J/ψ plus dijet associated production in two-photon collisions Original Research Article

We study the production of a J/ψ meson in association with one or two jets in γγ collisions concentrating on the direct-photon contribution, which is expected to be dominant for large J/ψ-meson transverse momentum and/or large dijet invariant mass. We work at leading order in the factorization formalism of nonrelativistic QCD and include all relevant colour-octet processes. We present distributions in J/ψ-meson transverse momentum and rapidity appropriate for CERN LEP2, a future e+e− linear collider, and a possible γγ collider mode of the latter. In the case of the e+e− linear collider, we assume the beamstrahlung spectrum appropriate for DESY TESLA.