Abstract
Abstract Thermalization of quark matter and antiquark matter is studied with quark–quark–antiquark as well as quark–antiquark–antiquark elastic scatterings. Squared amplitudes of q q q ¯ → q q q ¯ and q q ¯ q ¯ → q q ¯ q ¯ at order α s 4 are derived in perturbative QCD. Solved by a new technique, solutions of transport equations with the squared amplitudes indicate that the scatterings q q q ¯ → q q q ¯ and q q ¯ q ¯ → q q ¯ q ¯ shorten the thermalization time of quark matter and antiquark matter. It is emphasized that three-parton and other multi-parton scatterings become important at the high parton number density achieved in RHIC Au–Au collisions.
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