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Greetings everyone,</div>
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I apologize for the typo in the previous email giving 9pm EDT as the time for today's seminar, as well as for the botched formatting. Note that the seminar takes place at
<b>9 am EDT</b>. A corrected reminder is appended below.</div>
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Today, Monday, March</span><span style="font-size: 14.67px; color: black;"> 31<sup>th</sup>, 2025 at
<b>9:00AM</b> </span><span style="font-size: 14.67px; color: rgb(0, 0, 0);">EDT</span><span style="font-size: 14.67px; color: black;">,
</span><span style="font-size: 11pt; color: black;">we will have a virtual seminar given by Archana Radhakrishnan of Tata Institute of Fundamental Research 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/1614062845?pwd=ZJ2oGOHp0vj9ipvRgYrKzY0epX8vpQ.1" target="_blank" id="OWAe4e6e475-71f1-12ff-b6e3-5b8c84c65428" class="x_OWAAutoLink" title="https://jlab-org.zoomgov.com/j/1614062845?pwd=ZJ2oGOHp0vj9ipvRgYrKzY0epX8vpQ.1" rel="noopener noreferrer" style="margin: 0px; background-color: rgb(255, 255, 255); text-align: left;" data-linkindex="0" data-olk-copy-source="MessageBody" data-auth="NotApplicable" data-ogsc="" data-ogsb="rgb(255, 255, 255)">https://jlab-org.zoomgov.com/j/1614062845?pwd=ZJ2oGOHp0vj9ipvRgYrKzY0epX8vpQ.1</a></span></div>
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<span style="background-color: rgb(255, 255, 255);">Although it’s not an in-person seminar, you can also join your colleagues for a remote streaming of the seminar in CEBAF Center F324-325.</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 31<sup>th</sup>, <b>9am</b> EDT (virtual) </div>
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<b><u>Speaker</u></b>: Archana Radhakrishnan (TIFR) </div>
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<span style="color: black;"><b><u>Title</u></b>:<b> </b></span><span style="color: rgb(32, 32, 32); background-color: rgb(255, 255, 255);">Exotic
<i>T<sub>bc</sub></i> Tetraquarks From Lattice QCD</span><span style="color: black;"> </span></div>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 11pt; color: black;"><b><u>Abstract</u></b>:
</span><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(32, 32, 32); background-color: rgb(255, 255, 255); line-height: 1.284;">Research into doubly heavy tetraquarks has become highly relevant, especially with the recent
discovery of the doubly charmed tetraquark <i>T<sub>cc</sub></i>. In this talk, we present a lattice investigation of S-wave
<img style="width: 34px; height: 15px; max-width: 1249px; margin: 0px;" data-file-id="6242679" data-ogsc="" width="34" height="15" src="https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/68bd07e5-38e3-b8e2-a61d-73c26bc128e5.png"> scattering within the
isoscalar axial-vector and scalar channels. Both processes feature the flavor combination
<img style="width: 30px; height: 14px; max-width: 1249px; margin: 0px;" data-file-id="6242680" data-ogsc="" width="30" height="14" src="https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/42a20a7a-4df7-f155-28b9-2b5bdbafab8f.png">, which could potentially
host tetraquarks. </span></p>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 11pt; color: rgb(32, 32, 32); background-color: rgb(255, 255, 255); line-height: 1.284;">Our calculations were conducted on four different
<i>N<sub>f</sub></i> = 2+1 MILC gauge ensembles, each with varying lattice spacings and volumes. Utilizing the amplitude analysis method by Lüscher, we extracted the scattering amplitudes from the finite-volume spectra. We examine the light quark mass (<img style="width: 30px; height: 14px; max-width: 1249px; margin: 0px;" data-file-id="6242681" data-ogsc="" width="30" height="14" src="https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/62748273-defd-1612-f99f-98f8554d25bc.png">)
dependence of these amplitudes and extrapolate the amplitudes to the continuum. Our findings provide evidence for a bound state of the
<img style="width: 30px; height: 14px; max-width: 1249px; margin: 0px;" data-file-id="6242680" data-ogsc="" width="30" height="14" src="https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/42a20a7a-4df7-f155-28b9-2b5bdbafab8f.png"> tetraquark at the physical quark
mass (<img style="width: 30px; height: 14px; max-width: 1249px; margin: 0px;" data-file-id="6242681" data-ogsc="" width="30" height="14" src="https://mcusercontent.com/1de9c43e6d5e45ff0ecd664cd/images/62748273-defd-1612-f99f-98f8554d25bc.png">) point within
both the scalar and the axial-vector channels.</span></p>
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See you all today!</div>
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Kind regards, </div>
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<span style="background-color: white;">Joe, Zheng-Yang, Gloria and Adam</span></div>
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