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9th Workshop of the APS Topical Group on Hadronic Physics

Apr 13 – 16, 2021
US/Eastern timezone

Session

New approaches to PDFs at and beyond Leading Twist

Apr 13, 2021, 3:30 PM

Conveners

New approaches to PDFs at and beyond Leading Twist

  • Timothy Hobbs (Southern Methodist University)

Description

co-host: Lamiaa El Fassi

Presentation materials

There are no materials yet.

  1. 71. Gluon pseudo-distributions at short distances: Forward case
    Wayne Morris (Old Dominion University)
    4/13/21, 3:30 PM
    Oral Presentation

    We present the results that are necessary in the ongoing lattice calculations of the gluon parton distribution functions (PDFs) within the pseudo-PDF approach. We give a classification of possible two-gluon correlator functions and identify those that contain the invariant amplitude determining the gluon PDF in the light-cone $z^2\to0$ limit. One-loop calculations have been performed in the...

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  2. 169. Parton Pseudo-Distributions From Lattice QCD via Distillation
    Colin Egerer (William and Mary)
    4/13/21, 3:50 PM
    Oral Presentation

    The pseudo-distribution formalism is one such lattice methodology capable of extracting light-cone distributions from matrix elements of suitably constructed Euclidean non-local operators of a spacelike extent. Leveraging the distillation spatial smearing program, we extract the unpolarized isovector valence quark PDF of the nucleon via a direct 1-loop matching of the computed Ioffe-time...

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  3. 182. Lorentz invariance relation anomalies and intrinsic parton transverse momentum
    Fatma Aslan (Jefferson Lab)
    4/13/21, 4:10 PM
    Oral Presentation

    We investigate the so-called Lorentz invariance relations from the standpoint of the proper definitions of partonic correlations functions resulting from factorization; that is in light the proper treatment of ultraviolet divergences. We show that there are corrections to the naive Lorentz invariance relations are nontrivial even in very simple renormalizable quantum field theories. We also...

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  4. 174. Testing the limits of collinear factorization with a diquark spectator model
    Alberto Accardi (Hampton U. and Jefferson Lab)
    4/13/21, 4:30 PM
    Oral Presentation

    We revisit the derivation of collinear factorization for Deep Inelastic Scattering to more faithfully represent the partonic kinematic at sub-asymptotic energy than possible in the conventional approach. We verify the validity of the obtained factorization formula by considering a diquark spectator model designed to reproduce the main features of electron-proton scattering at large $x_B$ in...

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  5. 137. Non-trivialities in the Matching for the twist-3 PDFs
    Shohini Bhattacharya (Temple University)
    4/13/21, 4:50 PM
    Oral Presentation

    The quasi-PDF approach, proposed by Ji in 2013, is at the forefront of numerical calculation of partonic structure of strongly interacting systems from lattice QCD. This approach relies on the extraction of matrix elements of space-like operators for fast-moving hadrons. Such auxiliary quantities can be related to the light-cone PDFs through a perturbatively calculable matching coefficient. We...

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  6. 138. The x-dependence of twist-3 PDFs from lattice QCD
    Aurora Scapellato (Temple University)
    4/13/21, 5:10 PM
    Oral Presentation

    Parton distribution functions (PDFs) are important quantities in hadron physics, quantifying the momentum distribution of quarks and gluons inside hadrons. In this talk, we present a lattice QCD calculation of twist-3 $g_T(x)$ and $h_L(x)$ PDFs of the proton, that are of great interest in phenomenology, as they encode new information on quark-gluon-quark correlations, accessible experimentally...

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