# Observation of Correlated Azimuthal Anisotropy Fourier Harmonics in pp and p+Pb Collisions at the LHC

## Abstract

The azimuthal anisotropy Fourier coefficients $(vn)$ in $8.16 TeV p+Pb$ data are extracted via long-range two-particle correlations as a function of the 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 $p+Pb$ collisions. The$v2$ and $v4$ coefficients are found to be positively correlated in all collision systems. For high-multiplicity $p+Pb$ collisions, an anticorrelation of $v2$ and $v3$ 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 $p+Pb$ and $PbPb$ collisions in the measured multiplicity range.

## Abstract

The azimuthal anisotropy Fourier coefficients $(vn)$ in $8.16 TeV p+Pb$ data are extracted via long-range two-particle correlations as a function of the 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 $p+Pb$ collisions. The$v2$ and $v4$ coefficients are found to be positively correlated in all collision systems. For high-multiplicity $p+Pb$ collisions, an anticorrelation of $v2$ and $v3$ 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 $p+Pb$ and $PbPb$ collisions in the measured multiplicity range.

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## Additional indexing

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics Physical Sciences > General Physics and Astronomy English 2018 06 Mar 2019 10:19 29 Jul 2020 08:43 American Physical Society 0031-9007 Hybrid https://doi.org/10.1103/PhysRevLett.120.092301

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