniel Tapia Takaki
(The University of Kansas)
05/07/2014, 15:00
Heavy Ion Physics
Oral presentation
Protons and ions accelerated by the LHC carry an electromagnetic field, which acts as a source of photons. The beam energy at the LHC makes it the most energetic photon source ever built. The interaction of such high-energy photons with nuclei (or protons) can be studied in ultra-peripheral heavy-ion collisions, where the impact parameter is larger than the sum of the nuclear radii and...
Dr.
Chia-Ming Kuo
(National Central University (China))
05/07/2014, 15:20
Heavy Ion Physics
Oral presentation
The electroweak bosons are insensitive to final state effects in heavy-ion collisions and thus make excellent probes of the initial state parton distributions in nuclei. This talk presents measurements of photons and weak bosons, via their leptonic decay channels, in pp and PbPb collisions at 2.76 TeV and in pPb collisions at 5.02 TeV.
Dr.
Marisilvia Donadelli
(Universidade de Sao Paulo (Brasil))
05/07/2014, 15:40
Heavy Ion Physics
Oral presentation
Measurements of vector boson production in Pb+Pb collisions provide
essential control data for studies of jets and jet quenching in the
quark gluon plasma. Because the electroweak bosons do not interact
strongly in the plasma measurements their production rates can be
predicted using standard high-energy event generators. In addition,
the vector boson spectra are potentially sensitive...
Prof.
Joakim Nystrand
(University of Bergen)
05/07/2014, 16:00
Heavy Ion Physics
Oral presentation
The strong electromagnetic fields surrounding the protons and heavy
nuclei accelerated at the CERN Large Hadron Collider may be used to
study two-photon and photon-proton/nucleus interactions at
unprecedented energies. A process of particular interest is two-photon
production of pairs of W bosons. This process is sensitive to the
coupling between photons and W bosons, and may therefore...
Prof.
Michael Klasen
(Institute for Theoretical Physics, University of Münster)
05/07/2014, 16:20
Heavy Ion Physics
Oral presentation
We present a rigorous theoretical analysis of the ALICE measurement of low-p_T direct-photon production in central lead-lead collisions at the LHC with a centre-of-mass energy of \sqrt{s_{NN}}=2.76 TeV. Using NLO QCD, we compute the relative contributions to prompt-photon production from different initial and final states and the theoretical uncertainties coming from independent variations of...
Dr.
Giulia Manca
(University of Cagliari)
05/07/2014, 16:40
Heavy Ion Physics
Oral presentation
The production of J/ψ and Υ-mesons decaying into dimuon final state is studied at the LHCb experiment, with rapidity 1.5 < y < 4.0 or -5.0 < y < -2.5 and transverse momentum pT < 15 GeV/c, in proton-lead collisions at a proton-nucleon centre-of-mass energy of 5 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 1.6/nb. The forward-backward production ratio...
Vivian de la Incera
(University of Texas at El Paso)
05/07/2014, 17:00
Heavy Ion Physics
Oral presentation
An important part of the current research efforts in QCD is focused on finding the phases of nuclear matter that occur at finite densities and temperatures. While the zero density, finite temperature region can be addressed with the help of lattice QCD, and the zero temperature, very high-density region can be explored with weak-coupling QCD, for the strong-interaction region of intermediate...
