Bilepton effects on theWWV*vertex in the 331 model with right-handed neutrinos via aSUL(2)×

Abstract

Bilepton effects on the W W V * vertex in the 331 model with right-handed neutrinos via a SU L (2) × U Y (1) covariant quantization scheme In a recent paper [1], we investigated the effects of the massive charged gauge bosons (bileptons) predicted by the minimal 331 model on the off-shell vertex W W V * (V = γ, Z) using a SUL(2) × UY (1) covariant gauge-fixing term for the bileptons. We proceed along the same lines and calculate the effects of the gauge bosons predicted by the 331 model with right-handed neutrinos. It is found that the bilepton effects on the W W V * vertex are of the same order of magnitude than those arising from the SM and several of its extensions, provided that the bilepton mass is of the order of a few hundred of GeVs. For heavier bileptons, their effects on the W W V * vertex are negligible. The behavior of the form factors at high energies is also discussed as it is a reflect of the gauge invariance and gauge independence of the W W V * Green function obtained via our quantization method.

Quark-flavor-changing Higgs decays from a universal extra dimension

“…characterized by the gauge-fixing parameter, ξ. Nonlinear gauge-fixing schemes like this have been utilized before in extra-dimensional contexts [57,58,70,100,101], while their use has been of profit in the SM [102,103] and SM extensions as well [104][105][106][107][108]. Within this gauge-fixing approach, we carry out the calculation in the Feynman-'t Hooft gauge, which corresponds to the value ξ = 1.…”

Charged and Neutral Currents in a 3-3-1 Model With Right-Handed Neutrinos

“…[47][48][49][50][51][52][53][54] One of the most stringent features that any extension of the SM has to enclose is that of the mass generation and mixing pattern for the three flavor neutrinos, since the neutrino oscillation phenomenon was experimentally confirmed. Therefore, many attempts to solve this issue have been proposed successively.…”

DecaysZ′→γγγandZ→γγγin the minimal 331 model

“…[15,[22][23][24], these and other new rules are summarized at the Appendix A. Finally, the scalar contributions are characterized by the following amplitudes…”

“…For calculation purposes, it is convenient to organize the amplitudes according to the spin of particles circulating in the loops. This is possible since we calculate the gauge particles contribution using covariant gauges R ξ -gauges [15,[22][23][24], which separately render finite and gauge invariant the pseudo Goldstone bosons and ghosts contributions…”

“…To carry out the W + contribution we used a covariant gauge-fixing procedure as the one presented in [15,22]. As far as the bilepton contribution is concerned, we used the Feynman rules that arise from the gauge-fixing procedure used in [23,24]. The Feynman rules for all possible couplings among the neutral and charged gauge bosons of the minimal 331 model can be found at the Appendix A.…”