[Theory-seminars] Theory seminar on Monday Oct. 19th

[Christos Kallidonis]

Dear all,

Tomorrow we will have a Theory Seminar starting at 13:00.

Please see below for the details:

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Bluejeans connection: https://bluejeans.com/801786278
Date and time: Monday October 19th, 13:00 EDT
Speaker: Andrey Tarasov (Ohio State University)
Title: The role of the axial anomaly in polarized deep inelastic scattering
Abstract: I’ll discuss the role of the chiral anomaly in deeply inelastic scattering (DIS) of electrons off polarized protons employing a worldline formalism, which is a powerful framework for the computation of perturbative multi-leg Feynman amplitudes. I’ll demonstrate how the triangle anomaly appears at high energies in the DIS box diagram for the polarized structure function g_1(x_B,Q^2) in both the Bjorken limit of large Q^2 and in the Regge limit of small x_B. I’ll show that the operator product expansion is not required to extract the anomaly in either asymptotics, and the infrared pole in the anomaly arises in both limits. The leading contribution to g_1, in both Bjorken and Regge asymptotics, is therefore given by the expectation value of the topological charge density.
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See you all there!

Best regards,
Astrid, Christos, Filippo
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