Contribution to a conference proceedings/Contribution to a book

FZJ-2023-00630

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quark spin-orbit correlations in the proton

Engelhardt, M. (Corresponding author) ; Green, J. ; Hasan, N. ; Izubuchi, T. ; Kallidonis, C. ; Krieg, S.FZJ* ; Liuti, S. ; Meinel, S. ; Negele, J. ; Pochinsky, A. ; Rajan, A. ; Silvi, G.FZJ* ; Syritsyn, S.

2022
Sissa Medialab Trieste, Italy

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Please use a persistent id in citations: http://hdl.handle.net/2128/33602  doi:10.22323/1.396.0413

Abstract: Generalized transverse momentum-dependent parton distributions (GTMDs) provide a comprehensive framework for imaging the internal structure of the proton. In particular, by encoding the simultaneous distribution of quark transverse positions and momenta, they allow one to directly access longitudinal quark orbital angular momentum, and, moreover, to correlate it with the quark helicity. The relevant GTMD is evaluated through a lattice calculation of a proton matrix element of a quark bilocal operator (the separation in which is Fourier conjugate to the quark momentum)featuring a momentum transfer (which is Fourier conjugate to the quark position), as well as the Dirac structure appropriate for capturing the quark helicity. The weighting by quark transverse position requires a derivative with respect to momentum transfer, which is obtained in unbiasedfashion using a direct derivative method. The lattice calculation is performed directly at the physical pion mass, using domain wall fermions to mitigate operator mixing effects. Both the Jaffe-Manohar as well as the Ji quark spin-orbit correlations are extracted, yielding evidence for a strong quark spin-orbit coupling in the proton.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)

Appears in the scientific report 2022

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