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arXiv · 1709.09189

Observation of correlated azimuthal anisotropy Fourier harmonics in pp and pPb collisions at the LHC

CMS Collaboration
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Abstract

The azimuthal anisotropy Fourier coefficients ($v_n$) in 8.16 TeV pPb data are extracted via long-range two-particle correlations as a function of event multiplicity and compared to corresponding results in pp and PbPb collisions. Using a four-particle cumulant technique, $v_n$ correlations are measured for the first time in pp and pPb collisions. The $v_2$ and $v_4$ coefficients are found to be positively correlated in all collision systems. For high multiplicity pPb collisions an anticorrelation of $v_2$ and $v_3$ is observed, with a similar correlation strength as in PbPb data at the same multiplicity. The new correlation results strengthen the case for a common origin of the collectivity seen in pPb and PbPb collisions in the measured multiplicity range.

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CMS Collaboration. 2017-09-26. Observation of correlated azimuthal anisotropy Fourier harmonics in pp and pPb collisions at the LHC. https://doi.org/10.1103/physrevlett.120.092301

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