[Phys-seminars] 2018-05-07 Particles and Fields Seminar
lublinm
lublinm at bgu.ac.il
Tue May 1 09:36:24 IDT 2018
Particles and Fields Seminar
DATE: 07-05-18
TIME: 14:00
PLACE: Physics building (#54) room 207
TITLE:
Feynman Integrals: symmetries and seagulls
SPEAKER:
Ruth Shir, HUJI
ABSTRACT/COMMENTS:
Feynman diagrams will be looked at from a new point of view. 'Symmetries of Feynman Integrals' is an analytical method for calculating Feynman diagrams. It is based on exposing an underlying group structure of a given diagram which defines a set of partial differential equations in the parameter space of the diagram. Group orbits in the diagramâ€™s parameter space are used to reduce the Feynman integral into a line integral. The vacuum seagull, a three-loop diagram, and the propagator seagull, a propagator-type diagram with two loops, will be used to demonstrate the method, and to obtain new results
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