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Dear all, </div>
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</span><span style="font-size: 14.67px;">On Monday, </span><span style="font-size: 11pt;">March</span><span style="font-size: 14.67px;"> 10<sup>th</sup>, 2025 at 1:00PM EDT,
</span><span style="font-size: 11pt;">we will have a hybrid seminar given by Yuchuan Feng of George Washington University,
<b>in person in CC L102</b> and on the following Zoom link: </span></div>
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<span style="background-color: rgb(255, 255, 255);"><a href="https://jlab-org.zoomgov.com/j/1605519910?pwd=gw9JbktkW2md9FsFnxDJfvFbd3eUl6.1" target="_blank" id="LPlnk" class="OWAAutoLink" title="https://jlab-org.zoomgov.com/j/1605519910?pwd=gw9JbktkW2md9FsFnxDJfvFbd3eUl6.1" rel="noopener noreferrer" data-olk-copy-source="MessageBody" data-linkindex="0" data-auth="NotApplicable" style="margin: 0px; background-color: rgb(255, 255, 255); text-align: left;">https://jlab-org.zoomgov.com/j/1605519910?pwd=gw9JbktkW2md9FsFnxDJfvFbd3eUl6.1</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>March 10<sup>th</sup>, 1pm EDT (hybrid) </div>
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<b><u>Speaker</u></b>: Yuchuan Feng (George Washington University) </div>
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<b><u>Title</u></b>:<b> </b><span style="background-color: white;">Progress in Coupled-Channel Three-Body Scattering</span> </div>
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<span style="color: black;"><b><u>Abstract</u></b>: </span><span style="color: rgb(32, 32, 32); background-color: rgb(255, 255, 255); line-height: 1.284;">Including three-body dynamics above threshold is required for the reliable extraction of many amplitudes
and resonances from experiment and lattice QCD. The <i>S</i>-matrix principle of unitarity can be used to construct amplitudes for three-particle scattering, rearranging two-body subsystems by particle exchange. Our work presents a unitary coupled-channel
method that includes pions and kaons, evaluated for the example of the <i>a</i><sub>1</sub>(1260) system. The model contains two-body
<i>S</i>- and <i>P</i>-wave subsystems (isobars) of all isospins. We evaluate and compare the production amplitudes for physical momenta with traditional isobar lineshapes to show coupled-channel and rescattering effects.</span><span style="color: black;"> </span></div>
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See you on Monday. </div>
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Best regards, </div>
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Joe, Zheng-Yang, and Gloria</div>
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