The average transverse momentum ⟨pT⟩ versus the charged-particle multiplicity Nch was measured in p–Pb collisions at a collision energy per nucleon–nucleon pair √sNN = 5.02 TeV and in pp collisions with the ALICE apparatus at the LHC. These data are compared to results in Pb–Pb collisions at √sNN = 2.76 TeV at similar charged-particle multiplicities. In pp and p–Pb collisions, a strong increase of ⟨pT⟩ with Nch 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.

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

ARNALDI, Roberta;BALA, RENU;BEOLE', Stefania;BERZANO, DARIO CARLO DOMENICO;BIANCHI, LIVIO;BOTTA, Elena;BRUNA, ELENA;BUFALINO, STEFANIA;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;MASERA, Massimo;MILANO, LEONARDO;OPPEDISANO, Chiara;RAMELLO, Luciano;RUSSO, RICCARDO;SCOMPARIN, ENRICO;SITTA, Mario;VALLERO, Sara;VERCELLIN, Ermanno;
2013-01-01

Abstract

The average transverse momentum ⟨pT⟩ versus the charged-particle multiplicity Nch was measured in p–Pb collisions at a collision energy per nucleon–nucleon pair √sNN = 5.02 TeV and in pp collisions with the ALICE apparatus at the LHC. These data are compared to results in Pb–Pb collisions at √sNN = 2.76 TeV at similar charged-particle multiplicities. In pp and p–Pb collisions, a strong increase of ⟨pT⟩ with Nch 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.
2013
727
371
380
http://arxiv.org/abs/1307.1094
Multiplicity dependence; transverse momentum; pp; p–Pb; and Pb–Pb collisions
B. Abelev; J. Adam; D. Adamová; A.M. Adare; M.M. Aggarwal; G. Aglieri Rinella; M. Agnello; A.G. Agocs; A. Agostinelli; Z. Ahammed; N. Ahmad; A. Ahmad ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/143054
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