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Measurement of the flow harmonic correlations in pp, p+Pb and low multiplicity Pb+Pb collisions with the ATLAS detector at the LHC
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0002-1253-8583
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 29192019 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 982, p. 479-482Article in journal (Refereed) Published
Abstract [en]

Recent measurements of the correlations between flow harmonics obtained using four-particle symmetric cumulants and three-particle asymmetric cumulants with the ATLAS detector at the LHC are described. The data sets of pp, p+Pb and peripheral Pb+Pb collisions at various energies are analyzed, aiming to probe the long-range collective nature of multi-particle production in small systems. The sensitivity of the standard cumulant method to non-flow correlations is investigated by introducing the subevents method. A systematic reduction of non-flow effects is observed when using the two-subevent method. Further reduction is observed with the three-subevent method that is consistent with the results obtained with the four-subevent one. A negative correlation between v(2) and v(3) and a positive correlation between v(2) and v(4), for all studied collision systems and over full multiplicity range, is observed. The correlation strength computed as symmetric cumulants normalized by the < v(n)(2)> is similar for all collision systems and weakly depends on multiplicity. These measurements provide new evidence for long-range multi-particle collectivity in small collision systems and quantify the nature of its event-by-event fluctuations.

Place, publisher, year, edition, pages
2019. Vol. 982, p. 479-482
Keywords [en]
QGP, heavy ion collisions, small systems, collectivity, symmetric cumulants, subevent cumulants
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-378202DOI: 10.1016/j.nuclphysa.2018.09.076ISI: 000457515500105OAI: oai:DiVA.org:uu-378202DiVA, id: diva2:1294216
Conference
XXVIIth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018)
Note

For complete list of authors see http://dx.doi.org/10.1016/j.nuclphysa.2018.09.076

Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-03-06Bibliographically approved

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Asimakopoulou, Eleni M.Bergeås Kuutmann, ElinBokan, PetarBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P. O. JoakimIsacson, MaxMårtensson, Mikael U. F.Sales De Bruin, Pedro

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Derendarz, DominikAsimakopoulou, Eleni M.Bergeås Kuutmann, ElinBokan, PetarBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P. O. JoakimIsacson, MaxMårtensson, Mikael U. F.Sales De Bruin, Pedro
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Nuclear Physics A
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