Cross section of hadron production in γγ collisions at LEP

Abstract

The reaction e⁺e^-→e⁺e^-γ^∗γ^∗→e⁺e^- hadrons is analysed using data collected by the L3 detector during the LEP runs at √s=130-140 GeV and √s=161 GeV. The cross sections σ(e⁺e^- →e⁺e^- hadrons) and σ(γγ → hadrons) are measured in the interval 5 ≤ W_γγ ≤ 75 GeV. The energy dependence of the σ(γγ → hadrons) cross section is consistent with the universal Regge behaviour of total hadronic cross sections.