Measurement of gamma gamma->taut au and the limint on tau anomalous magnetic

and electric moment

L3 collaboration

The QED processes e+e- --> e+e- mu+mu- and e+e- --> e+e- tau+tau- are studied

with the L3 detector at LEP using an untagged data sample collected

at centre-of-mass energies 161 GeV < sqrt(s) < 209 GeV. The TAU -pairs

are observed through the associated decay of one tau into e nu nu

and the other into pi pi nu. The cross sections are measured as a function of sqrt(s).

For muon pairs, the cross section of the g g --> mu+mu- process is also measured

as a function of the two-photon centre-of-mass energy for 3 GeV < W(gg) < 40 GeV.

Good agreement is found between these measurements and the O (alpha^4)

QED expectations. In addition, limits on the anomalous magnetic

and electric dipole moments of the tau lepton are extracted.