Abstract
The production of the Z boson pairs via fusion γγ → ZZ of the two polarized backscattered laser photons at an e +e − linear collider is considered. Complete one-loop SM calculation is done and explicit formulas for bosonic loop contributions to the helicity amplitudes are given. The results are used to study Higgs boson production for m H > 2 m Z at a photon linear collider. It is shown that transversely polarized Z TZ T pair production would represent a severe irreducible background to the observation of the Higgs boson with m H > 350 GeV if Z boson polarization would not be detected. Total cross section of Z TZ T pair production is as large as hundreds of femtobarns at √ S γγ ≥ 500 GeV and does not decrease with energy. The anticipated photon-photon luminosity should be sufficient to detect hundreds of Z boson pairs yearly. The reaction γγ → ZZ may provide tests of anomalous triple and quartic gauge boson couplings.
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