Heavy quarkonium in saturated environment of high-multiplicity pp collisions

Abstract

High-multiplicity pp collisions exhibit features, traditionally associated with nuclear effects. Coherence motivates to treat high-multiplicity pp, pA and AA collisions on an equal footing. We rely on the phenomenological parametrization for mean multiplicities of light hadrons and J/psi, assuming their linear dependence on N_{coll} in pA collisions. The results of this approach underestimate the recently measured production rate of J/psi at very high hadronic multiplicities. The linear dependence of J/psi multiplicity on N_{coll} is subject to predicted nonlinear corrections, related to mutual boosting of the saturation scales in colliding dense parton clouds. A parameter-free calculation of the non-linear corrections allows to explain data for pT-integrated yield of J/psi at high hadronic multiplicities. Calculations are in a good accord with data binned in several pT-intervals as well. As was predicted, Upsilon and J/psi are equally suppressed at forward rapidities in pA collisions. Consequently, their fractional multiplicities at forward rapidities in pp collisions are equal as well, and their magnitude agrees with data.

arXiv comment6 pages, 4 figures, 2 references added

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Cited by in corpus (8)

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• $J/\psi$ polarization in high multiplicity $pp$ and $pA$ collisions: CGC+NRQCD approach
• EIC Physics from An All-Silicon Tracking Detector
• Forward rapidity J/$\psi$ production as a function of charged-particle multiplicity in pp collisions at $\sqrt{s}=$ 5.02 and 13 TeV
• Isolated photon production in $pp$ collisions at forward rapidities and high multiplicity events
• Strangeness Enhancement due to String Fluctuations
• Kaon production in high multiplicity events at the LHC
• Multiplicity dependence of ${\rm Y}$ production at forward rapidity in pp collisions at $\sqrt{s}$ = 13 TeV