Longitudinal flow decorrelations in Xe+Xe collisions at √sNN=5.44 TeV with the ATLAS detector

ATLAS Collaboration; G. Aad

doi:10.1103/PhysRevLett.126.122301

Longitudinal flow decorrelations in Xe+Xe collisions at √s_NN=5.44 TeV with the ATLAS detector

ATLAS Collaboration, G. Aad

Physics and Astronomy

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Abstract

The first measurement of longitudinal decorrelations of harmonic flow amplitudes v_n for n=2, 3 and 4 in Xe+Xe collisions at √s_NN=5.44 TeV is obtained using 3~μb⁻¹ of data with the ATLAS detector at the LHC. The decorrelation signal for v₃ and v₄ is found to be nearly independent of collision centrality and transverse momentum (p_T) requirements on final-state particles, but for v₂ a strong centrality and p_T dependence is seen. When compared with the results from Pb+Pb collisions at √s_NN=5.02 TeV, the longitudinal decorrelation signal in mid-central Xe+Xe collisions is found to be larger for v₂, but smaller for v₃. Current hydrodynamic models reproduce the ratios of the v_n measured in Xe+Xe collisions to those in Pb+Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe+Xe and Pb+Pb. These results provide new insights into the longitudinal structure of the initial-state geometry in heavy-ion collisions.

Original language	English
Article number	122301
Journal	Physical Review Letters
Volume	126
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.126.122301
Publication status	Published - 24 Mar 2021

Bibliographical note

Not yet published as of 10/03/2021.

29 pages in total, author list starting page 13, 4 figures, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-06/

Keywords

hep-ex
nucl-ex

Access to Document

10.1103/PhysRevLett.126.122301Licence: Creative Commons: Attribution (CC BY)

AadG2021Longitudinal
Aad, G. et al., 2021. Longitudinal Flow Decorrelations in Xe+Xe Collisions at sNN=5.44 TeV with the ATLAS Detector. Physical Review Letters, 126(12). Available at: http://dx.doi.org/10.1103/physrevlett.126.122301.
Final published version, 523 KBLicence: Creative Commons: Attribution (CC BY)

Cite this

@article{1387ef674b3440be9331ac1d575c5975,

title = "Longitudinal flow decorrelations in Xe+Xe collisions at √sNN=5.44 TeV with the ATLAS detector",

abstract = "The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n=2, 3 and 4 in Xe+Xe collisions at √sNN=5.44 TeV is obtained using 3~μb−1 of data with the ATLAS detector at the LHC. The decorrelation signal for v3 and v4 is found to be nearly independent of collision centrality and transverse momentum (pT) requirements on final-state particles, but for v2 a strong centrality and pT dependence is seen. When compared with the results from Pb+Pb collisions at √sNN=5.02 TeV, the longitudinal decorrelation signal in mid-central Xe+Xe collisions is found to be larger for v2, but smaller for v3. Current hydrodynamic models reproduce the ratios of the vn measured in Xe+Xe collisions to those in Pb+Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe+Xe and Pb+Pb. These results provide new insights into the longitudinal structure of the initial-state geometry in heavy-ion collisions.",

keywords = "hep-ex, nucl-ex",

author = "{ATLAS Collaboration} and G. Aad and Paul Newman",

note = "Not yet published as of 10/03/2021. 29 pages in total, author list starting page 13, 4 figures, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-06/",

year = "2021",

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doi = "10.1103/PhysRevLett.126.122301",

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journal = "Physical Review Letters",

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TY - JOUR

T1 - Longitudinal flow decorrelations in Xe+Xe collisions at √sNN=5.44 TeV with the ATLAS detector

AU - ATLAS Collaboration

AU - Aad, G.

AU - Newman, Paul

N1 - Not yet published as of 10/03/2021. 29 pages in total, author list starting page 13, 4 figures, submitted to Phys. Rev. Lett. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2019-06/

PY - 2021/3/24

Y1 - 2021/3/24

N2 - The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n=2, 3 and 4 in Xe+Xe collisions at √sNN=5.44 TeV is obtained using 3~μb−1 of data with the ATLAS detector at the LHC. The decorrelation signal for v3 and v4 is found to be nearly independent of collision centrality and transverse momentum (pT) requirements on final-state particles, but for v2 a strong centrality and pT dependence is seen. When compared with the results from Pb+Pb collisions at √sNN=5.02 TeV, the longitudinal decorrelation signal in mid-central Xe+Xe collisions is found to be larger for v2, but smaller for v3. Current hydrodynamic models reproduce the ratios of the vn measured in Xe+Xe collisions to those in Pb+Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe+Xe and Pb+Pb. These results provide new insights into the longitudinal structure of the initial-state geometry in heavy-ion collisions.

AB - The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n=2, 3 and 4 in Xe+Xe collisions at √sNN=5.44 TeV is obtained using 3~μb−1 of data with the ATLAS detector at the LHC. The decorrelation signal for v3 and v4 is found to be nearly independent of collision centrality and transverse momentum (pT) requirements on final-state particles, but for v2 a strong centrality and pT dependence is seen. When compared with the results from Pb+Pb collisions at √sNN=5.02 TeV, the longitudinal decorrelation signal in mid-central Xe+Xe collisions is found to be larger for v2, but smaller for v3. Current hydrodynamic models reproduce the ratios of the vn measured in Xe+Xe collisions to those in Pb+Pb collisions but fail to describe the magnitudes and trends of the ratios of longitudinal flow decorrelations between Xe+Xe and Pb+Pb. These results provide new insights into the longitudinal structure of the initial-state geometry in heavy-ion collisions.

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