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Title: Measurement of the flow harmonic correlations in pp, p+Pb and low multiplicity Pb+Pb collisions with the ATLAS detector at the LHC

Abstract

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 ν 2 and ν 3 and a positive correlation between ν 2 and ν 4, for all studied collision systems and over full multiplicity range, is observed. The correlation strength computed as symmetric cumulants normalized by < v 2 n >the is similar for all collision systems and weakly depends on multiplicity. In conclusion, 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.

Authors:
ORCiD logo [1]
  1. Institute of Nuclear Physics PAS, Krakow (Poland)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1503106
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 982; Journal Issue: C; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; QGP; heavy ion collisions; small systems; collectivity; symmetric cumulants; subevent cumulants

Citation Formats

Derendarz, Dominik. Measurement of the flow harmonic correlations in pp, p+Pb and low multiplicity Pb+Pb collisions with the ATLAS detector at the LHC. United States: N. p., 2019. Web. doi:10.1016/j.nuclphysa.2018.09.076.
Derendarz, Dominik. Measurement of the flow harmonic correlations in pp, p+Pb and low multiplicity Pb+Pb collisions with the ATLAS detector at the LHC. United States. doi:10.1016/j.nuclphysa.2018.09.076.
Derendarz, Dominik. Tue . "Measurement of the flow harmonic correlations in pp, p+Pb and low multiplicity Pb+Pb collisions with the ATLAS detector at the LHC". United States. doi:10.1016/j.nuclphysa.2018.09.076. https://www.osti.gov/servlets/purl/1503106.
@article{osti_1503106,
title = {Measurement of the flow harmonic correlations in pp, p+Pb and low multiplicity Pb+Pb collisions with the ATLAS detector at the LHC},
author = {Derendarz, Dominik},
abstractNote = {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 ν2 and ν3 and a positive correlation between ν2 and ν4, for all studied collision systems and over full multiplicity range, is observed. The correlation strength computed as symmetric cumulants normalized by < v2n >the is similar for all collision systems and weakly depends on multiplicity. In conclusion, 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.},
doi = {10.1016/j.nuclphysa.2018.09.076},
journal = {Nuclear Physics. A},
issn = {0375-9474},
number = C,
volume = 982,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
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Figures / Tables:

Figure 1 Figure 1: The symmetric cumulants sc2,3{4} (left column), sc2,4{4} (middle column) and asymmetric cumulant ac2{3} (right column) as a function of 〈Nch〉 obtained for pp collisions (top row), p+Pb collisions (middle row) and low-multiplicity Pb+Pb collisions (bottom row) [9]. In each panel, the results are obtained from the standard methodmore » (filled symbols), the two-subevent method (open circles), three-subevent method (open squares) and in the case of symmetric cumulants four-subevent method (open diamonds). The error bars and shaded boxes represent the statistical and systematic uncertainties, respectively.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.