Ponente
Dr.
Rafael Delgado López
(Complutense University of Madrid)
Descripción
We use the nonlinear electroweak chiral Lagrangian (EChL) and the mathematical properties of the S-matrix (encoded into unitarization methods) for sampling the collider phenomenology of a (hypothetical) strongly interacting electroweak symmetry breaking sector (EWSBS) coupled with ttbar states. The EChL Lagrangian is used as an intermediate energy approximation (E~500 GeV), where the Equivalence Theorem is valid but the EFT does not violate unitarity.
Of highest interest is the EWSBS and the description of the scattering processes between longitudinally polarized gauge bosons and the Higgs-like particle discovered at the LHC. Because ttbar channel is more accessible at the LHC, we couple such processes with ttbar. Hence, we use the A[W_L,Z_L,h-->W_L,Z_L,h] scattering amplitudes computed at NLO, and consider a weak (perturbative) coupling with ttbar states, in order to compute the A[W_L,Z_L,h-->t tbar] scattering amplitudes.
Unitarization procedures are used to extend the validity range of the EFT up to the first resonance, where the EFT perturbative expansion breaks down. We develop a modified version of several unitarization procedures in order to simplify the computation by considering that coupling with ttbar states is perturbative..
Autor primario
Dr.
Rafael Delgado López
(Complutense University of Madrid)
Coautores
Dr.
Andres Castillo
(Universidad Nacional de Colombia)
Prof.
Antonio Dobado
(Departamento de Física Teórica. Universidad Complutense)
Prof.
Felipe J. Llanes Estrada
(Depto. Física Teórica I, Universidad Complutense de Madrid)
