Measurement with the ATLAS detector of multi-particle azimuthal correlations in p + Pb collisions at √sNN = 5.02 TeV
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Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Khalek, S. A., Abdelalim, A. A., ... & Abramowicz, H. (2013). Measurement with the ATLAS detector of multi-particle azimuthal correlations in p+ Pb collisions at sNN= 5.02 TeV. Physics Letters B, 725(1-3), 60-78. [https://doi.org/10.1016/j.physletb.2013.06.057]
SponsorshipANPCyT; YerPhI, Armenia; Australian Research Council; BMWF Austria; Austrian Science Fund (FWF); Azerbaijan National Academy of Sciences (ANAS); SSTC, Belarus; National Council for Scientific and Technological Development (CNPq); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Natural Sciences and Engineering Research Council of Canada; National Research Centre (NRC); Canada Foundation for Innovation; CERN; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Chinese Academy of Sciences; MOST; National Natural Science Foundation of China; Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic; MPO CR; Czech Republic Government; DNRF; Danish Natural Science Research Council; Lundbeckfonden; EPLANET; European Research Council (ERC); NSRF; European Union (EU); Centre National de la Recherche Scientifique (CNRS); CEA-DSM/IRFU, France; GNSF, Georgia; Federal Ministry of Education & Research (BMBF); German Research Foundation (DFG); HGF; Max Planck Society; Alexander von Humboldt Foundation; Greek Ministry of Development-GSRT; NSRF, Greece; Israel Science Foundation; MINERVA; German-Israeli Foundation for Scientific Research and Development; DIP; Benoziyo Center, Israel; Istituto Nazionale di Fisica Nucleare (INFN); Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; CNRST, Morocco; FOM (The Netherlands); Netherlands Organization for Scientific Research (NWO) Netherlands Government; BRF; RCN, Norway; Ministry of Science and Higher Education, Poland; GRICES; Portuguese Foundation for Science and Technology; MERYS (MECTS), Romania; MES of Russia; Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; Slovenian Research Agency - Slovenia; MVZT, Slovenia; DST/NRF, South Africa; Spanish Government; SRC; Wallenberg Foundation, Sweden; SER; Swiss National Science Foundation (SNSF); Cantons of Bern; Geneva, Switzerland; National Science Council of Taiwan; Ministry of Energy & Natural Resources - Turkey; Royal Society of London; Leverhulme Trust; United States Department of Energy (DOE); National Science Foundation (NSF); Science & Technology Facilities Council (STFC) ST/M001431/1 ST/M000761/1 ST/K001361/1 LHCb ST/K001337/1 PP/E003699/1 ST/I000186/1 ST/L000970/1 ATLAS Upgrades ST/K001329/1 ATLAS ST/K003437/1 GRIDPP ST/M000664/1 ST/K001264/1 ATLAS PP/E002757/1 ST/I005811/1 ST/J002798/1 ST/K00140X/1 ST/K00140X/1 ATLAS ST/K001361/1 LHCb Upgrades ST/H001042/2 PP/E003699/2 ST/L001004/1 ST/K501840/1 GRIDPP ST/K003658/1 ST/K003437/1 ST/K501840/1 ST/I006080/1 ST/H00095X/2 ST/H001042/1 ST/I005803/1 GRIDPP ST/K001361/1 ATLAS ST/K001361/1 ST/K003496/1 GRIDPP ST/L000970/1 ST/I003142/1 ST/K000659/1 ST/J501074/1 ST/J004944/1 ST/H001069/2 ST/J500641/1 ST/J005568/1 ST/J005533/1 PP/E003087/1 ST/L001209/1 ATLAS Upgrades ST/K003658/1 GRIDPP ST/K001388/1 ST/I505756/1 ST/H001093/1 ST/F00754X/1 ST/K001337/1 ATLAS ST/H001093/2 PP/E000347/1 GRIDPP ST/L001144/1 ST/F007337/1 ST/H00095X/1 ST/K001361/1 ATLAS Upgrades ST/K001361/1 MINOS/MINOS+ ST/J005541/1 ST/K00073X/1 ST/K001396/1 ATLAS ST/J005460/1 ST/I003517/1 ST/I005803/1 ST/J004928/1 ST/L000970/1 ATLAS Upgrade ST/J004928/1 ATLAS Upgrades ST/K000713/1 ST/F007418/1 ST/K50208X/1 ST/K00137X/1 ST/L003325/1 ST/L00352X/1 PP/E000487/1 ST/K001248/1 ST/J004928/1 ATLAS Upgrade ST/J004936/1 ST/J005576/1 ATLAS ST/G502320/1 ST/K003496/1; ICREA
In order to study further the long-range correlations (“ridge”) observed recently in p + Pb collisions at √sNN = 5.02 TeV, the second-order azimuthal anisotropy parameter of charged particles, v2, has been measured with the cumulant method using the ATLAS detector at the LHC. In a data sample corresponding to an integrated luminosity of approximately 1 μb−1, the parameter v2 has been obtained using two- and four-particle cumulants over the pseudorapidity range |η| < 2.5. The results are presented as a function of transverse momentum and the event activity, defined in terms of the transverse energy summed over 3.1 < η < 4.9 in the direction of the Pb beam. They show features characteristic of collective anisotropic flow, similar to that observed in Pb+ Pb collisions. A comparison is made to results obtained using two-particle correlation methods, and to predictions from hydrodynamic models of p +Pb collisions. Despite the small transverse spatial extent of the p + Pb collision system, the large magnitude of v2 and its similarity to hydrodynamic predictions provide additional evidence for the importance of final-state effects in p + Pb reactions.