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<font size="3" class="">Dear All, </font>
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<div class=""><font size="3" class="">Here is a reminder for the seminar tomorrow. T<span style="color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);" class="">he summer students will be giving 15 minute talks. </span></font></div>
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<font size="3" class=""><span style="margin: 0px;" class=""><u class=""><b class="">Cake seminar:</b></u></span><br class="">
<span style="margin: 0px;" class="">Monday, July 29, 1:00PM, Room F113</span></font></div>
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<div class=""><font color="#0056d6" size="3" class=""><span style="white-space: pre-wrap;" class="">Marston Copeland, "</span><span style="white-space: pre-wrap;" class="">Self-energies in a relativistic chiral effective theory"</span></font></div>
<div class=""><font size="3" class=""><span style="white-space: pre-wrap;" class=""><u class="">Abstract:</u></span><span style="white-space: pre-wrap;" class="">
</span><span style="white-space: pre-wrap;" class="">We calculate the </span><span style="white-space: pre-wrap;" class="">self-energies of the flavor SU(3) octet and decuplet baryons, using a relativistic chiral effective theory framework consistent with Lorentz
and </span><span style="white-space: pre-wrap;" class="">gauge invariance. The results are compared using several different regularization prescriptions, including finite-range regularization, Pauli-Villars, and dimensional regularization, which are shown
to yield the same leading nonanalytic behaviors in the chiral limit, as expected in QCD. Using the same chiral effective theory, the
</span><span style="white-space: pre-wrap;" class="">self-energy corrections to the baryon masses can also be computed.</span></font></div>
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<div style="margin: 0px; background-color: rgb(255, 255, 255);" class=""><font size="3" class=""><font color="#0056d6" class=""><span style="white-space: pre-wrap;" class="">L</span><span style="white-space: pre-wrap;" class="">uisa Velasco,
</span><span style="white-space: pre-wrap;" class="">“</span></font><a style="white-space: pre-wrap;" class=""><font color="#0056d6" class="">Improving the Particle Multiplicity Generator Model for the Empirically Trained Hadronic Event Regenerator</font><span style="color: rgb(0, 0, 0);" class="">"</span></a><br class="">
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<a style="margin: 0px;" class=""><font size="3" class=""><span style="margin: 0px; color: rgb(0, 0, 0);" class=""><u class="">Abstract:</u></span><span style="margin: 0px; color: black;" class=""><br class="">
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<a style="margin: 0px;" class=""><span style="margin: 0px; color: rgb(0, 0, 0);" class=""><font size="3" class="">Particle collision event generators are extremely useful, providing synthetic data quickly and to the user’s specifications. At present, all such
event generators function via underlying theory that provides rules by which particle multiplicities and momenta are generated. To remove theory dependence, the Empirically Trained Hadronic Event Regenerator (ETHER) at Jefferson Lab implements machine learning
models to be trained on experimental data. The focus of this study is to improve the performance of the particle multiplicity generator and develop the implementation of a non-trivial conditional feature. An ensemble learning meta-algorithm is implemented
to refine the model’s learning ability. The base model is altered to accept a conditional label and is trained on continuous and discrete encoded labels. We find that the model's ability to learn rare events can be augmented through ensemble training, but
it struggles to learn the shifts in the underlying data distribution necessary for the successful implementation of a conditional feature. Preliminary results suggest that many more training steps are required to implement a conditional feature in the generator
model.</font></span></a></div>
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<div style="margin: 0px; background-color: rgb(255, 255, 255);" class=""><font size="3" class=""><font color="#0056d6" class=""><span style="white-space: pre-wrap;" class="">Jake Bringewatt, “Confronting lattice parton densities with global QCD analysis"</span></font><br class="">
<a style="color: rgb(32, 31, 30); white-space: pre-wrap; margin: 0px;" class=""><span style="margin: 0px; color: rgb(0, 0, 0);" class=""><u class="">Abstract:</u></span></a><br class="">
<span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">Recent progress in lattice QCD simulations of parton
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">quasi-distributions is paving the way towards the study of the</span><span style="color: rgb(32, 31, 30); white-space: pre-wrap;" class=""><br class="">
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">momentum dependence of PDFs from first principles. We are working on a
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">combined global QCD analysis of inclusive deep-inelastic scattering,
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">Drell-Yan and other high-energy scattering data with recent results
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">from lattice calculations of the u − d PDFs in the proton. In this
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">talk I present our initial fits for unpolarized and polarized PDFs and</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">discuss how the lattice results match with
phenomenological </span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">determinations of PDF parameters. I also analyze how these results may
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">indicate which regions of parton fraction in the lattice data induce
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">constraints on the anti-down − anti-up PDF difference in the proton.</span></font><span style="color: rgb(32, 31, 30); font-family: Calibri, Helvetica, sans-serif; font-size: 11pt; white-space: pre-wrap;" class=""><br class="">
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<div style="margin: 0px; background-color: rgb(255, 255, 255);" class=""><font size="3" class=""><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">Thank you.</span></font></div>
<div style="margin: 0px; background-color: rgb(255, 255, 255);" class=""><font size="3" class=""><span style="color: rgb(0, 0, 0); white-space: pre-wrap;" class="">-Carlota, Miguel & Raza</span></font></div>
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