Theory Seminar: Alec Hannaford-Gunn

  • Theory Seminar: Alec Hannaford-Gunn
    https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09
    Remote
    2022-06-27EDT9:00:00 ~ 2022-06-27EDT10:00:00
    17022
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Speaker: Alec Hannaford-Gunn (University of Adelaide)

Title: A lattice QCD calculation of the off-forward Compton amplitude and generalised parton distributions

Abstract: Generalized parton distributions (GPDs) are observables that provide a unique window into hadron structure, including the spatial distribution of hadron constituents and their spin decomposition. Despite their importance, GPDs remain elusive: they are difficult to determine experimentally, and lattice QCD calculations have provided only limited constraints on their behavior. I will give an overview of a novel method to determine GPD properties in lattice QCD currently being implemented by the CSSM/QCDSF collaboration. We have extended Feynman-Hellmann methods—previously used to calculate the forward Compton amplitude—to determine the off-forward Compton amplitude for soft momentum transfer in the range -t ∈[0.3, 2.2]GeV2. As with the physical scattering amplitude, our lattice Compton amplitude is dominated by GPD contributions at high energies. Therefore, I will also present our efforts to constrain GPD properties from this calculation, especially our determination of the GPD moments An,0(t) and Bn,0(t) for n=2,4.


Event Date
-
Location
Remote
Category
Scientific Program
Seminars
Contact Name
Patrick Barry
Phone
(708) 612-0198