Two-particle differential transverse momentum and number density correlations in p-Pb collisions at 5.02 TeV and Pb-Pb collisions at 2.76 TeV at the CERN Large Hadron Collider
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J. and Zou, S. and ALICE Collaboration... Show more Show less
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Abstract
We present measurements of two-particle differential number correlation
functions R-2 and transverse momentum correlation functions P-2,
obtained from p-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 vertical bar eta vertical bar < 1.0 and transverse
momentum range 0.2 < p(T) < 2.0 GeV/c as a function of pair separation
in pseudorapidity, vertical bar Delta eta vertical bar, azimuthal angle
Delta phi, annd 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 Delta phi as a function of pair
separation vertical bar Delta eta vertical bar. 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 nu(n) measured in Pb-Pb collisions based on the
relative strength of Fourier coefficients measured in p-Pb interactions
is estimated.... Show more Show less