Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session G11: Mini-symposium: Multidimensional Structure of Hadrons IMini-Symposium Recordings Available
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Sponsoring Units: DNP Chair: William Detmold, MIT Room: Majestic |
Sunday, April 10, 2022 8:30AM - 9:06AM |
G11.00001: Exploring the 3D Nucleon Structure Invited Speaker: Stefan Diehl
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Sunday, April 10, 2022 9:06AM - 9:18AM |
G11.00002: Visualization of the Proton I Richard G Milner, Rolf Ent The understanding of proton structure is largely based on lepton scattering data interpreted in a boosted reference frame along the direction of the virtual photon. Ongoing and future research offers exciting, new possibilities to explore nucleon and nuclear structure in the direction transverse to the boost, and offers the prospect of a more complete multi-dimensional picture of the proton's inner quark-gluon structure. A team of physicists, film-producers and an animator has developed new animations to visualize our current understanding of the quark and gluon structure of the proton. An 18.5 min video has been prepared to introduce these animations to the physics community. Over two contributed talks, the video will be presented and shown. |
Sunday, April 10, 2022 9:18AM - 9:30AM |
G11.00003: Visualization of the Proton II Rolf Ent, Richard G Milner The understanding of proton structure is largely based on lepton scattering data interpreted in a boosted reference frame along the direction of the virtual photon. Ongoing and future research offers exciting, new possibilities to explore nucleon and nuclear structure in the direction transverse to the boost, and offers the prospect of a more complete multi-dimensional picture of the proton's inner quark-gluon structure. A team of physicists, film-producers, and an animator has developed new animations to visualize our current understanding of the quark and gluon structure of the proton. An 18.5 min video has been prepared to introduce these animations to the physics community. Over two contributed talks, the video will be presented and shown. |
Sunday, April 10, 2022 9:30AM - 9:42AM |
G11.00004: Mechanical Properties of the Proton Latifa Elouadrhiri Protons and neutrons are composed of elementary objects, quarksand gluons. The latter are the carrier of the strong force that governs the dynamics binding quarks and gluons together. It is well established that quarks do not exist in isolation but only in the confines of nucleons and mesons(hadrons) of finite size. Although the proton is an absolutely stable particle, the distribution of forces between the quarks in theproton,whichareresponsibleforthatstabilityarelargelyunknown. |
Sunday, April 10, 2022 9:42AM - 9:54AM |
G11.00005: Momentum-Current Gravitational Multipoles of Hadrons Yizhuang Liu, Xiangdong Ji We study multipole expansion of the momentum currents in hadrons, with three series S^{(J)}S(J), \tilde T^{(J)}T~(J), and T^{(J)}T(J), in connection with the gravitational fields generated nearby. The momentum currents are related to their energy-momentum form factors, which in principle can be probed through processes like deeply-virtual Compton scattering currently studied at JLab 12 GeV facility and future Electron Ion Collider. We define the leading momentum-current multipoles, tensor monopole \tauτ (T0T0) and scalar quadrupole \hat \sigma^{ij}σ^ij (S2S2) moments, relating the former to the so-called DD-term in the literature. We calculate the momentum current distribution in hydrogen atom and its monopole moment in the basic unit of \tau_0 =\hbar^2/4Mτ0=ℏ2/4M, showing that the sign of DD-term has little to do with mechanical stability. The momentum current distribution also strongly modifies the static gravitational field inside hadrons. |
Sunday, April 10, 2022 9:54AM - 10:06AM |
G11.00006: Generalized Parton Distribution of Nucleon at Physical Pion Mass from Lattice QCD Huey-Wen Lin The generalized parton distributions (GPDs) offer a window on three-dimensional imaging of the nucleon, providing understanding of how the fundamental properties of the nucleon, such as its mass and spin, arise from the underlying quark and gluon degrees of freedom. In this work, we present the first lattice calculation of the nucleon unpolarized and polarized GPDs at physical pion mass, using an $a \approx 0.09$~fm lattice ensemble with 2+1+1 flavors of highly improved staggered quarks (HISQ) generated by MILC Collaboration. We perform the GPD calculation in Breit frame using averaged nucleon boost momentum $P_z \approx 2.2$~GeV with nonzero momentum transfers in $[0.2,1.0]\text{ GeV}^2$. The three-dimensional distribution of the nucleon as functions of $x$ and $Q^2$ is presented, along with the three-dimensional nucleon tomography and impact-parameter--dependent distribution. |
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