Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC

Abstract

The average transverse momentum $⟨p_{\mathrm{T}}⟩$ versus the charged-particle multiplicity $N_{\mathrm{ch}}$ was measured in p-Pb collisions at a collision energy per nucleon-nucleon pair $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and in pp collisions at collision energies of $\sqrt{s}=0.9$, 2.76, and 7 TeV in the kinematic range $0.15<p_{\mathrm{T}}<10.0$ GeV/$c$ and $|\eta |<0.3$ with the ALICE apparatus at the LHC. These data are compared to results in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV at similar charged-particle multiplicities. In pp and p-Pb collisions, a strong increase of $⟨p_{\mathrm{T}}⟩$ with $N_{\mathrm{ch}}$ is observed, which is much stronger than that measured in Pb-Pb collisions. For pp collisions, this could be attributed, within a model of hadronizing strings, to multiple-parton interactions and to a final-state color reconnection mechanism. The data in p-Pb and Pb-Pb collisions cannot be described by an incoherent superposition of nucleon-nucleon collisions and pose a challenge to most of the event generators.

18 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/596

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