Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session FC: MiniSymposium on Theoretical Approaches to Nucleon Structure 
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Chair: Phiala Shanahan, College of William and Mary Room: Salon 3 
Thursday, October 26, 2017 4:00PM  4:36PM 
FC.00001: Theoretical approaches to nucleon structure Invited Speaker: Christopher Monahan How do quarks and gluons, the basic degrees of freedom of the Standard Model of particle physics, interact to form protons and neutrons, the basic building blocks of most of the visible Universe? In spite of significant progress, the answer to this question is still unclear. Nucleons are stronglycoupled, highly nonlinear systems for which simple perturbative approaches fail and our understanding of their structure is far from complete. I will review recent theoretical approaches to nucleon structure, from both nonperturbative and perturbative quantum chromodynamics (QCD). In particular, I will highlight some recent advances in direct calculations from lattice QCD, in which QCD is formulated on a Euclidean hypercube, and discuss the complementarity and relative strengths of perturbative and lattice techniques. I will finish by providing an overview of various quantities for which lattice calculations and phenomenological results can (potentially) be compared. [Preview Abstract] 
Thursday, October 26, 2017 4:36PM  4:48PM 
FC.00002: First Renormalized Parton Distribution Functions from Lattice QCD HueyWen Lin We present the first latticeQCD results on the nonperturbatively renormalized parton distribution functions (PDFs). Using X.D. Ji's largemomentum effective theory (LaMET) framework, latticeQCD hadron structure calculations are able to overcome the longstanding problem of determining the Bjorken$x$ dependence of PDFs. This has led to numerous additional theoretical works and exciting progress. In this talk, we will address a recent development that implements a step missing from prior latticeQCD calculations: renormalization, its effects on the nucleon matrix elements, and the resultant changes to the calculated distributions. [Preview Abstract] 

FC.00003: ABSTRACT WITHDRAWN 
Thursday, October 26, 2017 5:00PM  5:12PM 
FC.00004: Partonic Orbital Angular Momentum and Lorentz Invariance Relations Abha Rajan , Simonetta Liuti , Michael Engelhardt We show that Generalized Transverse Momentum Distributions (GTMDs) and twist three Generalized Parton Distributions (GPDs) can be connected through Lorentz Invariant Relations. The equations of motion along with the Lorentz Invariance Relations allow one to explicitly write the separate contributions to twist three GPDs from leading twist GPDs, a quark gluon quark correlation term and, in some cases, a mass term. In particular, the GTMD $F_{14}$ or the correlation of an unpolarized quark in a longitudinally polarized proton, is known to describe the quarksâ€™ Orbital Angular Momentum (OAM). In a separate approach, the twist three GPD $\tilde{E}_{2T}$ tilde was also be shown to connect to OAM. We show that these two definitions are connected by a Lorentz Invariance Relation. A similar relation is found for the GTMD $G_{11}$ which describes quark spin orbit correlations in the proton can be connected to the twist three GPDs $E_{2T}'$ and $\tilde{H}_{2T}'$. These relations show how twist three GPDs through an implicit quark gluon interaction reproduce the effects of intrinsic transverse momentum in the GTMDs. [Preview Abstract] 
Thursday, October 26, 2017 5:12PM  5:24PM 
FC.00005: Nuclear Effects in Extraction of Polarized Structure Functions of the Neutron at Large $x$ Dhiraj Maheswari , Misak Sargsian Currently there are active experimental efforts to extract the deep inelastic polarized structure functions of neutron from experiments in which polarized electron scatters off the polarized deuteron or $^3$He target. Special emphasize in these experiments is given to the large Bjorken $x$ region where predictions of different QCD models largely diverge. The extraction of the neutron structure functions at large Bjorken $x$ from nuclear DIS data is very sensitive to nuclear effects due to the correspondence of the large $x$ region to the large internal momenta of bound nucleon in the nucleus. To account for these nuclear effects, we developed a theoretical approach for calculation of nuclear DIS scattering based on lightfront approximation which allows to account for the relativistic effects of bound nucleon motion in the self consistent way. We present the model and the extraction of the polarized neutron DIS structure functions from the existing deuteron and $^3$He data. [Preview Abstract] 
Thursday, October 26, 2017 5:24PM  5:36PM 
FC.00006: Generalized TMDs in Hadronic Collisions Andreas Metz , Shohini Bhattacharya , Jian Zhou Generalized transverse momentum dependent parton distributions (GTMDs) are the most general parton correlation functions of hadrons. For a long time it was not clear if/how GTMDs can be measured. We argue that the exclusive double DrellYan process and $\eta_c$ production in hadronic collisions do give access to GTMDs. We also discuss how specific GTMDs can be measured by means of polarization observables. [Preview Abstract] 
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