Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC
Alme, Johan; Erdal, Hege Austrheim; Helstrup, Håvard; Hetland, Kristin Fanebust; Kileng, Bjarte; Altinpinar, Sedat; Djuvsland, Øystein; Fehlker, Dominik; Haaland, Øystein Senneset; Huang, Meidana; Langøy, Rune; Lien, Jørgen; Lønne, Per-Ivar; Nystrand, Joakim; Rehman, Attiq ur; Røed, Ketil; Røhrich, Dieter; Skjerdal, Kyrre; Ullaland, Kjetil; Wagner, Boris; Yang, Shiming; Bätzing, Paul Christoph; Dordic, Olja; Eyyubova, Gyulnara; Kværnø, Henning; Lindal, Svein; Løvhøiden, Gunnar; Milosevic, Jovan; Nilsson, Mads Stormo; Qvigstad, Henrik; Richter, Matthias; Skaali, Toralf Bernhard; Tveter, Trine Spedstad; Wikne, Jon Christopher; Abelev, Betty; Adam, Jaroslav; Adamová, Dagmar; Adare, Andrew Marshall; Aggarwal, Madan M.; Aglieri Rinella, Gianluca; Agocs, Andreas Gabor; Agostinelli, Andrea; Ahammed, Zubayer; Ahmad, Nazeer; Ahmad Masoodi, Arshar; Ahn, Sang Un; Ajaz, Muhammad; Akindinov, Alexander; Aleksandrov, Dimitry; Alessandro, Bruno; ALICE Collaboration
Journal article, Peer reviewed
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Original versionPhysics Letters B. 2013, 727 (4-5), 371-380. 10.1016/j.physletb.2013.10.054
The average transverse momentum 〈pT〉〈pT〉 versus the charged-particle multiplicity NchNch was measured in p–Pb collisions at a collision energy per nucleon–nucleon pair root sNN=5.02 TeV and in pp collisions at collision energies of root s=0.9,2.76, and 7 TeV in the kinematic range 0.15[?]pT[?]10.0 GeV/c0.15[?]pT[?]10.0 GeV/c and |η|<0.3|η|<0.3 with the ALICE apparatus at the LHC. These data are compared to results in Pb–Pb collisions at root sNN=2.76 TeV at similar charged-particle multiplicities. In pp and p–Pb collisions, a strong increase of 〈pT〉〈pT〉 with NchNch 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.