Production of two c c pairs in gluon-gluon scattering in high energy proton-proton collisions
Abstract
We calculate cross sections for g g Q Q Q Q in the high-energy approximation in the mixed (longitudinal momentum fraction, impact parameter) and momentum space representations. Besides the total cross section as a function of subsystem energy also differential distributions (in quark rapidity, transverse momentum, Q Q, Q Q invariant mass) are presented. The elementary cross section is used to calculate production of (c c) (c c) in single-parton scattering (SPS) in proton-proton collisions. We present integrated cross section as a function of proton-proton center of mass energy as well as differential distribution in M(c c)(c c). The results are compared with corresponding results for double-parton scattering (DPS) discussed recently in the literature. We find that the considered SPS contribution to (c c)(c c) production is at high energy (s > 5 TeV) much smaller than that for DPS contribution.
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