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Dear all, </div>
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<span style="font-size: 11pt;"><br>
</span><span style="font-size: 14.67px;">On Monday, January 27<sup>th</sup>, 2025 at 1:00PM EST,
</span><span style="font-size: 11pt;">we will have a hybrid seminar given by Ignacio Castelli of Temple University,
<b>in person in CC L102</b> and on the following Zoom link: </span></div>
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<a href="https://jlab-org.zoomgov.com/j/1614892873?pwd=bJOPeURjUgP0I792IlslaqaTpK9N7d.1" target="_blank" id="OWA661108b2-16f1-fac0-d9fa-dd2c679058da" class="OWAAutoLink" title="https://jlab-org.zoomgov.com/j/1614892873?pwd=bJOPeURjUgP0I792IlslaqaTpK9N7d.1" rel="noopener noreferrer" data-olk-copy-source="MessageBody" data-linkindex="0" data-auth="NotApplicable" style="margin: 0px;">https://jlab-org.zoomgov.com/j/1614892873?pwd=bJOPeURjUgP0I792IlslaqaTpK9N7d.1</a></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>January 27<sup>th</sup>, 1pm EST (hybrid) </div>
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<b><u>Speaker</u></b>: Ignacio Castelli (Temple University) </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);">Unraveling the Axial Anomaly: Its Role in the ‘Spin Crisis’ and the ‘<i>U<sub>A</sub></i>(1) Problem’</span><span style="color: black;"> </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);">In the Standard Model of particle physics, the axial current is not conserved, due to both fermion masses and the axial anomaly.
In the late 1980s, it was proposed that the axial anomaly could help one understand the results of the European Muon Collaboration (EMC) measurements that led to the nucleon spin crisis. Recent work has taken a fresh look at the role of the axial anomaly in
polarized deep inelastic scattering and extended the discussion to deeply virtual Compton scattering. Important aspects of those works include the apparent connection between the
<i>U<sub>A</sub></i>(1) problem and “anomaly pole,” as well as the dependence of pertinent perturbative results on the infrared regulator. I will discuss these and related topics, and our understanding of the current status of the field.</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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