A Screening Mechanism for Extra W and Z Gauge Bosons

Abstract

We generalize a previous construction of a fermiophobic model to the case of more than one extra W and Z gauge bosons. We focus in particular on the existence of screening configurations and their implication on the gauge boson mass spectrum. One of these configurations allows for the existence of a set of relatively light new gauge bosons, without violation of the quite restrictive bounds coming from the ρ NC parameter. The links with Bess and degenerate Bess models are also discussed. Also the signal given here by this more traditional gauge extension of the SM could help to disentangle it from the towers of Kaluza-Klein states over W and Z gauge bosons in extra dimensions.

Low-energy photon–neutrino inelastic processes beyond the Standard Model

“…For a more general case with more than one generation of W ′± and Z ′ , see Ref. [18]. We will keep the notation used in [17].…”

“…and, of course, g L = √ 4πα/s W . The stronger bounds [16] on our input parameters comes from the flavour-changing neutral-current FCNC (mainly the K L − K S mass difference) [19,20], but they depend on the assumptions of the model (manifestly LR symmetric models [21], g L = g R models [20], fermiophobic models [17,18], etc.). For instance, in manifestly symmetric Left-Right models with g L = g R , the bound on the mass of the W ′ is M W ′ > ∼ 1.6 TeV.…”