Thursday, October 6, 2016, 16:00
WHGA Auditorium
Gerhard Buchalla, LMU Munich
Abstract:
The properties of the Higgs boson will be investigated with increasing
precision during the coming years in order to probe the dynamics of
electroweak symmetry breaking. While the Higgs couplings are compatible
with the Standard Model at present, deviations of order 10% or more are
currently still allowed. With the precision goal for Higgs couplings of
a few percent at LHC Run II and III, it will be possible to test a
scenario, in which anomalous Higgs couplings are the dominant effects of
new physics in the electroweak sector. Such a scenario leads to an
effective field theory (EFT) that has the form of an electroweak chiral
Lagrangian, including a light Higgs. We discuss the systematics and the
power counting of this approach, its relation to an EFT organized in
terms of the canonical dimension of operators, and phenomenological
applications. We discuss in particular how the electroweak chiral EFT
provides us with a quantum field theory justification for the usual
kappa parametrization of Higgs couplings.