Signatures of the anomalous Z gamma and ZZ production at lepton and hadroncolliders - art. no. 073013

The possible form of new physics (NP) interactions affecting the ZZZ, ZZ ga mma, and Z gamma gamma vertices is critically examined. Their signatures an d the possibilities to study them, through ZZ and Z gamma production, at th e CERN e(-)e(+) colliders LEP and LC and at the hadronic colliders, the Fer milab Tevatron and CERN LHC, are investigated. Experimental limits obtained or expected on each coupling are collected. A simple theoretical model bas ed on virtual effects due to some heavy fermions is used for acquiring some guidance on the plausible forms of these NP vertices. In such a case speci fic relations among the various neutral couplings are predicted, which can be experimentally tested and possibly used to constrain the form of the res ponsible NP structure.