Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session FA: Mini-Symposium on EIC Physics |
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Chair: Peter Jacobs, Lawrence Berkeley National Laboratory Room: 62 |
Thursday, October 27, 2011 4:00PM - 4:36PM |
FA.00001: The Electron-Ion Collider: Tackling QCD from the Inside (of Nucleons and Nuclei) Out Invited Speaker: Christine Aidala After the development of quantum chromodynamics in the last quarter of the 20th century, the 21st century as it extends before us holds great promise for reaching a new era in understanding QCD's rich complexities, in particular confinement and asymptotic freedom. While there will be more than one front along which to advance our understanding, a key experimental facility, capable of colliding beams of electrons with a wide range of nuclei as well as polarized protons and light ions, has been proposed. This versatile facility will for example allow us to perform precision spatial and momentum mapping of the structure of the nucleons and nuclei of everyday matter, study the physics of strong color fields in nuclei, explore in detail the effects of soft scales on hard partonic processes, and confront the question of the transition from scattered quarks and gluons to final-state hadrons observable in the laboratory. An overview of the proposed Electron-Ion Collider will be presented. [Preview Abstract] |
Thursday, October 27, 2011 4:36PM - 4:48PM |
FA.00002: Quark and Gluon Imaging with Meson Electroproduction at an EIC Tanja Horn Hadrons in QCD are relativistic many-body systems with a fluctuating number of elementary quark and gluon constituents. With the 12 GeV energy upgrade at Jefferson Lab we will probe the valence quark structure of these strongly interacting systems. Beyond the valence quark region, the nucleon is expected to contain a ``sea'' of quark-antiquark pairs. The Electron-Ion Collider (EIC) as a frontier QCD facility would for the first time provide the kinematic reach and precision to study the fundamental structure of matter by directly probing the sea quarks and the virtual force carriers of QCD, the gluons. Information on the sea quarks and gluon structure is obtained from exclusive scattering. Measurements of, for instance, $J/\Psi$ photo/electroproduction would allow for mapping the transverse spatial distribution of gluons in the nucleon, including the unexplored ``valence-like'' gluons. Production of light mesons with charge/isospin would map the transverse distributions of sea quarks and provide additional insight into their dynamical origin. In this talk I will discuss the exciting prospects of studying the transverse spatial landscape of nucleon structure using production of various vector and pseudoscalar exclusive channels. [Preview Abstract] |
Thursday, October 27, 2011 4:48PM - 5:00PM |
FA.00003: The EIC: Precision tool to explore \& understand the role of gluons in QCD Abhay Deshpande While it is known for a decades that QCD is the correct theory that describes Strong Interactions, our understanding of the role of the gluons in QCD still remains largely unknown at extreme low and high energy, where large number of gluons (and quarks) interact with each other coherently. The high energy, polarized Electron Ion Collider (EIC) will provide a unique opportunity to systematically study and understand this as no other machine will. I will summarize the physics goals of the EIC, and present the status of the project, including anticipated steps needed to realize the project in the US. [Preview Abstract] |
Thursday, October 27, 2011 5:00PM - 5:12PM |
FA.00004: e+A physics at an Electron-Ion Collider Liang Zheng The probing of nuclei via deep-inelastic and diffractive processes in the high-energy (low-x) regime will open a new precision window for the investigation of the gluonic structure of matter. Studies of e+p collisions at HERA and especially d+Au collisions at RHIC have found tantalizing hints of saturated gluon densities, a phenomenon with substantial impact on the physics of heavy-ion collisions. With well controlled kinematics and a reduced source of background compared to d+Au, deep inelastic scattering on nuclear targets (e+A) at an Electron-Ion Collider (EIC) would allow one for the first time to precisely explore the collective behavior of densely packed gluons deep into the saturation regime. Being sensitive to the gluon distribution, di-hadron correlations provide a key measurement to study saturation. In this talk, I am going to discuss the capabilities of the proposed EIC at Brookhaven National Lab with a special emphasis on the aspirations of di-hadron correlation measurements in e+A collisions. [Preview Abstract] |
Thursday, October 27, 2011 5:12PM - 5:24PM |
FA.00005: High Luminosity Electron-Hadron Collider eRHIC Nicholaos Tsoupas The design of future high-energy high-luminosity electron-hadron collider at RHIC called eRHIC is presented. The design employs two energy recovery linacs (ERL's) to accelerate the electron beam bunches to 20 (potentially 30) GeV and to collide these electron bunches with the circulating hadrons bunches in RHIC. After the collision the electron bunches will be decelerated by the two ERL linacs down to 10 MeV and dumped to a target. The center-of-mass energy of eRHIC will range from 30 to 200 GeV. The luminosity exceeding 10$^{34 }$cm$^{-2 }$s$^{-1}$ can be achieved in eRHIC using the low-beta interaction region (IR) with a 10 mrad beam crossing. The (IR) will utilize 5 mrad crab cavities for both the hadrons and the electron bunches. The important eRHIC R{\&}D items include: a) the high-current polarized electron source, b) the coherent electron cooling and c) the compact magnets for recirculating passes. We will present a staging scenario of step-by-step, increase of the electron beam energy to the top energy of 30 GeV, by building-up the eRHIC's SRF linacs. [Preview Abstract] |
Thursday, October 27, 2011 5:24PM - 5:36PM |
FA.00006: Status Report on the Tungsten Powder/Fiber Calorimetry Program for EIC Jay Dunkelberger We report the current status of an EIC detector R{\&}D project for a new sampling calorimeter technology using tungsten powder and scintillating fibers. Detector construction techniques and bench test results will be presented. We will show results of Geant4 simulations for a proposed tungsten-fiber calorimeter envisioned for both a STAR forward calorimeter upgrade and an electromagnetic calorimeter for EIC with emphasis on the performance characteristics of the detector (energy and position resolution, pi0-gamma separation and e/h rejection, pi0 reconstruction etc.). Finally, future plans for our R{\&}D effort will be discussed. [Preview Abstract] |
Thursday, October 27, 2011 5:36PM - 5:48PM |
FA.00007: Physics Opportunities with STAR in the EIC Era Ernst Sichtermann A future high-energy polarized Electron-Ion Collider (EIC) would enable precision measurements of the partonic structure of nucleons and nuclei, yielding unique insights in the momentum, spin, and spatial substructure of nucleons and nuclei. An upgrade of the Relativistic Heavy Ion Collider, RHIC, at Brookhaven National Laboratory (BNL) with a high-intensity electron beam in stages with increasing electron beam energies is one several possibilities worldwide that are being investigated to realize an EIC. Its concept allows, with suitable redesign of the interaction regions, collisions at the existing RHIC experiments. Selected physics opportunities with, limitations of, and upgrade paths for the STAR experiment at RHIC in the early stages of such an EIC will be discussed. [Preview Abstract] |
Thursday, October 27, 2011 5:48PM - 6:00PM |
FA.00008: The extraction of the $F_2$ and $F_L$ structure functions from inclusive e+p and e+A scatterings at the EIC Ramiro Debbe Among the many measurements projected to study the nucleon and nuclei structure at the eRHIC, the extraction of the longitudinal structure function $F_L$ stands prominently. This is so because this measurement provides a unique tool to study the gluon distribution in the nucleus and nuclei and allows to test saturation effects in gluons at low x and low Q$^2$. In prepraration for these measurements, simulations are being performed to estimate the effects of detector resolution, radiative corrections and the presence of systemetic uncertainties which in turn determine the quality of extracted physics. The extraction of the F$_L$ structure function will be done from a combination of inclusive measurements at different electron beam energies each with at least three values of the hadron beam energy. The selected electron and hadron beam energies will allow the extraction of the F$_L$ and F$_2$ structure functions down to x values of 10$^{-4}$ and the virtuality of the exchanged photon Q$^2$, ranging from 1 to 1000 GeV/c$^2$. The kinematic coverage of these measurements as well as the effects of the detector resoltution and systematic uncertainties on both F$_L$ and F$_2$ will be discussed. [Preview Abstract] |
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