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<div class="">Dear all,</div>
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<div class="">Tomorrow we will have a theory seminar, please see below for details:</div>
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<div class="">Bluejeans connection: <a href="https://bluejeans.com/801786278" class="">https://bluejeans.com/801786278</a></div>
<div class="">Date and time: Monday <span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: AvenirNext-Regular;" class="">Feb. 22, 2021,</span><font color="#000000" style="font-family: AvenirNext-Regular;" class=""> 1:00 PM</font></div>
<div class="">Speaker: Ian Moult (SLAC)</div>
<div class="">Title: <span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: AvenirNext-Regular;" class="">Jet Substructure, Lightray Operators and Spinning Gluons</span></div>
<div class="">Abstract: The detailed internal structure of jets encodes valuable information about the interactions of high energy quarks and gluons, and their confinement into color-neutral hadrons. Theoretically, the flow of energy within jets is characterized
by non-local lightray operators, which measure the distribution of energy at null infinity in collider experiments. In this talk I will first use Open Data to show that matrix elements of multiple lightray operators can be directly measured in collider experiments,
leading to a new perspective on jet substructure. I will then show that techniques developed in the study of conformal field theories, in particular the lightray operator product expansion (OPE), provide powerful approaches to understanding the small angle
behavior of these observables. Finally, I will highlight an interesting transverse spin effect that arises due to the quantum mechanical interference of intermediate gluons of different helicities, and imprints an azimuthal modulation pattern onto the energy
deposited in a detector.</div>
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<div class="">See you all there!</div>
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<div class="">Best regards,</div>
<div class="">Astrid, Christos, Filippo</div>
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