Scalar Boson Production and Decay in Composite Models*

In composite models where vector bosons (IV*, g) and scalar boson (I-I) are made of the same subconstituents and especially in W-dominance models we show that couplings like HZ?, H77, Hgg can be rather large. As a consequence the decay pattern and the production rates of scalar bosons in e+e-, 77 and hadron-hadron collisions can be completely different from the standard Higgs case. Submitted to Physics Letters B * Work supported in part by the Department of Energy, contract DEAC0376SF00515 and by Centre National de la Recherche Scientifique, France. Recently several arguments have been given in favor of models which consider weak interactions as a residual effect of quark and lepton compositeness [l][7]. Composite IV*, 2 boson exchanges between leptons or quarks are the weak analogue of meson exchanges between hadrons during strong interactions. In addition it has been shown that one can reproduce most of the results of the standard model at low energy if one makes the assumption of single W dominance for electroweak processes [6]-[7]. In this note we want to show that such a picture may strongly depart from the standard model when one considers some processes involving composite scalar (or pseudoscalar) bosons. We show that couplings like ZH7, H77, Hgg can be rather large so that the decay pattern and the production rates of these scalar bosons will strongly differ from the standard case. The W-dominance model [6]-[7] (WDM) is the-analogue of the old vector meson dominance model (VDM) for photon-hadron interaction. The W3 neutral boson (which get mixed (5) with the photon into the 2 state) enhances the electromagnetic form factors of leptons and quarks (for s E A4$) through the 7 W3 junction (fig. 1). For on-shell photons the WDM relation: applied to the state F = @r with the value of the 7 W3 junction: e9rw $e+e= e and gwe+e= e/ sin 6~ gives 1 zg=sinBw N 2 . (2) It can then be used for any other final state F when a single W exchange is dominant: +rF = w sin 0~ . (3)