Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 26: Higgs physics (theory)

T 26.2: Talk

Tuesday, March 16, 2021, 16:15–16:30, Ta

Gauge-invariant description of the Higgs resonance and its phenomenological implications — •René Sondenheimer and Axel Maas — Institute of Physics, NAWI Graz, University of Graz, Universitätsplatz 5, A-8010 Graz, Austria

We investigate the phenomenological consequences of a strict gauge-invariant formulation of the Higgs particle. This requires a description of the observable scalar particle in terms of a bound state structure. Although this seems to be at odds with the common treatment of electroweak particle physics at first glance, the properties of the bound state can be described in a perturbative fashion due to the Fröhlich-Morchio-Strocchi (FMS) framework. In particular a relation between the bound-state Higgs and the elementary Higgs field is obtained within 't Hooft gauges such that the main quantitative properties of the conventional description reappear in leading order of the FMS expansion. In particular the pole structure of the elementary and the bound-state propagator coincide to all orders in a perturbative expansion. However, slight deviations of scattering amplitudes containing off-shell Higgs contributions can be caused by the internal bound state structure which will be discussed.