## Measurement of longitudinal flow decorrelations in Pb plus Pb collisions at root s(NN)=2.76 and 5.02 TeV with the ATLAS detector

Please always quote using this URN: urn:nbn:de:bvb:20-opus-225610

- Measurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range vertical bar eta vertical bar < 2.4 using 7 mu b(-1) and 470 mu b(-1) of Pb+Pb collisions at root s(NN) = 2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients v(n) measured in two separated eta intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increasesMeasurements of longitudinal flow correlations are presented for charged particles in the pseudorapidity range vertical bar eta vertical bar < 2.4 using 7 mu b(-1) and 470 mu b(-1) of Pb+Pb collisions at root s(NN) = 2.76 and 5.02 TeV, respectively, recorded by the ATLAS detector at the LHC. It is found that the correlation between the harmonic flow coefficients v(n) measured in two separated eta intervals does not factorise into the product of single-particle coefficients, and this breaking of factorisation, or flow decorrelation, increases linearly with the eta separation between the intervals. The flow decorrelation is stronger at 2.76 TeVthan at 5.02 TeV. Higher-order moments of the correlations are also measured, and the corresponding linear coefficients for the kth-moment of the v(n) are found to be proportional to k for v(3), but not for v(2). The decorrelation effect is separated into contributions from the magnitude of v(n) and the event-plane orientation, each as a function of eta. These two contributions are found to be comparable. The longitudinal flow correlations are also measured between v(n) of different order in n. The decorrelations of v(2) and v(3) are found to be independent of each other, while the decorrelations of v(4) and v(5) are found to be driven by the nonlinear contribution from v(2)(2) and v(2)v(3), respectively.…

URN: | urn:nbn:de:bvb:20-opus-225610 |
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Document Type: | Journal article |

Faculties: | Fakultät für Physik und Astronomie / Physikalisches Institut |

Language: | English |

Parent Title (English): | The European Physical Journal C |

Year of Completion: | 2018 |

Volume: | 78 |

Issue: | 142 |

Pagenumber: | 1-37 |

Source: | Eur. Phys. J. C 78, 142 (2018). doi:10.1140/epjc/s10052-018-5605-7 |

DOI: | https://doi.org/10.1140/epjc/s10052-018-5605-7 |

Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |

Tag: | Charged-Particles; Dependence; Pseudorapidity; Viscosity |

Release Date: | 2023/08/29 |

Creating Corporation: | The ATLAS Collaboration |

Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |