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SS19 – Abstract
Alex Maas
(Universität Graz)
4.7.2019
Electroweak phenomenology from (fundamental) field theory (PRETALK for students at 15:30 h)
Manifest gauge-invariance requires that observable states in the standard-model are described by composite operators, which involve additional Higgs contributions beyond perturbation theory. This field-theoretical effects has been confirmed in lattice simulations. It has experimentally accessible consequences. In the standard model, these will be, e.g., a non-trivial modification of the off-shell formfactor of the weak vector bosons, effectively increasing the apparent radius. Results of lattice measurements will be presented, which give an estimate of the size of the effect. The other example is an additional Higgs contribution to the structure of the proton. (Differential) measurements of pp->ttbar(Z) are used together with HERWIG and CMS analysis setups to constrain this contribution. It is found that a sizable effect is still compatible with the currently available data. Finally, this can lead to qualitative changes in signatures for extensions of the standard model. This will be highlighted in a simplified setup.
