Study of ZZ production in $e^{+}e^{-}$ collisions at $\sqrt{s}$ = 189 GeV with the L3 detector at LEP

A study of ZZ production using the 176 pb/sup -1/ of integrated luminosity collected by the L3 detector at LEP at the center of mass energy of 188.66 GeV is performed. The ZZ production cross section is measured to be sigma /sub ZZ/=0.54/sub -0.14//sup +0.16/ pb, in agreement with the Standard Model expectation. No evidence for the existence of anomalous triple gauge boson ZZZ and ZZ gamma couplings is found and limits on these couplings are set. All the presented results are preliminary. (11 refs).