Abstract
We present measurements of two-particle differential number correlation functions and transverse momentum correlation functions , obtained from -Pb collisions at 5.02 TeV and Pb-Pb collisions at 2.76 TeV. The results are obtained by using charged particles in the pseudorapidity range and transverse momentum range GeV/ as a function of pair separation in pseudorapidity, , azimuthal angle , and for several charged-particle multiplicity classes. Measurements are carried out for like-sign and unlike-sign charged-particle pairs separately and combined to obtain charge-independent and charge-dependent correlation functions. We study the evolution of the width of the near-side peak of these correlation functions with collision centrality. Additionally, we study Fourier decompositions of the correlators in as a function of pair separation . Significant differences in the dependence of their harmonic coefficients on multiplicity classes are found. These differences can be exploited, in theoretical models, to obtain further insight into charged-particle production and transport in heavy-ion collisions. Moreover, an upper limit of nonflow contributions to flow coefficients measured in Pb-Pb collisions based on the relative strength of Fourier coefficients measured in -Pb interactions is estimated.
25 More- Received 23 May 2018
- Revised 15 January 2019
DOI:https://doi.org/10.1103/PhysRevC.100.044903
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©2019 CERN, for the ALICE Collaboration