[Theory-seminars] Theory seminar next week

[Astrid Hiller Blin]

Dear all,

Here is a reminder of next week's theory seminar:

*Theory seminar*
Monday October 19, 1:00 PM

*Andrey Tarasov* (Ohio State University) will talk about "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.

Bluejeans connection: https://bluejeans.com/801786278
<https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_801786278&d=DwMFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=AIMSQQ81YDyrZuJNGks2qw&m=aT_3J5jjiFmHtFXffqbfPqEY_A73NEWw2ebyFyL_eCA&s=YNm3qgT5e8sJgKfZ9vFA_w--imuXwmeAjg0C4AslLwg&e=>

Best wishes,
Astrid, Christos, Filippo
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/theory-seminars/attachments/20201016/cae08f16/attachment.html>