Speaker
Mr.
Juan Gonzalez-Fraile
(Universitat de Barcelona)
Description
In a model independent framework, the effects of new physics can be
parametrized in terms of an effective Lagrangian at the electroweak
scale. If the SU(2)L x U(1)Y gauge symmetry is linearly realized,
these effects appear at lowest order as dimension--six operators,
containing all the SM fields an the light scalar doublet. With a
proper choice of the operator basis we perform a global fit to all
the existing updated available data related to the EWSB sector:
triple gauge boson vertex (TGV) measurements, electroweak precision
tests and Higgs searches. In this framework modifications of the
couplings of the Higgs field to the electroweak gauge bosons are
related to anomalous TGVs. We show that the analysis of the latest
Higgs boson data at the LHC and Tevatron gives rise to strong bounds
on TGVs that are complementary to those from direct TGV analysis. We
then present the tight constraints on TGVs obtained by combining all
the available data on direct TGV studies and on Higgs production
analysis. Interestingly, we show that this correlated pattern of
deviations from Standard Model predictions and couplings can be
different for theories of new physics based on a non-linear
realization of the SU(2)L×U(1)Y symmetry. Furthermore, anomalous
signals expected at first order in the non-linear realization may
appear only at higher orders of the linear one, and viceversa. We
analyze in detail the impact of both type of discriminating signals
on LHC physics. They could lead to hints on the nature of the
observed boson.
Primary author
Mr.
Juan Gonzalez-Fraile
(Universitat de Barcelona)