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In the spirit of the Composite Standard Model (CSM) we look at the effect of$H$, $Z_L$ compositeness on $ZH$ production in gluon-gluon and photon-photoncollisions. Because they would perturb the basic cancellations occuring in SMamplitudes, such compositeness effects would lead to spectacular modificationsof the energy dependence of the amplitudes and cross sections. We illustratethis fact by introducing $H$, $Z_L$ test form factors and computing thecorresponding differential cross section and the fraction of longitudinal $Z_L$production.

Test of Higgs boson compositeness in $ZH$ production through gluon-gluon and photon-photon collisions