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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0); background-color:rgb(255,255,255)"><span style="background-color:rgb(255,255,255); font-family:Calibri,Helvetica,sans-serif">Hello All,</span></span>
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<span style="font-family:Calibri,Helvetica,sans-serif">Tomorrow, February 7th at 1:00PM (EST),
</span><span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif">Martha Constantinou</span><span style="font-family:Calibri,Helvetica,sans-serif"> will give a (virtual) theory seminar on:
</span><a href="https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09" target="_blank" rel="noopener noreferrer"><span style="font-family:Calibri,Helvetica,sans-serif">https://jlab-org.zoomgov.com/j/1611179843?pwd=M09CNTFpbFVZSW1IQlhIMGp3RUVHUT09</span></a><br>
<div style="background-color:rgb(255,255,255)"><span style="font-family:Calibri,Helvetica,sans-serif">Please see below for the title and abstract of
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<div style="background-color:rgb(255,255,255)"><b><span style="font-family:Calibri,Helvetica,sans-serif"><u>Theory Seminar</u></span></b></div>
<div style="background-color:rgb(255,255,255)"><span style="font-family:Calibri,Helvetica,sans-serif">Monday, February 7th at 1:00PM</span></div>
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<span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif"><u><b>Martha Constantinou</b></u> (Temple University)</span></div>
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<span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif">will speak about
</span><span class="x_field-content"><span style="color:black; font-family:Calibri,Helvetica,sans-serif">"Pion and kaon structure from Mellin moments of PDFs and GPDs</span></span><span class="x_field-content" style="font-family:Calibri,Helvetica,sans-serif">"</span><span class="x_field-content"><br>
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<div style="background-color:rgb(255,255,255)"><u><b><span style="font-family:Calibri,Helvetica,sans-serif">Abstract:</span></b></u></div>
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<span style="color:black; font-family:Calibri,Helvetica,sans-serif">Pions and kaons play an important role in understanding QCD dynamics, and the interplay between the emergent hadronic mass and the Higgs mechanisms. Kaons are particularly interesting because
of the valence strange quark, which has a larger mass than the up</span><span style="color:black; font-family:Calibri,Helvetica,sans-serif"><i> </i></span><span style="color:black; font-family:Calibri,Helvetica,sans-serif">and down</span><span style="color:black; font-family:Calibri,Helvetica,sans-serif"><i> </i></span><span style="color:black; font-family:Calibri,Helvetica,sans-serif">quarks
that form the pions. Due to the presence of a valence strange quark in the kaon, a comparison between pion and kaon observables provides a unique window into SU(3) flavor breaking effects. Such effects have already been observed in the pion and kaon. </span></p>
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<span style="color:black; font-family:Calibri,Helvetica,sans-serif">While the proton has been extensively studied in lattice QCD, there are limited studies on the pion and kaon structure. Given the relatively small number of experimental data, it is crucial
to obtain results from first principles. In this talk, we present a direct lattice QCD calculation of the first three non-trivial Mellin moments of PDFs for the pion and kaon. We also present results for the scalar, vector and tensor form factors. We use one
ensemble of Nf=2+1+1 gauge configurations of maximally twisted mass fermions improved with a clover term. The ensemble corresponds to a pion mass of about 260 MeV and a kaon mass of about 530 MeV. We study excited-states contamination in detail using several
values of the source-sink time separation within the range of 1.12 - 2.23fm. We use operators that are free of mixing and apply a multiplicative renormalization function calculated non-perturbatively. </span></p>
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<span style="color:black; font-size:12pt; font-family:Calibri,Helvetica,sans-serif">One important aspect of our analysis is the reconstruction of the x-dependence of the pion and kaon PDFs using the Mellin moments calculated in this work. We find that the reconstruction
is feasible, and we draw qualitative conclusions on the large-x behavior. The PDF reconstruction also allows the extraction of higher moments with reasonable statistical errors. A highlight of the calculation on the form factors is the extraction of the lowest
moment of the densities of transversely polarized quarks in the impact parameter space.</span></p>
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<div style="background-color:rgb(255,255,255)"><span style="font-family:Calibri,Helvetica,sans-serif">See you tomorrow!</span></div>
<span style="background-color:rgb(255,255,255); font-family:Calibri,Helvetica,sans-serif">Caroline, Colin & Patrick</span></div>
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