Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session 1WC: QCD and the Quark Gluon Plasma I |
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Chair: Ivan Vitev, Los Alamos National Laboratory Room: Hilton Hotel Mesa C |
Tuesday, November 2, 2010 3:00PM - 3:30PM |
1WC.00001: Recent progress in spin physics Invited Speaker: In this talk, I will review some recent progress in spin physics, relevant to both longitudinal and transverse spin phenomena. In the first part, I discuss the spin structure of the proton, particularly in connection with the quark and gluon spin contribution which could be extracted from the longitudinal spin experimental data. In the second part, I discuss the single transverse spin asymmetry, particularly how to understand them in the QCD factorization framework. We will review the most important progress in recent years in connection with the universality and/or non-universality of the relevant parton distributions and fragmentation functions. [Preview Abstract] |
Tuesday, November 2, 2010 3:30PM - 4:00PM |
1WC.00002: Recent Highlights from the Spin Program at PHENIX Invited Speaker: The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has demonstrated the unique ability to collide beams of longitudinally and transversely polarized protons at center of mass energies up to $\sqrt s $= 500 GeV. EMC experiment and later DIS experiments showed that the quark spin only contribute about a third to the total spin of the nucleon. Since then several experiments are trying to determine its other contributions. In particular the contribution by the gluon spin was expected to be large. With the applicability of the factorized perturbative QCD (pQCD) and gluons in a leading order process, RHIC provides a unique opportunity to access to the gluon spin in the proton. The PHENIX experiment has studied the polarized gluon distribution via several channels such as $\pi^0$, $\eta$, direct photons and heavy flavor which are already partially included in most recent global analysis. With RHIC full energy (${\sqrt{s}}$= 500 GeV), W boson provides a unique way to separate the flavor spin components with the high scale of $Q^2$ and no fragmentation involved. Large single transverse spin asymmetries of hadrons were observed by the E704 experiment in the light hadron production in the forward rapidity. PHENIX has been studying these single spin asymmetries with a variety of final state particles in different rapidity ranges to try to understand the underlying physics, including effects from the Sivers function, the Collins effect, higher contributions, or combinations of all of the above. In this talk, we report highlight from PHENIX spin program. [Preview Abstract] |
Tuesday, November 2, 2010 4:00PM - 4:30PM |
1WC.00003: Highlights from the Spin Experimental Program at STAR Invited Speaker: The RHIC accelerator complex has the capability to collide polarized protons with arbitrary spin combinations in the energy range from 62-500 GeV. The particle tracking and calorimetry coverage of the STAR experiment allows us to measure both longitudinal and transverse, single and double spin asymmetries for final state particles such as pions, jets and Ws from central rapidity to nearly beam rapidity. Each of these measurements serves a purpose in resolving the spin of the proton into it's constituent parts. We will present an overview of the STAR proton spin program through the measurement of spin asymmetries of different types: double-longitudinal asymmetries which are sensitive to the gluon spin, single-longitudinal asymmetries for Ws which come from anti-u and d quark flavor asymmetries at low $x$ and the large single transverse asymmetries at forward rapidities which arise from the partonic transverse momentum within the proton. [Preview Abstract] |
Tuesday, November 2, 2010 4:30PM - 5:00PM |
1WC.00004: COFFEE BREAK
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Tuesday, November 2, 2010 5:00PM - 5:30PM |
1WC.00005: Theoretical overview of cold nuclear matter effects Invited Speaker: In this talk I will discuss the physics of hadron and nucleon scattering at high energies from the theoretical perspective. I will focus on the phenomena related to the high patron densities which occur at extremely small values of Bjorken x accessible at these energies. Emphasis will be placed onto the initial stages of the nuclear and hadronic collisions and current physical models will be described (such as Color Glass Condensate). I will also discuss specific measurements involving nuclear targets which provide tests and verification of these ideas. [Preview Abstract] |
Tuesday, November 2, 2010 5:30PM - 6:00PM |
1WC.00006: Cold nuclear matter effects on QCD processes at fixed target and collider experiments Invited Speaker: During the early 1980s, the EMC collaboration made the startling discovery that deep inelastic scattering cross sections were strongly modified in nuclear matter. Since then, numerous experiments have shown that other basic QCD processes, such as Drell-Yan and quarkonium production, are also affected. A variety of models have been developed to interpret these data, including modified parton distributions in nuclei, parton energy loss and scattering, changes to fragmentation functions, etc. However, there is still no real consensus on which of these models are dominant. Several of the same hadronic reactions are being used as probes to elucidate the properties of the quark-gluon plasma created in heavy ion collisions at RHIC and LHC, where nuclear effects have been shown to compete with those due to QGP formation. We will review the recent relevant data from RHIC and the constraints that those place upon theory. We will also discuss upcoming measurements at FNAL, RHIC and LHC that will sample multiple QCD processes with broad kinematic coverage. Those new data should lead us toward the true origin of cold nuclear matter effects and thereby reduce the uncertainties in the extraction of the properties of the QGP. [Preview Abstract] |
Tuesday, November 2, 2010 6:00PM - 6:30PM |
1WC.00007: Extracting the properties of strongly-interacting plasmas from RHIC data Invited Speaker: Spectacular measurements over a decade at the Relativistic Heavy Ion Collider (RHIC) indicate remarkable properties for hot and dense nuclear matter in the temperature range $T \sim 200-400$~MeV. For example, shear viscosity appears to be very low, close to universal ``minimum viscosity'' bounds based on quantum arguments. Moreover, the matter is surprisingly opaque even to heavy quarks. These findings led to the emergence of the strongly-interacting quark-gluon plasma (sQGP) paradigm. In this talk I will review the current status of determination of key bulk matter properties from RHIC heavy-ion data, and discuss remaining theoretical challenges. [Preview Abstract] |
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