24–27 Sept 2019
DESY Hamburg
Europe/Berlin timezone

Asymptotically Safe Extensions of the MSSM

25 Sept 2019, 14:25
25m
Seminar room 1 (DESY Hamburg)

Seminar room 1

DESY Hamburg

Speaker

Mr Kevin Moch (TU Dortmund)

Description

Despite its many successes the Standard Model can at best be viewed as a low energy approximation to a more fundamental theory of nature. Supersymmetry provides a theoretically attractive extension of the Standard Model while the idea of asymptotic safety leads to field theories which can be regarded as being fundamental. In this talk I investigate whether and how the minimal supersymmetric version of the Standard model can be extended in a way such that it becomes asymptotically safe without including gravity. Implications for the field content and on the scale of susy breaking are discussed.

Summary

Recent model building has provided ways to extend the SM into one which features
asymptotic safety.
Here we pursued the question whether the MSSM can also be extended in such a way.
After providing guiding rules regarding the existence of weakly interacting non-gaussian fixed points in supersymmetric models in general and in the MSSM in particular, we discuss the phenomenology of such fixed points. The guiding rules set an upper limit to additional colored particles beyond the MSSM in order to obtain non-gaussian fixed points of the RG flow.
We present searches for AS MSSM extensions which yield some candidates. All of them have in common a matching scale onto the SM of order $\sim$ 1 GeV which makes them phenomenologically not viable.
Using non-perturbative exact relations of superconformal field theories we conclude that the AS candidates may exist beyond perturbation theory.
More work can be done in the search for extensions of the MSSM having UV attractive fixed points. Investigating extensions at higher loop order, extending the gauge group and the possibility of strongly interacting fixed points could all lead to a variety of new asymptotically safe extensions of the MSSM.

Primary authors

Prof. Daniel Litim (University of Sussex) Prof. Gudrun Hiller (TU Dortmund) Mr Kevin Moch (TU Dortmund)

Presentation materials