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<span><span>D<span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;">ear all,</span></span></span>
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<div><span dir="auto"><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;">On Wednesday, August 9th, at 1:00pm EDT, we will have a hybrid</span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;"> </span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;">seminar</span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;"> </span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;">given
by</span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;"> Utku Can</span><span style="font-size: 12pt; font-family: Calibri, Arial, Helvetica, sans-serif; line-height: 1.5; color: black;">
of University of University of Adelaide in the Cebaf room F224-225. For those who won't be able to attend in person, the seminar will also be available on the unique Zoom for Government link: </span><a href="https://jlab-org.zoomgov.com/j/1601080021?pwd=UzB0VmdiRHhRbXVvdHVIVHorR1pWZz09" target="_blank" class="OWAAutoLink">https://jlab-org.zoomgov.com/j/1601080021?pwd=UzB0VmdiRHhRbXVvdHVIVHorR1pWZz09<br>
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</span><span style="font-size: 12pt; color: black;">Please see below for the details.</span></p>
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<b><u><span style="font-size: 12pt; color: black;">Theory Seminar:</span></u></b></p>
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<span style="font-size: 12pt; color: black;">Wednesday August 9</span><span style="font-size: 12pt; color: black;"><sup>th</sup></span><span style="font-size: 12pt; color: black;">, 1pm EDT (F224-F225)</span></p>
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<p style="margin-top: 0px; margin-bottom: 0px; background-color: white;"><span><b><u><span style="font-size: 12pt; color: black;">Speaker</span></u></b><span style="font-size: 12pt; color: black;">:</span></span><span><span style="font-size: 12pt; color: black;">
Utku Can (University of Adelaide)</span></span></p>
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<p style="margin-top: 0px; margin-bottom: 0px; background-color: white;"><span><b><u><span style="font-size: 12pt; color: black;">Title</span></u></b><span style="font-size: 12pt; color: black;">:
</span><span style="color: black;"><span style="font-size: 12pt;">Compton amplitude and the nucleon structure functions from a lattice QCD calculation</span><br>
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<span><b><u><span style="font-size: 12pt; color: black;" class="ContentPasted0">Abstract</span></u></b><span style="font-size: 12pt; color: black;" class="ContentPasted0">:</span></span></span><span style="font-size: 12pt; color: black;">
</span><span style="color: black;"><span style="font-size: 12pt;" class="ContentPasted1">The structure of hadrons relevant for deep-inelastic scattering are completely characterised by the Compton amplitude. The standard approach in structure function calculations
is to utilise the operator product expansion (OPE). However, it is well established in the lattice community that computing higher-twist contributions presents additional challenges that are not easily overcome; complicating the investigations of hadron structure
at a deeper level. Alternatively, it is possible to directly calculate the Compton amplitude by taking advantage of the familiar Feynman-Hellmann approach applied in the context of lattice QCD. By working with the physical amplitude, the intricacies of operator
mixing and renormalisation that plague the OPE approach are circumvented. Additionally, higher-twist contributions become more accessible.</span><span style="font-size:11pt" class="ContentPasted1"><br class="ContentPasted1">
<br class="ContentPasted1">
</span><span style="font-size: 12pt;" class="ContentPasted1">In this talk, I will be highlighting QCDSF/UKQCD Collaboration's recent developments on computing the Compton amplitude. I discuss how to access the Compton amplitude directly via the second-order
Feynman-Hellmann theorem. I will present our nucleon Compton amplitude results for different structure functions across a range of photon momenta. This enables us to study the $Q^2$ dependence of the low moments of the nucleon structure functions in a lattice
calculation. I will also discuss possible further applications of this approach and present some preliminary results.</span><br>
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See you on Wednesday,<br>
Caroline, Patrick & Joe<br>
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