Di-jet production in γ γ collisions at LEP2

The production of two high- p T jets in the interactions of quasi-real photons in e + e - collisions at sqrt{s_{ee}} from 189 GeV to 209 GeV is studied with data corresponding to an integrated e + e - luminosity of 550 pb-1. The jets reconstructed by the k ⊥ -cluster algorithm are defined within the pseudo-rapidity range -1< η<1 and with jet transverse momentum, p T , above 3 GeV/c. The differential di-jet cross-section is measured as a function of the mean transverse momentum overline{pT} of the jets and is compared to perturbative QCD calculations.