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<span style="color:rgb(0, 0, 0);font-family:Calibri, Arial, Helvetica, sans-serif;background-color:rgb(255, 255, 255);display:inline !important">Hello All,</span>
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Tomorrow, June 27th at<span> </span><span style="background-color:rgb(255, 255, 0)">9AM (EDT)</span>, Alec Hannaford-Gunn will give a (virtual) theory seminar on</div>
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<a href="https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09" id="LPNoLPOWALinkPreview" style="color:rgb(0, 120, 212)">https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09</a><br>
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Please see below for the title and abstract of Alec's talk.</div>
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<u><b>Theory Seminar</b></u></div>
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Monday, June 27th at 9:00AM</div>
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<u><b>Alec Hannaford-Gunn</b></u><span> </span>(University of Adelaide)</div>
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will discuss "A lattice QCD calculation of the off-forward Compton amplitude and generalised parton distributions"</div>
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<u><b>Abstract</b></u>:</div>
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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.</div>
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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 $n=2,4$.</div>
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See you tomorrow!</div>
<span style="color:rgb(0, 0, 0);font-family:Calibri, Arial, Helvetica, sans-serif;background-color:rgb(255, 255, 255);display:inline !important">Caroline, Colin & Patrick</span>
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