Bulletin of the American Physical Society
2015 Fall Meeting of the APS Division of Nuclear Physics
Volume 60, Number 13
Wednesday–Saturday, October 28–31, 2015; Santa Fe, New Mexico
Session KG: Mini-Symposium on Attacking the Nuclear Force at the EIC II |
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Chair: Pawel Nadel-Turonski, Thomas Jefferson National Accelerator Facility Room: Peralta |
Friday, October 30, 2015 2:00PM - 2:12PM |
KG.00001: A study of neutron structure with (un)polarized deuterons and forward spectator tagging at EIC Kijun Park An Electron-Ion Collider (EIC) would enable measurements of neutron structure through deep-inelastic electron-deuteron scattering with coincidence tagging of the forward-moving spectator proton. This technique allows to identify the active neutron and control its quantum state in the deuteron through measurement of the recoil proton momentum. An intensive study has established the feasibility of spectator tagging, including measurements of neutron spin structure with a polarized deuteron beam. A Monte Carlo simulation with the GEANT4 modular framework is developed with the physical processes, the MEIC accelerator/detector design and used to optimize the analysis strategy. A technique is implemented for obtaining the free neutron structure function by extrapolating the measured recoil momentum to the on-shell point. Such measurements provide essential information for the flavor separation of the nucleon parton densities, the nucleon spin decomposition, an d precision studies of QCD evolution. The EMC effect in light nuclei can be elucidated by studying the recoil momentum dependence of the nuclear modification away from the on-shell point. In this talk, I describe the proposed experimental set up, analysis procedure, and present results of the neutron structure functions. [Preview Abstract] |
Friday, October 30, 2015 2:12PM - 2:24PM |
KG.00002: The deeply virtual structure of nuclei from inclusive to exclusive processes Simonetta Liuti, Stanley Brodsky, Gerald Miller We discuss several new advancements in our understanding of the deeply virtual structure of nuclei as obtained from both inclusive and exclusive lepton nucleus scattering processes. The latter involve nuclear Generalized Parton Distributions. At low Bjorken $x$, gluon exchange between the outgoing partons and the target spectators affects the structure functions at the leading twist level. The modification of the nuclear structure function with respect to the free nucleon ones observed in experiments is therefore not related to the wave function of the nucleus, but it is due to partonic final state interactions. At larger values of $x$, in the so-called EMC effect region, rescattering can still affect the structure functions although to a lesser extent, as nucleon off-shellness effects become more important. As a result of leading twist partonic reinteractions, the traditional baryon number, momentum, and angular momentum sum rules are expected to be violated in the deep inelastic processes on nuclei which have been measured so far. Additional new information on all of these questions can be obtained through deeply virtual exclusive processes which allow us to access, in particular, transverse spatial configurations of patrons in nuclei. [Preview Abstract] |
Friday, October 30, 2015 2:24PM - 2:36PM |
KG.00003: Extraction of the Light-Cone Momentum Distributions of the Deuteron and their Application to the Analysis of eD Scattering at EIC Werner Boeglin, Misak Sargsian The possibility of having polarized deuteron beams at EIC creates a unique opportunity for studies of different aspects of QCD. These include the partonic structure of the bound neutron, tagged structure functions, the dynamics of final state interaction in DIS etc. However the analysis of DIS processes off the neutron requires a reliable knowledge of the different components of the deuteron's light-cone momentum distribution. We present first results of an extraction of the unpolarized deuteron light-cone momentum distribution from recent high energy and momentum transfer electro-disintegration data. We demonstrate that the high energy nature of the reaction allows a clear separation of the longitudinal and transverse dynamics of the scattering processes allowing an access to the light-cone momentum distribution of the deuteron which is minimally influenced by final state interaction effects. We also discuss the prospects of extracting the light-cone momentum distribution functions for tensor and vector polarized deuteron targets and their use in the analysis of DIS processes at EIC. [Preview Abstract] |
Friday, October 30, 2015 2:36PM - 2:48PM |
KG.00004: Polarized Electron - Polarized Deuteron Deep-Inelastic Scattering in Electron-Ion Collider with Tagging Misak Sargsian, Wim Cosyn, Christian Weiss For the past several years there have been an intensive research and development for the possible electron-ion collider that will be able to probe deep inelastic processes at unprecedentedly high energies in eA channel. One of the important advantages of the collider kinematics in DIS processes is the possibility for an unambiguous separation of hadrons emerging from DIS and hadrons fragmenting from the target nucleus. This creates a unique possibility for tagging the interacting nucleon with the recoil slow fragments in the DIS process. The situation is most clean for the deuteron target in which case the recoil particle is a nucleon. In addition, the possibility of having polarized deuteron beams will create unprecedented opportunities in probing polarization degrees of freedom for parton distributions in the interacting bound nucleon. In this work we develop a theoretical framework for the polarized electron-polarized deuteron deep inelastic scattering in which the recoil nucleon is detected in the target fragmentation region. Two main contributions for which theoretical models are developed are the plane-wave impulse approximation, in which no reinteractions are taking place between the final state products of DIS and the recoil nucleon. [Preview Abstract] |
Friday, October 30, 2015 2:48PM - 3:00PM |
KG.00005: Forward Tracking with the JLab/MEIC Detector Concept Charles Hyde At a future electron ion collider (EIC), the quark-gluon structure of the NN force can be probed in $e.g.$ deeply virtual exclusive scattering on a tensor polarized Deuteron and diffractive DIS on the deuteron with tagging of the NN final state. The MEIC design includes two Interaction Points (IPs), each of which can operate simultaneously at full luminosity. The detector and beam-line optics for IP1 are designed to be nearly hermetic for all particles outside the presumed 10-sigma admittance (longitudinal and transverse) of the figure-8 accelerator lattice. The integration of the IP1 detector with the lattice extends ~40 m downstream of the IP in both the electron and ion directions. The central region of the detector is a new 4 m long 3 m diameter 3 Tesla solenoid. Analysis in the forward ion direction is enhanced by the 50 mrad crossing angle at the IP, and a two-stage spectrometer integrated into the first 36 m of the accelerator lattice. In this talk I will present the optics and resolution of the forward ion spectrometer, including resolution effects of an initial beam pipe design. [Preview Abstract] |
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