rho meson production in two photon collision at LEP with L3 detector

The reaction gamma gamma --> pi (+)pi (-)pi (+)pi (-) has been studied with the L3 detector at LEP. The data sample was collected by L3 at centre-of-m ass energies from 160 GeV to 202 GeV with a total integrated luminosity of 466.2 pb(-1) The process is dominated by rho (0)rho (0) production. A spin- parity analysis of the rho (0)rho (0) system for W gamma gamma < 3 GeV show s a dominance of J(P) = 2(+) and helicity 2. A contribution of J(P) = 0(+) is also observed whereas contributions of negative parity states are found to be negligible.