Correlated long-range mixed-harmonic fluctuations in $pp$, $p$+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector

+Pb, and 2.76 TeV peripheral Pb+Pb collisions with the ATLAS detector at the LHC. The goal is to understand the multi-particle nature of the long-range collective phenomenon in these collision systems. The large non-flow background from dijet production present in the standard cumulant method is suppressed using a method of subevent cumulants involving two, three and four pseudorapidity-separated subevents. The results show an anti-correlation between

v_2

and

v_3

and a positive correlation between

v_2

and

v_4

for all collision systems and over the full multiplicity range. However, the magnitudes of the correlations are found to depend strongly on the event multiplicity, transverse momentum and the collision systems. The relative correlation strength, obtained by normalization of the cumulants with the

\langle v_n^2\rangle

from a two-particle correlation analysis, is similar in the three collision systems and depends weakly on the event multiplicity and transverse momentum. The new results based on the subevent methods provide strong evidence for a similar long-range multi-particle collectivity in

pp

,

p

+Pb and peripheral Pb+Pb collisions

Note:

Preliminary results

collectivity
small system
ridge
cumulants
talk
p p: scattering
p nucleus: interaction
heavy ion: scattering
lead
correlation: two-particle

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Correlated long-range mixed-harmonic fluctuations in pppppp, ppp+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector

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Correlated long-range mixed-harmonic fluctuations in $pp$ , $p$ +Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector