Multiplicity dependence of the average transverse momentum in pp, p–Pb, and Pb–Pb collisions at the LHC
B. I. Abeleva, J. Adamb, D. Adamovác, Andrew Marshall Adared, M. M. Aggarwale, G. Aglieri Rinellaf, M. Agnellog h, Andras Gabor Agocsi, A. Agostinellij, Z. Ahammedk, A. Ahmad Masoodil, Nazeer Ahmadl
- aLawrence Livermore National Laboratory, Livermore, CA, United States
- bFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
- cNuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech Republic
- dYale University, New Haven, CT, United States
- ePhysics Department, Panjab University, Chandigarh, India
- fEuropean Organization for Nuclear Research (CERN), Geneva, Switzerland
- gPolitecnico di Torino, Turin, Italy
- hSezione INFN, Turin, Italy
- iWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
- jDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy
- kVariable Energy Cyclotron Centre, Kolkata, India
- lDepartment of Physics, Aligarh Muslim University, Aligarh, India
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Abstract
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 pair √ s NN = 5.02 TeV and in pp collisions at collision energies of √ s = 0.9, 2.76, and 7 TeV in the kinematic range 0.15 < p T < 10.0 GeV/c and |η| < 0.3 with the ALICE apparatus at the LHC.These data are compared to results in Pb-Pb collisions at √ 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.