Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H15: Partonic Structure of NucleiLive
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Sponsoring Units: GHP Chair: Ian Cloet, Argonne National Laboratory |
Sunday, April 18, 2021 10:45AM - 10:57AM Live |
H15.00001: Exploring Free and Bound Nucleon Structure Using Deuteron DIS with Spectator Tagging at the EIC Alexander Jentsch, Zhoudunming Tu, Christian Weiss Measurements of DIS on the deuteron with detection of the spectator nucleon in the final state (spectator tagging) represent a unique method for extracting the free neutron structure functions and studying the nuclear modifications of bound nucleons. The detection of the spectator nucleon (with typical momenta $\sim$ 100 MeV/c in the deuteron rest frame) fixes the nuclear configuration during the DIS process and permits differential studies of the nuclear modifications. In electron + deuteron measurements at the EIC the spectator nucleon moves forward with $\sim$1/2 the beam momentum and can be detected using detectors in the so-called ``far-forward” region ($\eta > 4.5$). We study the feasibility of tagged DIS measurements with the baseline EIC far-forward detector design using realistic detector simulations for both proton and neutron detection. We then use the smeared data to study the extraction of the free neutron structure through on-shell extrapolation in the spectator proton momentum and the characterization of bound nucleon structure with tagging at the EIC. [Preview Abstract] |
Sunday, April 18, 2021 10:57AM - 11:09AM Live |
H15.00002: Event Reconstruction for Diffractive Scattering at the Electron-Ion Collider Athira Vijayakumar, Barak Schmookler Diffractive Deep Inelastic Scattering – a colorless exchange between the target nucleus and the incoming electron that manifests in a rapidity gap in the detector– is sensitive to the geometric structure of hadrons, and hence can be used as a probe for exploring the mystery of confinement and saturation. We will discuss the complementary event kinematic reconstruction methods for exclusive diffractive events and assess their impact on the physics studied in various kinematic regimes. For the simulation studies, a comparison of Pythia and Sartre event generators was done comparing with HERA data for e-p elastic J/$\psi$ production. As Sartre shows promising agreements to HERA data, the output is passed to a fast simulation package (eicsmear) as well as a full forward spectrometer simulation (EicRoot) to perform the kinematics reconstruction. Pythia generated background studies aided in parametrizing the far forward components such as ZDCs that are crucial in differentiating the elastic from breakup events. Additionally, we will describe how we incorporated the dependence of the angular distribution of the vector meson decay products on the polarization of the virtual photon in DVMP processes, in Sartre. [Preview Abstract] |
Sunday, April 18, 2021 11:09AM - 11:21AM Live |
H15.00003: Current status of studies on parton energy loss in cold nuclear matter at SeaQuest. Marshall Scott, Arun Tadepalli Parton energy loss in cold nuclear matter is integral to the understanding of interaction of partons with the nuclear medium. By measuring the nuclear modification, $R_{pA}$, Drell-Yan serves as a clean probe into initial state energy loss due initial state quark-medium interactions and color singlet final state. E906/SeaQuest, a is fixed target Drell-Yan experiment, uses the 120 GeV ($\sqrt{s_{NN}}=15$ GeV) Main Injector Beam at Fermilab to study the interaction of protons impinging on LH$_2$, LD$_2$, C, Fe, and W targets. SeaQuest is uniquely suited to measure this energy loss as the spectrometer acceptance is optimized in the high $x_2$ range, which minimizes other potential nuclear effects such as nuclear shadowing, and the lower beam energy increases the relative Drell-Yan yield to the charmonium backgrounds. We present recent progress toward this measurement. [Preview Abstract] |
Sunday, April 18, 2021 11:21AM - 11:33AM Live |
H15.00004: Machine learning methods for extracting structure functions from experimental data Andrew Hoyle, Michelle Kuchera, Pawel Ambrozewicz, Oguzhan \c{C}\H{o}lkesen, Astrid Hiller-Blin, Yaohang Li, Wally Melnitchouk, Zach Nussbaum, Raghu Ramanujan, Nobuo Sato Machine learning methods are used to extract structure functions from experimental deep-inelastic scattering cross section data with uncertainty predictions, without the need for explicit parameterizations for the structure functions. Structure functions are predicted without direct supervision, with learning models trained using explicit supervision on cross sections directly. Results from generative adversarial networks and deep regression models will be presented, and predictions with uncertainties from different methods compared. [Preview Abstract] |
