9,009 research outputs found
Unitarity constraints on chiral perturbative amplitudes
Low lying scalar resonances emerge as a necessary part to adjust chiral
perturbation theory to experimental data once unitarity constraint is taken
into consideration. I review recent progress made in this direction in a model
independent approach. Also I briefly review studies on the odd physical
properties of these low lying scalar resonances, including in the
processes.Comment: Talk given at: International Workshop on Effective Field Theories:
from the pion to the upsilon, February 2-6 2009, Valencia, Spai
Scalar resonance at 750 GeV as composite of heavy vector-like fermions
We study a model of scalars which includes both the SM Higgs and a scalar
singlet as composites of heavy vector-like fermions. The vector-like fermions
are bounded by the super-strong four-fermion interactions. The scalar singlet
decays to SM vector bosons through loop of heavy vector-like fermions. We show
that the surprisingly large production cross section of di-photon events at 750
GeV resonance and the odd decay properties can all be explained. This model
serves as a good model for both SM Higgs and a scalar resonance at 750 GeV.Comment: 12 pages, no figure, references updated, version for publicatio
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