Abstract:
The second- and third-order azimuthal anisotropy Fourier harmonics of charged particles produced in \(\text{pPb}\) collisions, at \(\sqrt{{s}_{NN}}=8.16\phantom{\rule{0.16em}{0ex}}\text{TeV}\), are studied over a wide range of event multiplicities. Multiparticle correlations are used to isolate global properties stemming from the collision overlap geometry. The second-order “elliptic” harmonic moment is obtained with high precision through four-, six-, and eight-particle correlations and, for the first time, the third-order “triangular” harmonic moment is studied using four-particle correlations. A sample of peripheral \(\text{PbPb}\) collisions at \(\sqrt{{s}_{NN}}=5.02\phantom{\rule{0.16em}{0ex}}\text{TeV}\) that covers a similar range of event multiplicities as the \(\text{pPb}\) results is also analyzed. Model calculations of initial-state fluctuations in \(\text{pPb}\) and \(\text{PbPb}\) collisions can be directly compared to the high-precision experimental results. This work provides new insight into the fluctuation-driven origin of the \({v}_{3}\) coefficients in \(\text{pPb}\) and \(\text{PbPb}\) collisions, and into the dominating overall collision geometry in \(\text{PbPb}\) collisions at the earliest stages of heavy ion interactions.
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