Speaker
Dr.
Axel Maas
(University of Jena)
Description
The Higgs sector of the standard model, the Higgs and the W/Z bosons, is a quite peculiar theory. Because of the Higgs effect, for some regions of the quantum phase diagram of the theory the observable particles, i.e. gauge-invariant bound states, have the same mass as the elementary particles. This is what makes perturbation theory in the electroweak sector possible. Under which conditions this holds true is not only important for understanding the Higgs sector itself, but may have severe implications for observable states in generic higgsed theories. Herein, the underlying mechanisms are studied with the standard-model Yang-Mills-Higgs sector as an example, using lattice gauge theory. It is shown under which conditions a perturbative description can be expected to give an accurate representation of the observable states. Especially, it is found that only in a rather narrow range of Higgs masses this appears possible, and it is briefly digressed on the connection to the experimental results. In addition, some remarks will be given on the situation in more general theories, which are relevant to the construction of extensions of the standard model.
Primary author
Dr.
Axel Maas
(University of Jena)
