Bulletin of the American Physical Society
2019 Fall Meeting of the APS Division of Nuclear Physics
Volume 64, Number 12
Monday–Thursday, October 14–17, 2019; Crystal City, Virginia
Session FE: Mini-Symposium: Towards a US Electron Ion Collider: Physics, Accelerator, and Detectors II |
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Chair: Douglas Higinbotham, Thomas Jefferson National Accelerator Facility Room: Salon 5 |
Tuesday, October 15, 2019 10:30AM - 10:42AM |
FE.00001: The gluonic radii of light nuclei; A threshold coherent electroproduction measurement of upsilon at and EIC Zein-Eddine Meziani, Whitney Armstrong, Ian Cloet, Adam Freese, Sylvester Joosten, Tsung-Shung Lee The fully exclusive elastic electroproduction of $\Upsilon$ on the proton, deuteron, $^3$He and $^4$He at an EIC is a powerful tool to extract their gluonic radii and examine the contribution of the trace anomaly to their mass. Only at energies and luminosity planned for a future US-based EIC that one can contemplate these challenging measurements to reach these goals. The full exclusivity of the process as well as the access of large $Q^2$ and low $t$ in the threshold region should allow to address both the reaction mechanism of electroproduction of $\Upsilon$ as well as the multiple gluonic exchange between the probe and the target in a region of virtual-photon target invariant mass ranging from a perturbative to a non-perturbative regime. We will discuss the motivation of such measurements and show projections of achievable precision in the determination of these gluonic radii using the TOPSiDE detector concept. [Preview Abstract] |
Tuesday, October 15, 2019 10:42AM - 10:54AM |
FE.00002: Imaging quarks and gluons at an Electron-Ion Collider Markus Diefenthaler Transverse momentum dependent (TMD) distributions are a novel QCD tool that allow the mapping of the motion of quarks and gluons in nuclear matter. The Electron-Ion Collider will allow for a high-precision study of TMDs at the scale of sea quarks and gluons. In my presentation, I will discuss the requirements on theory as well as on accelerator, detector, and computer technology for the TMD program. [Preview Abstract] |
Tuesday, October 15, 2019 10:54AM - 11:06AM |
FE.00003: Detailed Study of Event Reconstruction for electron-nucleus Collisions at an EIC Barak Schmookler The electron-nucleus (and electron-proton) inclusive scattering cross section is a function of the center-of-mass energy, $\sqrt{s}$, and of two kinematic variables. Therefore, an accurate reconstruction of the event kinematics is vital at a future electron-ion collider. Various methods for reconstructing the event kinematics have been developed for electron-proton collisions. For neutral-current processes, the kinematics can be reconstructed using either the scattered electron, the final-state hadronic system, or a combination of both. For charged-current scattering, reconstruction relies on the hadronic system. The accuracy of a given reconstruction method depends non-trivially on the kinematic regime under study, detector acceptance and resolution effects, and the size of radiative processes. In this talk, we will show new detailed simulation studies of kinematic reconstruction for electron-nucleus collisions at an EIC. These simulations reconstruct the products of e-A Monte Carlo generators using possible EIC detectors with various acceptance and resolution characteristics. Furthermore, we will describe novel methods that we have developed to extend the kinematic reconstruction techniques created for electron-proton scattering to the case of electron-nucleus scattering. [Preview Abstract] |
Tuesday, October 15, 2019 11:06AM - 11:18AM |
FE.00004: Machine learning methods for predictions in the future Electron-Ion Collider M.P. Kuchera, Y. Alanazi, M. Almaeen, M. Houck, T. Liu, E. McClellan, W. Melnitchouck, E. Pritchard, R. Ramanujan, M. Robertson, N. Sato, R R. Strauss, E. Tsitinidi, L. Velasco, Y. Li We report on the development of machine learning tools to allow fast and accurate predictions for phenomena at the femtometer scale. There are two primary goals of this work: {\bf (1)} Build a universal Monte Carlo event generator (MCEG). For this we implement generative adversarial networks (GANs). We train on experimental data to develop a model-independent event generator that mimics the full final state for a given reaction. In the first stage, we have trained on synthetic data on electron-proton scattering created by the Pythia MCEG, and have developed a one- and two-stage GAN that provides realistic deep-inelastic scattering spectra. {\bf (2)} Map between experimental observables and theoretical parameters. For this we use a mixture density network (MDN) that allows us to create faithful mappings between experimental data and the underlying quantum probability distributions that describe nucleon structure. This approach represents a new paradigm for QCD global analysis, which will provide valuable tools for theorists as well as for experimentalists in the design of future experiments. [Preview Abstract] |
Tuesday, October 15, 2019 11:18AM - 11:30AM |
