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A remark on the sign change of the four-particle azimuthal cumulant in small systems
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✦ hep-ph
hep-exnucl-exnucl-th
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azimuthalchangecumulantsignsmallagreementatlascalculated
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The azimuthal cumulants, $c_2\{2\}$ and $c_2\{4\}$, originating from the global conservation of transverse momentum in the presence of hydro-like elliptic flow are calculated. We observe the sign change of $c_2\{4\}$ for small number of produced particles. This is in a qualitative agreement with the recent ATLAS measurement of multi-particle azimuthal correlations with the subevent cumulant method.
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Cited by 1 Pith paper
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Effectiveness of nonflow suppression using multi-particle correlators
Toy models show multi-particle correlators can increase rather than reduce deviation from true flow harmonics in small collision systems.
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