Non-flow effects in three-particle mixed-harmonic azimuthal correlations in small collision systems

Abstract

The Multi-particle technique has been used to unravel the nature of the long-range collectivity in small collision systems. A large three-particle mixed-harmonic correlation signal was recently observed by the ATLAS Collaboration, but the role of non-flow correlations is not yet studied. We estimate the influence of non-flow correlations to the three-particle correlators in $pp$ and $p$+Pb collisions using PYTHIA and HIJING models, and compare with the ATLAS results. The large non-flow effects from the jet and dijet production is found to be largely suppressed in $p$+Pb collisions using the subevent cumulant method by calculating the azimuthal correlation between two or more longitudinal pseudorapidity ranges. Depending on the experimental subevent method, however, the non-flow effects may still be significant in $pp$ collisions.

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Cited by in corpus (11)

• Fluctuations of anisotropic flow in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Probing the nuclear deformation with three-particle asymmetric cumulant in RHIC isobar runs
• Non-flow effects in correlation between harmonic flow and transverse momentum in nuclear collisions
• Model investigations of the correlation between the mean transverse momentum and anisotropic flow in shape-engineered events
• Characterizing the initial and final state effects of relativistic nuclear collisions
• Measuring differential flow angle fluctuations in relativistic nuclear collisions
• Model study of the energy dependence of the correlation between anisotropic flow and the mean transverse momentum in Au+Au collisions
• The three point asymmetric cumulants in high multiplicity pp collisions
• Symmetric cumulant $s{c}_{2,4}\left\{4\right\}$ and asymmetric cumulant $a{c}_2\left\{3\right\}$ from transverse momentum conservation and flow
• Measuring differential particle correlations in relativistic nuclear collisions
• Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC