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 Q05: Effective Field Theory/Lattice QCDInvited Live
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Sponsoring Units: GFB DNP Chair: Emilie Passemar, Indiana University |
Monday, April 19, 2021 10:45AM - 11:21AM Live |
Q05.00001: Nuclear structure and thermodynamics from lattice effective field theory Invited Speaker: Dean Lee I discuss recent progress in calculations of nuclear structure and thermodynamics using chiral effective field theory on the lattice. The talk begins with an introduction covering how nuclear forces are represented on a lattice and how large-scale simulations are done. It then describes calculations of the phase diagram of symmetric nuclear matter and the structure of light and medium-mass nuclei. The talk will feature several new algorithms and methods that make these calculations possible. [Preview Abstract] |
Monday, April 19, 2021 11:21AM - 11:57AM Live |
Q05.00002: Studies for Electro- and Photoproduction Invited Speaker: Astrid Hiller Blin The emergence of nucleon properties from quark and gluon dynamics is a topic that still has many open questions and offers a vast ground for exploration. The discovery of many unexpected new resonance candidates such as the XYZ states and pentaquarks has been challenging the quark model. While high-energy collisions of hadrons and nuclei are a good tool for investigating these topics, they are prone to kinematical effects from hadron decays into the final states. In turn, lepton colliders have been limited by statistics so far: a high-luminosity Electron Ion Collider (EIC) at high energies is called for. In view of the upcoming EIC and JLab experiments, we present sensitivity and feasibility studies for exclusive XYZ photoproduction. We also study polarization observables in pentaquark photoproduction as a means of improving detection sensitivity and tackling the quantum numbers and couplings of these states. Furthermore, the EIC has been mainly designed and will be an excellent tool for electro-production experiments. Therefore, we analyse electron-scattering data to get insight into the inclusive proton structure functions in the resonance region. We use the information from exclusive production channels to systematically isolate resonant from non-resonant contributions, and study the respective $Q^2$ evolutions. Ultimately, this gives insight into the proton PDFs at large $x$ and might further our understanding of quark-hadron duality. [Preview Abstract] |
Monday, April 19, 2021 11:57AM - 12:33PM Live |
Q05.00003: Fundamental Symmetries Using Nucleons and Nuclei Invited Speaker: Emanuele Mereghetti Low-energy tests of fundamental symmetries are extremely sensitive probes of physics beyond the Standard Model, reaching scales that are comparable, if not higher, than directly accessible at the energy frontier. The interpretation of low-energy precision experiments and their connection with models of physics beyond the Standard Model (BSM) relies on controlling the theoretical uncertainties induced by the nonperturbative nature of QCD at low energy and of the nuclear interactions. In this talk, I will focus on two of the most sensitive probes of fundamental symmetries, neutrinoless double beta decay and searches for electric dipole moments (EDMs). After reviewing the physics reach of these experiments, I will discuss recent progress in the theoretical predictions of neutrinoless double beta decay nuclear matrix elements and nucleon and nuclear EDMs. I will then discuss how the interplay of Lattice QCD and nuclear Effective Field Theories is crucial to achieve fully ab initio predictions, with reliable theoretical uncertainties. [Preview Abstract] |
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