Sunday, April 18, 2021 11:33AM - 11:45AM Live |
H15.00005: EMC Ratios for Light Nuclei Abishek Karki A part of JLab experiment E12-10-008 was completed in the Spring of 2018, measuring inclusive electron scattering from a range of nuclei to extract their nuclear structure function. Data was acquired on Be, 10B, 11B, and C nuclei. We aim to extract the ratio of the nuclear structure function to deuterium in order to study the EMC effect and help test the idea that the local nuclear density plays an important role in quark modification in the nuclear medium. In this talk, we will present preliminary results and the current status of the analysis.This work is supported by US Department of Energy, Office of Science under Award Number DE-FG02-07ER41528. [Preview Abstract] |
Sunday, April 18, 2021 11:45AM - 11:57AM Live |
H15.00006: Application of Generative Adverserial Networks to electron-proton scattering Pawel Ambrozewicz, Yasir Alanazi, Michelle Kuchera, Yaohang Li, Tianbo Liu, Evan McClellan, Wally Melnitchouk, Eric Pritchard, Raghu Ramanujan, Michael Robertson, Nobuo Sato, Richard Strausse, Luisa Velasco Generative Adverserial Networks (GANs) are used to faithfully generate final state particle phase space in electron-proton scattering. Using GANs allows to build a Monte Carlo event generator free of theoretical assumptions. The architecture of the employed GAN will be discussed and generation results will be presented. [Preview Abstract] |
Sunday, April 18, 2021 11:57AM - 12:09PM Live |
H15.00007: Cross Section Measurement of Associated $W^{\pm} + J/\psi$ Production in $pp$ Collisions at $\sqrt{s}=$ 13 TeV With the ATLAS Detector Charles Burton The cross-sections of prompt and non-prompt production of $W^{\pm} + J/\psi$ are being measured by the ATLAS Collaboration using the full 13 TeV LHC Run II $pp$ collision data set. The prompt production of associated $J/\psi$ with a $W^{\pm}$, where both particles are produced in a single parton-parton interaction, provides constraints on models of non-relativistic quantum chromodynamics, especially in the realm of heavy quarkonia production. Additionally, this process can occur in double-parton scattering (DPS) interactions, and that measurement offers a clear test of DPS models. In this analysis, we emphasize the ability to separate the single-parton and double-parton production modes, in order to better understand each one. Finally, the non-prompt measurement allows for the study of top production and b-quark fragmentation. [Preview Abstract] |
Sunday, April 18, 2021 12:09PM - 12:21PM Live |
H15.00008: Solutions to Three-Body Integral Equations Md Habib E Islam, Andrew W. Jackura, Ra\'ul A. Brice\~no, Sebastian M. Dawid, Connor McCarty Understanding three body dynamics is important in modern hadron spectroscopy since many resonances strongly decay into three particles. Lattice QCD can provide a systematic way to study such systems, which connects short-distance interactions to scattering amplitudes through a set of integral equations. In this talk, we present a study of numerical solutions for these integral equations in a case where two of the particles form a bound state. We show a method for extrapolating the discrete approximation of these equations to their continuum limit. This study completes the toolset to determine three body interactions from lattice QCD. [Preview Abstract] |
Sunday, April 18, 2021 12:21PM - 12:33PM Live |
H15.00009: Impact of Coulomb Corrections on Measurement of the EMC Effect David Gaskell Experiment E03-103 at Jefferson Lab made measurements of the EMC Effect for several light and heavy nuclei. At the relatively low energies of these measurements (5.8 GeV) effects due to the acceleration of the incident and scattered electrons due to the Coulomb field of heavy nuclei can be significant. This talk will focus of the impact of Coulomb Corrections, not only on the E03-103 results, but on earlier data from the SLAC E140 experiment as well. In particular, the application of Coulomb Corrections results in an apparent $\epsilon$ dependence of the target ratios, implying a possible nuclear dependence of $R=\frac{\sigma_L}{\sigma_T}$ at large $x$. [Preview Abstract] |
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