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 JG: Mini-Symposium on Attacking the Nuclear Force at the EIC I |
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Chair: Pawel Nadel-Turonski, Thomas Jefferson National Accelerator Facility Room: Peralta |
Friday, October 30, 2015 10:30AM - 11:06AM |
JG.00001: Opportunities with Light Ions at an EIC Invited Speaker: Douglas Higinbotham |
Friday, October 30, 2015 11:06AM - 11:18AM |
JG.00002: Studying the Short-Distance Nuclear Force at the EIC Matthew Sievert, Raju Venugopalan, Gerald Miller Exclusive vector meson production measures the gluon distribution of a hadronic target; on a composite system like the deuteron, this gluon distribution carries nonperturbative information about the distribution of nucleons and their interactions. We argue that a novel variation of this process, in which the deuteron breaks up into a back-to-back proton/neutron pair with large transverse momentum, carries new information about the short-distance interactions of nucleons. A perturbative calculation suggests that this information may be factorized and extracted from the experimental measurements, and that such a process could be uniquely accessed by the EIC. If true, this could shed new light on the role of gluons in the short-distance nuclear force, the possibility of ``hidden color'' configurations in nuclear structure, and the competition between quark and gluon exchange in nucleon-nucleon scattering. [Preview Abstract] |
Friday, October 30, 2015 11:18AM - 11:30AM |
JG.00003: Tagging correlations at an EIC Or Hen Results from recent experiments show that short-range interactions between the fermions form correlated, high-momentum, neutron-proton pairs. These pairs dominate the momentum distribution of nucleons above the Fermi momentum of the nucleus. The observed dominance of these Short-Range Correlated (SRC) pairs by neutron-proton pairs shows the dominance of the tensor part of the nucleon-nucleon interaction at short distances. Recent works have shown that the existence and nature of SRC pairs has wide ranging implications for atomic, nuclear and astro physics, including neutrino-nucleus scattering, the EMC effect, the NuTeV anomaly, the nuclear symmetry energy. In this talk I will present the possibility of studying SRC pairs and their partonic structure at an EIC, using the method of spectator tagging in Quasi-elastic and Deep-Inelastic kinematics. We can identify QE or DIS scattering from nucleons in correlated pairs by tagging a spectator nucleon with higher momentum than its initial momentum in the beam. [Preview Abstract] |
Friday, October 30, 2015 11:30AM - 11:42AM |
JG.00004: The Emergence of Hadrons from QCD Color Lamiaa El Fassi The formation of hadrons from energetic quarks, the dynamical enforcement of QCD confinement, is not well understood at a fundamental level. In Deep Inelastic Scattering, modifications of the distributions of identified hadrons emerging from nuclei of different sizes reveal a rich variety of spatial and temporal characteristics of the hadronization process, including its dependence on spin, flavor, energy, and hadron mass and structure. The EIC will feature a wide range of kinematics, allowing a complete investigation of medium-induced gluon bremsstrahlung by the propagating quarks, leading to partonic energy loss. This fundamental process, which is also at the heart of jet quenching in heavy ion collisions, can be studied for light and heavy quarks at the EIC through observables quantifying hadron ``attenuation'' for a variety of hadron species. Transverse momentum broadening of hadrons, which is sensitive to the nuclear gluonic field, will also be accessible, and can be used to test our understanding from pQCD of how this quantity evolves with pathlength, as well as its connection to partonic energy loss. The evolution of the forming hadrons in the medium will shed new light on the dynamical origins of the forces between hadrons, and thus ultimately on the nuclear force. [Preview Abstract] |
Friday, October 30, 2015 11:42AM - 11:54AM |
JG.00005: Gluons at high x in Nuclei at EIC Sergey Furletov, Eugene Chudakov, Douglas Higinbotham, Christian Weiss, Charles Hyde The Electron-Ion Collider (EIC) would enable the first direct measurements of the gluon density in nuclei at x $\agt$ 0.1 using heavy quark production (charm, beauty). Such measurements could answer several outstanding questions regarding the nuclear modifications of the nucleon's quark/gluon structure and provide insight into non-nucleonic degrees of freedom in nuclei and the QCD origin of the nucleon-nucleon interaction. A program to evaluate the feasibility of such measurements will be outlined. The sensitivity of the charm production to the nuclear modification of the gluon density is to be evaluated using Monte-Carlo simulation. The experimental technique for charm reconstruction, which has to be optimized, could influence the design of the EIC detector. [Preview Abstract] |
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