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Project A - Precise measurements with Higgs particles

Determination of coupling strengths, investigation of coupling structures, determination of CP properties, interpretation of data in models with extended Higgs sectors

S. Dittmaier, K. Jakobs, H. Rzehak, M. Schumacher, J. J. van der Bij, C. Weiser 

 

Subjects for PhD theses

 

A.1 Higgs precision physics in effective field theories

 

  • Precise predictions for the production and decays of Higgs bosons in effective theories (Dittmaier, van der Bij) 

    A PhD thesis in theoretical particle physics will be dedicated to precise predictions for the production and decays of Higgs bosons in the effective field theory that extends the Standard Model by SU(3)xSU(2)xU(1)-symmetric operators up to dimension six. Here the most challenging aspect will be the treatment of quantum corrections in the framework of the non-renormalizable effective field theory. A major goal will be the corresponding extensions of the Monte Carlo programs HAWK and PROPHECY4F, which among other things comprise state-of-the-art implementations of electroweak corrections.

 

  • Fit of anomalous couplings in experimental analyses of the channels (Jakobs, Schumacher, Weiser)

    Several PhD theses will be devoted to the analyses H→WW, H→ττ, H→bb(bar) and H→ γγ at higher centre-of-mass energies, adapted and optimised to the new experimental environment (pile-up, signal to background ratio). The goal is a precise determination of the signal strenghts of the different production and decay processes. Furthermore, the structure and strength of so-called effective coupling terms is to be extracted based on observed event yields and distributions of kinematic variables in these finbal states.
    For these studies the event selections have to be adapted. Suitable observables showing sensitivity to specific coupling terms have to be determined and their dependence on experimental and theoretical uncertainties as well as the expected signal-to-background ratio should be investigated. One PhD thesis will specifically focus on CP violating coupling contributions by making use of so-called "Optimal Variables".

 

A.2 Higgs physics in extensions of the Standard Model

 

  • Precise predictions for the production and decays of Higgs bosons in extensions of the Standard Model (Dittmaier, Rzehak, van der Bij)

    PhD theses in particle theory will focus on precise predictions for the production and decays of Higgs bosons in extensions of the Standard Model, with the goal of providing Monte Carlo event generators for experimental analyses. In particular, we will consider extended models with Higgs singlets, Higgs doublets, and Higgs triplets. In detail, PhD projects will be dedicated to further extensions of the Monte Carlo programs HAWK and PROPHECY4F.
     
  • Experimental analyses of allowed parameter regions in extended models of electroweak symmetry breaking (Jakobs, Schumacher, Weiser)

    Several PhD theses will be devoted to the experimental analysis of extensions of the Standard Model which are consistent with the observed Higgs particle and other searches for additional Higgs particles. Models with extended Higgs sectors predict new signatures, like e.g. 'invisible' decays or decays of a heavy Higgs particle into lighter ones. The focus of these theses will be on the search for such decays.

 

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