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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jlab-seminars <jlab-seminars-bounces@jlab.org> on behalf of Patricia Cheeseboro via Jlab-seminars <jlab-seminars@jlab.org><br>
<b>Sent:</b> Friday, July 28, 2023 8:10 AM<br>
<b>To:</b> jlab-seminars@jlab.org <jlab-seminars@jlab.org><br>
<b>Subject:</b> [Jlab-seminars] Hall D Seminar</font>
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<p class="x_xxmsonormal" align="center" style="text-align:center"><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Hall D Seminar</span></b></p>
<p class="x_xxmsonormal" align="center" style="text-align:center"><span class="x_xxvalue"><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">Remco De Boer</span></b></span></p>
<p class="x_xxmsonormal" align="center" style="text-align:center"><span class="x_xxvalue"><b><span style="font-size:28.0pt; font-family:"Times New Roman",serif">University of Bochum, Germany</span></b></span></p>
<p class="x_xxmsonormal" align="center" style="text-align:center"><b><span style="font-size:26.0pt; font-family:"Times New Roman",serif">F324-325 Thursday, August 3<sup>rd</sup> @11 am</span></b></p>
<p class="x_xxmsonormal" align="center" style="text-align:center"><i><span style="font-size:20.0pt; font-family:"Times New Roman",serif">The ComPWA Project: Speeding up amplitude analysis with a Computer Algebra System</span></i></p>
<p align="center" style="text-align:center"><b><span style="font-size:18.0pt">Abstract:</span></b></p>
<p class="x_MsoPlainText"><span style="font-size:16.0pt">In the ideal world, we describe our models with recognizable mathematical expressions and directly evaluate those models over large data samples with high performance. It turns out that this can be done
with a CAS, using its symbolic expression trees as template to computational backends from the Machine Learning community, such as JAX. The CAS can in fact further simplify the expression tree, which can result in speed-ups in the numerical back-end.</span></p>
<p class="x_MsoPlainText"><span style="font-size:16.0pt">The ComPWA project uses this principle to formulate large symbolic expressions for amplitude analysis, so that the user has both the flexibility to quickly implement different formalisms, as well can
easily perform fast computations on large data samples. The CAS additionally allows the project to standardize and automatically document these formalisms as they are being implemented.</span></p>
<p class="x_MsoPlainText"><span style="font-size:16.0pt">As an example, we have a look at a recent student by LHCb (arXiv:2301.07010), where symbolic expressions made it possible to quickly compute a polarimeter vector field from Dalitz-plot decomposed (10.1103/PhysRevD.101.034033)
amplitude models.</span></p>
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<p class="x_MsoNormal">Thanks,</p>
<p class="x_MsoNormal">Patricia Cheeseboro</p>
<p class="x_MsoNormal">Admin Support Physics (Hall D)</p>
<p class="x_MsoNormal">Thomas Jefferson National Accelerator Facility</p>
<p class="x_MsoNormal">Jefferson Science Associates, LLC</p>
<p class="x_MsoNormal"><a href="mailto:pcheese@jlab.org">pcheese@jlab.org</a></p>
<p class="x_MsoNormal">(757) 269-5345</p>
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