t-channel factorization description of γγ→V₁V₂

A t-channel factorization model is used to estimate cross sections for the processes γγ→V₁V₂. Whenever V=ρ, the width of the ρ has been included in the calculations. The channels γγ→ρ⁰ρ⁰, ρ⁰φ{symbol}, φ{symbol}φ{symbol}, ωω, ρ⁰ω and ρ⁺ρ^- are calculated for two quasi-real photons. Predictions are also given for the process γ^*γ→ρ⁰ρ⁰ for virtual photon mass squared Q²<5 GeV². Our results are consistent with all available experimental data.