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

作者：Abelev B^*; Adam J; Adamova D; Adare A M; Aggarwal M M; Rinella G Aglieri; Agnello M; Agocs A G; Agostinelli A; Ahammed Z; Masoodi A Ahmad; Ahmad N; Ahmed I; Ahn S A; Ahn S U; Aimo I; Ajaz M; Akindinov A; Aleksandrov D; Alessandro B; Alexandre D; Alici A; Alkin A; Alme J; Alt T; Altini V; Altinpinar S; Altsybeev I; Andrei C; Andronic A; Anguelov V; Anielski J; Anson C; Anticic T; Antinori F; Antonioli P; Aphecetche L

来源：Physics Letters B, 2013, 727(4-5): 371-380.

DOI：10.1016/j.physletb.2013.10.054

The average transverse momentum (p(T)) versus the charged-particle multiplicity N-ch was measured in p-Pb collisions at a collision energy per nucleon-nucleon root S-NN = 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 < p(T) < 10.0 GeV/c and vertical bar eta vertical bar < 0.3 with the ALICE apparatus at the LHC. These data are compared to results in Pb-Pb collisions at root S-NN = 2.76 TeV at similar charged-particle multiplicities. In pp and p-Pb collisions, a strong increase of (p(T)) with N-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.

• 出版日期2013-12-18
• 单位华中师范大学