Семинар «Теория квантового поля»

Дата и время: среда, 2 марта 2022 г., в 11:00

Место: Онлайн-конференция в Zoom, Лаборатория теоретической физики им. Н. Н. Боголюбова

Тема семинара: «Amplitudes in the Wess-Zumino Model with Quartic Interaction»

Авторы: Л. В. Борк, Д. И. Казаков

Докладчик: Д. И. Казаков

Аннотация:

We analyze the UV divergences for the scattering amplitude in the Wess-Zumino SUSY model with the quartic superpotential. Within the superfield formalizm, we calculate the corresponding Feynman diagrams and evaluate their leading divergences up to 4 loop order of PT. Then we construct recurrence relations that connect the leading UV divergences in subsequent orders of perturbation theory. These recurrence relations allow us to calculate the leading divergences in a pure algebraic way starting from the one loop contribution. We check that the obtained relations correctly reproduce the lower order diagrams evaluated explicitly. At last, we convert the recurrence relations into the RG equations that have integro-differential form. Solving these equations for a particular sequence of diagrams, we find out the high energy behaviour of the amplitude. We then argue that the full amplitude has a similar behaviour with the key feature of the existence of a pole in the s-channel corresponding to a state with a mass ∼ 1/g, where g is the original dimensionfull coupling of the theory. We find out the this state is actually a ghost one similar to the Landau pole in scalar theory.