Институт теоретической и математической физики

МГУ имени М.В. Ломоносова

ITMP Seminar "Exact off-shell Sudakov form factor in N=4 SYM"

ITMP Seminar
24 октября 2022

Dear Colleagues,

We are pleased to announce that the next ITMP seminar will be held on Wednesday, Oct 26, 18:00 (Moscow time). The seminar will be organized in person in room г-725, ITMP with the possibility to join via zoom.

Speaker: Dr. Leonid Bork, ITEP, Moscow

Title: Exact off-shell Sudakov form factor in N=4 SYM

Abstract: We consider the Sudakov form factor in N=4 SYM in the off-shell kinematical regime, which can be achieved by considering the theory on its Coulomb branch. We demonstrate that up two three loops both the infrared-divergent as well as the finite terms do exponentiate, with the coefficient accompanying log’s of mass determined by the octagon anomalous dimension Γ_oct. This behaviour is in strike contrast to previous conjectural accounts in the literature. Together with the finite terms we observe that up to three loops the logarithm of the Sudakov form factor is identical to twice the logarithm of the null octagon O_0, which was recently introduced within the context of integrability-based approaches to four point correlation functions with infinitely-large R-charges. The null octagon O_0 is known in a closed form for all values of the 't Hooft coupling constant and kinematical parameters. We conjecture that the relation between O_0 and the off-shell Sudakov form factor will hold to all loop orders.

If you want to join the seminar please register here before 16:00, October 26 here.

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