Numerical solutions to Giovannini’s QCD parton branching processes
Department of Physics, National University of Singapore. 2 Science Drive 3, Singapore 117551.
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Published online: 21 August 2020
In 1979, Giovannini  formulated multiparticle production as a manifestation of four QCD processes: A: g → gg (gluon bremsstrahlung), A-: q → qg (quark bremsstrahlung), B: g → qq (quark pair creation) and C: g → ggg (four-gluon vertex). At present, only approximate solutions exist, such as the Generalized Multiplicity Distribution (GMD) which excludes pro- cesses B and C [2, 3]. These approximate solutions have been very successful in describing charged particle multiplicities at lower energies, at least until the appearance of a shoulder-like structure at √s ≈ 200 GeV and 900 GeV first reported by the UA5 collaboration , also known as “KNO-scaling violation”. Here, we extend the work of Sakai  and attempt a numerical solution that incorporates all four QCD processes, and see if the addition of processes B and C can explain the shoulder-like structure.
© The Authors, published by EDP Sciences, 2020
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