Bulletin of the American Physical Society
4th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 59, Number 10
Tuesday–Saturday, October 7–11, 2014; Waikoloa, Hawaii
Session KA: Physics of Dense Gluon Systems |
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Chair: Thomas Ullrich, Brookhaven National Laboratory Room: Kohala 1 |
Saturday, October 11, 2014 9:00AM - 9:45AM |
KA.00001: Lessons Learned on Saturation Physics at LHC and RHIC Invited Speaker: Julia Velkovska If a proton or a nucleus is accelerated to ultra-relativistic energy, due to the time dilation, the gluons that arise from quantum fluctuations are expected to last sufficiently long to be probed experimentally. At low Bjorken x, the gluon density becomes large and is expected to result in saturated gluon fields. These effects occur below a saturation scale, which is larger in nuclei by a factor of $A^{1/3}$ than in the proton, thus collisions involving nuclei are expected to reach the saturation regime at lower center-of-mass energy. Understanding the gluon dynamics in the initial state of nucleus-nucleus collisions is crucial for understanding of thermalization, the emergence of collective phenomena and near-perfect fluidity of the subsequent quark-gluon plasma, and the production and propagation of hard probes that are used to infer the QGP properties. Proton-nucleus and deuteron-nucleus collisions provide an opportunity for the study of the initial state of the nucleus at ultra-relativistic energies and search for signatures of saturation in the partonic densities. In this talk, recent results from RHIC and LHC will be presented and discussed in this context. [Preview Abstract] |
Saturday, October 11, 2014 9:45AM - 10:30AM |
KA.00002: QCD with LHC p-p and e-p Collisions Invited Speaker: Masaki Ishitsuka Recent results of quantum chromodynamics (QCD) studies using proton-proton collision data at the CERN Large Hadron Collider (LHC), as well as future prospects with a proton-electron collider project, the Large Hadron Electron Collider (LHeC), are presented. After the discovery of the Higgs boson, main physics subjects of the LHC are detailed studies of the Higgs properties and extensive exploration of new physics beyond the Standard Model at the energy frontier. The LHC is now in a shutdown period for the upgrade and will restart in 2015 first with the center-of-mass energy of 13TeV and the energy will reach 14TeV later on. The luminosity will also significantly increase with time. At a hadron collider, strong interaction takes critical roles. Therefore, comprehensive studies on QCD with theoretical and experimental aspects are essential in order to suppress the systematic uncertainties on the signal and background processes and improve the sensitivities to the new physics at the LHC. Measurements of the cross-sections and kinematics provide important tests of QCD predictions and modeling including higher order perturbative QCD calculations, proton structure encapsulated in parton distribution functions (PDFs) and parton shower and fragmentation processes. Various event topologies, such as productions of jets, electroweak bosons, heavy quarks and combination of these, have been investigated at the LHC to widely test the validity of QCD application. Among them, as an example, W production in association with charm quarks is sensitive to the PDF of strange quarks. In addition, the LHeC project proposes another approach to the QCD studies by a proton-electron collider, i.e. high resolution microscope, with a factor 4 higher center-of-mass energy with respect to the HERA collider, using a 7TeV proton beam at the LHC with a new 60GeV electron beam. Varieties of subjects are expected with the LHeC such as precise measurements of the PDF, distribution of partons at low-x and strong coupling constant. These measurements will enhance physics capability at the LHC and therefore they are highly complementary. Capability of electroweak measurements and forward physics at the LHeC will be also presented. [Preview Abstract] |
Saturday, October 11, 2014 10:30AM - 11:15AM |
KA.00003: Study of hot QCD Matter at RHIC and LHC Invited Speaker: ShinIchi Esumi Recent results on Quark Gluon Plasma researches from high-energy heavy-ion collisions at RHIC and LHC experiments are reviewed, especially collective phenomena and various correlation studies as well as their relation to the hard processes are presented and discussed to investigate the partonic energy loss, the redistribution of the lost energy in the bulk system and possibly the reheating of the plasma. More recently, small colliding systems such as p-A, d-A, 3He-A collisions and high multiplicity p-p collisions are found to provide various interesting observations, which could be related to collective partonic expansion from high initial density in a small system. Such system size dependences and beam energy dependences would give important and crucial tests to understand the properties of the hot QCD matter: Quark Gluon Plasma. [Preview Abstract] |
Saturday, October 11, 2014 11:15AM - 12:00PM |
KA.00004: The Nucleus as a Laboratory for Gluons at an EIC Invited Speaker: Yuri Kovchegov We will review the physics of high gluon density probed in high energy collisions. We will describe how the high gluon density is achieved inside the nuclear wave function at low values of Bjorken-x via the nonlinear evolution equations. The gluon density may get high enough for gluon mergers to start compensating gluon splittings, leading to the phenomenon of gluon saturation. These effects are further amplified in large nuclei, which reach saturation at lower energies (higher x) than protons or light nuclei due to the classical gluon field dynamics. We will describe how the discovery of the saturation physics can be completed and the dense gluon systems can be studied in Deep Inelastic Scattering (DIS) experiments on nuclei at the proposed Electron-Ion Collider (EIC). High gluon density would manifest itself in the measured nuclear structure functions and di-hadron correlations. It would have a particularly visible impact on the diffractive cross section, rendering it larger than what the non-saturation physics would expect it to be. Understanding the physics of saturation would lead to profound progress in our knowledge of QCD and would lead to important consequences for the theory of hadronic and heavy ion collisions. [Preview Abstract] |
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