Universality of the underlying event in pp collisions

Abstract

In this paper we study ATLAS results on underlying event in pp collisions at $\sqrt{s}$=0.9, 7 and 13 TeV. We show that the center-of-mass energy dependences of the charged-particle production sensitive to the underlying event ("transverse" region) and to the hardest partonic interaction ("towards" and "away" regions) in pp collisions can be both understood in terms of the change of the inclusive average multiplicity. Within uncertainties, the corresponding particle production as a function of the leading charged particle shows no significant $\sqrt{s}$-dependence for the three regions once they are scaled according to the relative change in multiplicity. The scaling properties reported here are well reproduced by PYTHIA 8.212 tune Monash 2013 and suggest an universality of the underlying event in hadronic interactions at high $\sqrt{s}$. Based on the simulations, we observed that the same scaling properties are also present in the average number of multi-partonic interactions as a function of the leading charged particle. Moreover, the multiplicity distributions associated to the underlying event exhibit a KNO scaling.

arXiv comment19 pages, 6 figures

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• Particle production and flow-like effects in small systems
• Evolution of strange and multi-strange hadron production with relative transverse multiplicity activity in underlying event
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• Topological studies of light-flavor hadron production in pp, p-Pb, and Pb-Pb collisions with ALICE at the LHC
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• Particle production as a function of underlying-event activity and very forward energy with ALICE
• Effect of color reconnection and hadronic re-scattering on underlying events in pp collisions at LHC energies
• Parton energy loss in pp collisions at very high multiplicity
• Understanding the medium-like effects in the jet-like yield in pp and p-Pb collisions using event generators
• Probing the interaction of semi-hard quarks and gluons with the underlying event in light- and heavy-flavor triggered proton-proton collisions