Theorie-Seminare WS 19/20


Do. 10.10.2019, 16.30 Uhr

J. Thompson (Uni Heidelberg)

(Machine) Learning to be Unsure

Machine learning methods are becoming ubiquitous in particle physics. However, many of these techniques
suffer from overconfidence and a lack of associated uncertainties. In this talk, I will discuss how Bayesian neural networks can address these problems and help us to understand model uncertainties in a machine learning context. In order to do this, I will first explore how these uncertainties can be understood in a frequentist framework, before considering how the Bayesian neural network responds to statistical and systematic uncertainties.


Do. 17.10.2019, 16.30 Uhr

S. Paßehr (RWTH Aachen)

Towards high-precision predictions for Higgs masses and decays in theories beyond the Standard Model

The particle with a mass of about 125GeV that has been discovered at the LHC has properties that, within the current theoretical and experimental uncertainties, leave plenty of room to interpret it as part of an extended Higgs sector in a theory beyond the Standard Model. Supersymmetric models are particularly interesting, since different problems of the Standard Model could be solved at the same time. In such theories, the Higgs mass is a predicted quantity, and in the most popular supersymmetric model, the MSSM, large radiative corrections occur. In order to be competitive with the experimental uncertainty, high-precision predictions are necessary that entail higher-order calculations. In view of feature collider experiments, the endeavor for high-precision predictions should also be extended to the decay widths of Higgs bosons. Apart from the MSSM, only a few other models have received attention. However, especially due to the absence of signs for new physics at the LHC, a model-agnostic approach can be pursued. This leads to generic calculations in general renormalizable theories.
I will discuss recent progress for the prediction of the Higgs-boson spectrum. At first, I will focus on the MSSM, and later I will show the possibilities of generic calculations. Finally, I want to address some properties of higher-order corrections to the decay widths of Higgs bosons.


Do. 24.10.2019, 16.30 Uhr

K. Ng (GRAPPA, Amsterdam)



Do. 31.10.2019, 16.30 Uhr

M. Mühlleitner (KIT)



Do. 07.11.2019, 16.30 Uhr

R. Teyssier (Uni Zürich)



Do. 14.11.2019, 16.30 Uhr

L. Magnea (U. Torino)



Do. 21.11.2019, 16.30 Uhr

M. Bustamante (NBI, Copenhagen)



Do. 05.12.2019, 16.30 Uhr

D.J.E. Marsh (Uni Göttingen)



Do. 12.12.2019, 16.30 Uhr

M. Wiesemann (CERN und MPI München)



Do. 09.01.2020, 16.30 Uhr

A. Fialkov (University of Sussex)



Do. 16.01.2020, 16.30 Uhr

M. Diehl (DESY)



Do. 23.01.2020, 16.30 Uhr

A. Font-Ribera (UC London)



Do. 30.01.2020, 16.30 Uhr

C. Sturm (U. Würzburg)