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E. Ruiz Morales

Publications and source records attributed to E. Ruiz Morales.

7 recordsLinked to original sources
arXiv2000

LHC sensitivity to the resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector

We present a unified analysis of the two main production processes of vector boson pairs at the LHC, VV-fusion and qqbar annihilation, in a minimal strongly interacting electroweak symmetry breaking sector. Using a unitarized electroweak chiral Lagrangian formalism and modeling the final V_L V_L strong rescattering effects by a form factor, we describe qqbar annihilation processes in terms of the two chiral parameters that govern elastic V_L V_L scattering. Depending on the values of these two chiral parameters, the unitarized amplitudes may present resonant enhancements in different angular momentum-isospin channels. Scanning this two parameter space, we generate the general resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector and determine the regions that can be probed at the LHC.

hep-ph↗
arXiv1999

Probing Strong Electroweak Symmetry Breaking in W+ W- -> t \bar t

We study the process $W^+ W^- \to t \bar t$ in several models of strong interaction electroweak symmetry breaking. We calculate the signals that can be expected by observing the reaction $e^+ e^- \to ν\barνt \bar t$ at an $e^+ e^-$ linear collider with 1.5 TeV center of mass energy. We also discuss how the lowest-lying resonances predicted by these models could be identified using top polarization observables.

hep-ph↗
arXiv1995

Learning about the strongly interacting symmetry breaking sector at LHC

In the present work we study the predictions for $WZ$ and $ZZ$ production at LHC with the Electroweak Chiral Lagrangian (EChL) approach. Our analysis will be focused on the less favored case from the experimental point of view, in which the predictions for the gauge bosons scattering amplitudes are considered in the low energy range where, by construction of the low energy approach, they reveal no resonant behavior. The study includes the complete set of amplitudes for all the polarization states of the initial and/or final gauge bosons and makes no use of the Equivalence Theorem. We express the results in terms of the range of values of the chiral parameters that will be accessible at LHC.

hep-ph↗
arXiv1994

The electroweak chiral Lagrangian as an effective field theory of the standard model with a heavy Higgs

Using effective field theory methods, we integrate out the standard model Higgs boson to one loop and represent its non-decoupling effects by a set of gauge invariant effective operators of the electroweak chiral Lagrangian. We briefly discuss the relation between the renormalization of both the standard model and the effective theory, which is crucial for a correct understanding and use of the electroweak chiral Lagrangian. Some examples have been chosen to show the applicability of this effective Lagrangian approach in the calculation of low energy observables in electroweak theory.

hep-ph↗
arXiv1994

The electroweak chiral parameters for a heavy Higgs in the Standard Model

We study the electroweak interactions within the standard electroweak theory in the case where the Higgs particle is heavy, namely, $M_H \leq 1\;TeV$. By integrating out the Higgs boson to one loop we find the complete effective lagrangian, called electroweak chiral lagrangian, that is $SU(2)_L\times U(1)_Y$ invariant and contains the whole set of operators up to dimension four. The values of the chiral parameters representing the non-decoupling effects of the heavy Higgs are presented. Some examples have been chosen to show the applicability of this effective lagrangian approach to compute phenomenologically relevant quantities that either are being meassured at present or will be meassured in future experiments.

hep-ph↗
arXiv1993

The Electroweak Chiral Lagrangian for the Standard Model with a Heavy Higgs

The most general chiral Lagrangian for electroweak interactions with the complete set of $SU(2)_L\times U(1)_Y$ invariant operators up to dimension four is considered. The two-point and three-point functions with external gauge fields are derived from this effective chiral Lagrangian to one-loop order in a generic $R_ξ$-gauge. The same set of Green's functions are paralelly studied in the renormalizable standard model to one-loop order, in a $R_ξ$-gauge and in the large Higgs mass limit. An appropriate set of matching conditions connecting the Green's functions of the two theories allows us to derive, systematically, the values of the chiral Lagrangian coefficients corresponding to the large Higgs mass limit of the standard model. These chiral parameters represent the non-decoupling effects of a heavy Higgs particle and incorporate both the leading logarithmic dependence on $\mh$ and the next to leading constant contributions. Some phenomenological implications are also discussed.

hep-ph↗