Multiparticle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider
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Abstract
Measurements of multiparticle azimuthal correlations (cumulants) for
charged particles in p-Pb at root s(NN) = 5.02 TeV and Pb-Pb at root
s(NN) = 2.76 TeV collisions are presented. They help address the
question of whether there is evidence for global, flowlike, azimuthal
correlations in the p-Pb system. Comparisons are made to measurements
from the larger Pb-Pb system, where such evidence is established. In
particular, the second harmonic two-particle cumulants are found to
decrease with multipplicity, characteristic of a dominance of
few-particle correlations in p-Pb collisions. However, when a vertical
bar Delta eta vertical bar gap is placed to suppress such correlations,
the two-particle cumulants begin to rise at high multiplicity,
indicating the presence of global azimuthal correlations. The Pb-Pb
values are higher than the p-Pb values at similar multiplicities. In
both systems, the second harmonic four-particle cumulants exhibit a
transition from positive to negative values when the multiplicity
increases. The negative values allow for a measurement of v(2)\{4\} to
be made, which is found to be higher in Pb-Pb collisions at similar
multiplicities. The second harmonic six-particle cumulants are also
found to be higher in Pb-Pb collisions. In Pb-Pb collisions, we
generally find v(2)\{4\} similar or equal to v(2)\{6\} not equal 0 which
is indicative of a Bessel-Gaussian function for the v(2) distribution.
For very high-multiplicity Pb-Pb collisions, we observe that the
four-and six-particle cumulants become consistent with 0. Finally, third
harmonic two-particle cumulants in p-Pb and Pb-Pb are measured. These
are found to be similar for overlapping multiplicities, when a vertical
bar Delta eta vertical bar > 1.4 gap is placed.... Show more Show less