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### 18.04.2018 (Wednesday)

#### Feynman Integrals: symmetries and seagulls

Regular Seminar Ruth Shir (Hebrew University of Jerusalem)

 at: 16:00 QMWroom G O Jones 610 abstract: 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 diagram’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.