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Dear all, </div>
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On Monday, June 24<sup>th</sup>, 2024 at 1pm EDT, we will have a virtual seminar given by Dennis Bollweg of Brookhaven National Lab on the Zoom for Government link: </div>
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<span style="background-color: rgb(255, 255, 255);"><a href="https://jlab-org.zoomgov.com/j/1607531692?pwd=eWJ1Wm13bE5FQXpoM0xRc3VuM2l4UT09" target="_blank" id="OWAa0f923da-c437-18b6-c968-7955d88932a7" class="OWAAutoLink" rel="noopener noreferrer" data-auth="NotApplicable" data-linkindex="0" style="margin: 0px; background-color: rgb(255, 255, 255); text-align: left;">https://jlab-org.zoomgov.com/j/1607531692?pwd=eWJ1Wm13bE5FQXpoM0xRc3VuM2l4UT09</a></span></div>
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Please see below for the title and abstract. </div>
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<b><u>Theory Seminar</u></b>:<b> </b>June 24<sup>th</sup>, 1pm EDT (virtual) </div>
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<b><u>Speaker</u></b>: Dennis Bollweg (Brookhaven National Lab) </div>
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<b><u>Title</u></b>:<b> </b>Lattice QCD determination of the Collins-Soper Kernel from chiral quarks at physical masses </div>
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<b><u>Abstract</u></b>: In this talk, I will present our lattice QCD calculation of the rapidity anomalous dimension of transverse-momentum-dependent distributions (TMDs), i.e. the Collins-Soper kernel, via the recently proposed Coulomb-gauge-fixed quasi-TMD
formalism. </div>
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This unitary lattice calculation is conducted using the domain wall fermion discretization scheme with a fine lattice spacing of about 0.08 fm and physical values for the light and strange quark masses. We determine the Collin-Soper kernel by analyzing the
ratios of pion quasi-TMD wave functions at next-to-leading logarithmic perturbative accuracy. The Coulomb-gauge-fixed quasi-TMDWF demonstrates a significantly slower signal decay with increasing quark separations due to the absence of Wilson lines, allowing
us to access the non-perturbative CS kernel up to transverse separations of 1 fm. I will compare our results with perturbative predictions at small transverse separations as well as phenomenological parametrizations of experimental data. </div>
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See you on Monday. </div>
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Best regards, </div>
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Caroline, Joe, Zheng-Yang, and Gloria</div>
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