Journal
PHYSICAL REVIEW C
Volume 103, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.103.014902
Keywords
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- BMBWF (Austria)
- FWF (Austria)
- FNRS (Belgium)
- FWO (Belgium)
- CNPq (Brazil)
- CAPES (Brazil)
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- CERN
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- ERDF (Estonia)
- Academy of Finland (Finland)
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- TUBITAK (Turkey)
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- DOE (USA)
- NSF (USA)
- Marie Curie programme (European Union)
- European Research Council (European Union) [675440, 765710]
- Horizon 2020 Grant (European Union) [675440, 765710]
- Leventis Foundation
- A. P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office
- Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium)
- F. R. S.-FNRS (Belgium) under the Excellence of Science -EOS -be.h Project [30820817]
- FWO (Belgium) under the Excellence of Science -EOS -be.h Project [30820817]
- Beijing Municipal Science & Technology Commission [Z181100004218003]
- Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
- Lendulet (Momentum) Programme of the Hungarian Academy of Sciences (Hungary)
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences (Hungary)
- New National Excellence Program UNKP (Hungary)
- NKFIA (Hungary) [123842, 123959, 124845, 124850, 125105, 128713, 128786, 129058]
- Council of Science and Industrial Research, India
- HOMING PLUS programme of the Foundation for Polish Science
- European Union
- Regional Development Fund
- Mobility Plus programme of the Ministry of Science and Higher Education
- National Science Center (Poland) [Harmonia 2014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, 2015/19/B/ST2/02861, Sonata-bis 2012/07/E/ST2/01406]
- National Priorities Research Program by Qatar National Research Fund
- Programa Estatal de Fomento de la Investigacion Cientifica y Tecnica de Excelencia Maria de Maeztu [MDM-2015-0509]
- Programa Severo Ochoa del Principado de Asturias
- Thalis programme - EU-ESF
- Aristeia programme - EU-ESF
- Greek NSRF
- Rachadapisek Sompot Fund for Postdoctoral Fellowship (Thailand)
- Chulalongkorn University (Thailand)
- Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand)
- Welch Foundation [C-1845]
- Weston Havens Foundation (USA)
- STFC [ST/S00078X/1, ST/S000739/1] Funding Source: UKRI
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Long-range correlations of azimuthal anisotropy Fourier coefficients (v(n)) in 8.16 TeV pPb data were extracted using a subevent four-particle cumulant technique applied to very low multiplicity events. The v(2) and v(3) coefficients exhibit an anticorrelation at high multiplicities, and the correlation strength of v(2) and v(4) depends on the number of subevents used in the calculation. Results from different subevent methods diverge as event multiplicity decreases due to different contributions of noncollective or few-particle correlations.
Event-by-event long-range correlations of azimuthal anisotropy Fourier coefficients (v(n)) in 8.16 TeV pPb data, collected by the CMS experiment at the CERN Large Hadron Collider, are extracted using a subevent four-particle cumulant technique applied to very low multiplicity events. Each combination of four charged particles is selected from either two, three, or four distinct subevent regions of a pseudorapidity range from -2.4 to 2.4 of the CMS tracker, and with transverse momentum between 0.3 and 3.0 GeV. Using the subevent cumulant technique, correlations between v(n) of different orders are measured as functions of particle multiplicity and compared to the standard cumulant method without subevents over a wide event multiplicity range. At high multiplicities, the v(2) and v(3) coefficients exhibit an anticorrelation; this behavior is observed consistently using various methods. The v(2) and v(4) correlation strength is found to depend on the number of subevents used in the calculation. As the event multiplicity decreases, the results from different subevent methods diverge because of different contributions of noncollective or few-particle correlations. Correlations extracted with the four-subevent method exhibit a tendency to diminish monotonically toward the lowest multiplicity region (about 20 charged tracks) investigated. These findings extend previous studies to a significantly lower event multiplicity range and establish the evidence for the onset of long-range collective multiparticle correlations in small system collisions.
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