FE.00005: Rare isotopes at the EIC. Pawel Nadel-Turonski Electron scattering on light- and heavy nuclei to measure is a cornerstone of the Electron-Ion Collider (EIC). However, Deep-Inelastic Scattering (DIS) on a nucleus also produces a wide range of nuclear fragments - some of which are, for instance, close to the neutron drip line. With the appropriate near-beam detection capabilities, an EIC can thus support a program complementary to planned for the Facility for Rare Isotope Beams (FRIB). In addition to providing a cross check using a very different technique, the lifetime of short-lived isotopes produced at the EIC would be longer in the lab frame (by a factor of 100), which could facilitate some measurements. A rare isotope program at the EIC could be carried out in parallel with other measurements, and the ion detection would also benefit key EIC measurements, such as probing the nuclear glue through coherent diffractive processes. This talk will give a first look at the opportunities and requirements for rare isotopes at the EIC. [Preview Abstract] |
Tuesday, October 15, 2019 11:30AM - 11:42AM |
FE.00006: New heavy flavor program for the future Electron Ion Collider} Xuan Li The proposed high luminosity high energy Electron Ion Collider (EIC) will explore the proton/nuclear structure, search for gluon saturation and precisely determine the nuclear parton distribution functions (nPDFs) in a wide x-$Q^{2}$ phase space. Heavy flavor measurements at the future EIC will allow us to directly study the nPDFs, the quark/gluon fragmentation processes and energy loss in the nuclear medium within the poorly constrained high Bjorken-x region. We propose to develop a new physics program to study the flavor tagged hadrons/jets, heavy flavor hadron-jet correlations and flavor dependent jet fragmentation processes in the nucleon/nucleus going direction (forward region) at the EIC. The proposed measurements will provide a unique path to explore the flavor dependent fragmentation functions and energy loss in heavy nuclei, which can constrain the initial state effects for previous and ongoing heavy ion measurements at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). To realize these measurements, detector R$\&$D and detector design are needed. Details of the proposed physics program and progress on the simulation studies will be discussed in this presentation. [Preview Abstract] |
Tuesday, October 15, 2019 11:42AM - 11:54AM |
FE.00007: Heavy-quark energy-loss measurements at the Electron-Ion Collider Yue Shi Lai Electron-nucleus collisions at the Electron-Ion Collider (EIC) will provide a new mean to precisely measure the space-time evolution of energetic quarks as they traverse the nuclear medium. Such measurements will complement results from RHIC and the LHC on energetic quarks passing through a hot quark-gluon plasma. Heavy-quark energy-loss measurements will require the ability to observe the decay vertex of the hadrons containing the heavy-quarks, and to distinguish it from the collision vertex. The performance for several candidate EIC detector designs is presented, including one with an all-silicon particle tracker. The potential of using deep neural networks for these measurements is discussed. [Preview Abstract] |
Tuesday, October 15, 2019 11:54AM - 12:06PM |
FE.00008: Prospects for EIC-driven advances in HEP phenomenology and Lattice QCD Timothy Hobbs, Bo-Ting Wang, Pavel Nadolsky, Fredrick Olness As typified by the recent report of the National Academies, the goal of constructing a high-luminosity electron-ion collider (EIC) is crucial to the future of nuclear and hadronic physics. This machine will dramatically enhance our knowledge of a wide array of phenomena at work in QCD bound states by providing a comprehensive mapping of the internal tomography of hadrons, including the proton and lighter mesons. While these explorations of hadron structure will extend to transverse momentum-dependent observables, in this talk I focus on the prospects for an EIC to sharpen our understanding of the proton's unpolarized parton distribution functions (PDFs) and the resulting implications for high-energy phenomenology. Modern information on nucleon PDFs arise from many experiments covering vast reaches of kinematical parameter space; I will place the EIC within this larger context and illustrate its ability to provide durable constraints. In addition, I will also highlight the potential of the future EIC program to serve as the basis for a powerful synergy between studies of hadron tomography and lattice QCD calculations. [Preview Abstract] |
Tuesday, October 15, 2019 12:06PM - 12:18PM |
FE.00009: Search for Charged Lepton Flavor Violation at the US Electron-Ion Collider Jin Huang, Abhay Deshpande, Jinlong Zhang, Krishna Kumar, Yuxiang Zhao Discovery of neutrino oscillations (demonstrating lepton-flavor violation in neutral leptons) begs a question of profound importance: is there flavor violation in charged leptons as well? Within the Standard Model, conservation laws are typically associated with certain symmetries. No such symmetries are identified for charged lepton flavor violation and yet, no experimental evidence for the Charged Lepton Flavor Violation (CLFV) has been found to date. Searches for physics beyond the Standard Model leading to CLFV possible in future facilities is hence of fundamental importance and high interest. The proposed high-energy Electron-Ion Collider (EIC) with its unprecedented high luminosity will provide a unique opportunity for such a search. We will present results from an ongoing study of sensitivities possible for $e \rightarrow \tau$ conversion in e-p scattering with the luminosities and center-of-mass energies being proposed at the future US EIC. [Preview Abstract] |
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