Measurement of the flow harmonic correlations in pp, p plus Pb and low multiplicity Pb plus Pb collisions with the ATLAS detector at the LHCShow others and affiliations
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
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-166733DOI: 10.1016/j.nuclphysa.2018.09.076ISI: 000457515500105OAI: oai:DiVA.org:su-166733DiVA, id: diva2:1296945
2019-03-182019-03-182022-03-23Bibliographically approved