New Higgs interactions in ZZγand Zγγproduction

The effect of new operators that only modify the bosonic couplings of the Higgs boson, without altering the WWγ or WWZ three-point functions, are examined in the e+e−→ZZγ and Zγγ processes. We analyse the constraints on these interactions that can be imposed by the LEP II collider at CERN and at the Next Linear Collider.