A. Doff

Neutrino decay and neutrinoless double beta decay in a 3-3-1 model

In this work we show that the implementation of spontaneous breaking of the lepton number in the 3-3-1 model with right-handed neutrinos gives rise to fast neutrino decay with Majoron emission and generates a bunch of new contributions to the neutrinoless double beta decay.

Light composite Higgs from an effective action for technicolor

We compute an effective action for a composite Higgs boson formed by new fermions belonging to a general technicolor non-Abelian gauge theory, using a quite general expression for the fermionic self-energy that depends on a certain parameter (

Light composite Higgs boson from the normalized Bethe-Salpeter equation

\ensuremath{\alpha}

Chiral symmetry breaking in QCD-like gauge theories with a confining propagator and dynamical gauge boson mass generation

), that defines the technicolor theory from the extreme walking behavior up to the one with a standard operator product expansion behavior. We discuss the values of the trilinear and quadrilinear scalar couplings. Our calculation spans all the possible physical possibilities for mass and couplings of the composite system. In the case of extreme walking technicolor theories we verify that it is possible to have a composite Higgs boson with a mass as light as the present experimental limit, contrary to the usual expectation of a heavy mass for the composite Higgs boson. In this case we obtain an upper limit for the Higgs boson mass, (

Mass and width of a composite Higgs boson

{M}_{H}\ensuremath{\le}\mathcal{O}(700)\text{ }\text{ }\mathrm{GeV}

The 125 GeV boson: A composite scalar?

for

Spontaneous CP violation in the 3-3-1 model with right-handed neutrinos

SU(2{)}_{\mathrm{TC}}

Limit on the fermion masses in technicolor models

), and the experimental data on the Higgs boson mass constrain

How may confinement affect technicolour

SU(N{)}_{\mathrm{TC}}

Scalar bosons in Minimal and Ultraminimal Technicolor: Masses, trilinear couplings and widths

technicolor gauge groups to be smaller than