[Theory-seminars] Theory Seminar Monday (9am) - Alec Hannaford-Gunn

[Colin Egerer]

Hello All,

This coming Monday, June 27th at 9AM (EDT), Alec Hannaford-Gunn will give a (virtual) theory seminar on
https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09

Please see below for the title and abstract of Alec's talk.

Theory Seminar
Monday, June 27th at 9:00AM

Alec Hannaford-Gunn (University of Adelaide)
will discuss "A lattice QCD calculation of the off-forward Compton amplitude and generalised parton distributions"

Abstract:
Generalised 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 behaviour.

I will give an overview 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 $-t\in[0.3, 2.2]\;\text{GeV}^2$. 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 $A_{n,0}(t)$ and $B_{n,0}(t)$ for $n=2,4$.


Have a pleasant weekend!
Caroline, Colin & Patrick
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