Observation of Associated Near-Side and Away-Side Long-Range Correlations in √sNN=5.02 TeV Proton-Lead Collisions with the ATLAS Detector
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American Physical Society
Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Khalek, S. A., Abdelalim, A. A., ... & Abramowicz, H. (2013). Observation of associated near-side and away-side long-range correlations in s N N= 5.02 TeV proton-lead collisions with the ATLAS detector. Physical review letters, 110(18), 182302. [https://doi.org/10.1103/PhysRevLett.110.182302]
SponsorshipANPCyT ; YerPhI, Armenia; Australian Research Council; BMWF, Austria; 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; NRC, Canada; Canada Foundation for Innovation; CERN; Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT); Chinese Academy of Sciences; Ministry of Science and Technology, China; National Natural Science Foundation of China; Departamento Administrativo de Ciencia, Tecnologia e Innovacion Colciencias; Ministry of Education, Youth & Sports - Czech Republic Czech Republic Government; DNRF, Denmark; Danish Natural Science Research Council; Lundbeckfonden; European Union (EU); European Union (EU) European Research Council (ERC); Centre National de la Recherche Scientifique (CNRS); CEA-DSM/IRFU, France; GNAS, Georgia; Federal Ministry of Education & Research (BMBF); German Research Foundation (DFG); HGF, Germany; Max Planck Society; Alexander von Humboldt Foundation; Greek Ministry of Development-GSRT; Israel Science Foundation; MINERVA, Israel; German-Israeli Foundation for Scientific Research and Development; DIP, Israel; 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 Government; Netherlands Organization for Scientific Research (NWO) Netherlands Government; RCN, Norway; Ministry of Science and Higher Education, Poland; GRICES, Portugal; 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, Sweden; Wallenberg Foundation, Sweden; SER, Switzerland; Swiss National Science Foundation (SNSF); Cantons of Bern, Switzerland; 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); ATLAS Tier-1 facilities at TRIUMF (Canada); NDGF (Denmark); NDGF (Norway); NDGF (Sweden); CC-IN2P3 (France); KIT/GridKA (Germany); INFN-CNAF (Italy); Netherlands Government; PIC (Spain); ASGC (Taiwan); RAL (UK); BNL (USA); Tier-2 facilities worldwide; ICREA; Science & Technology Facilities Council (STFC) ST/F00754X/1 ST/J005568/1 ST/K001361/1 LHCb ST/H00100X/2 ST/K001329/1 ST/K00140X/1 ST/K003437/1 ST/L000970/1 ST/K001329/1 ATLAS ST/K001310/1 LHCb ST/K001310/1 ATLAS ST/K003658/1 ST/J005576/1 ST/J005460/1 ST/G502320/1 ST/J004928/1 ST/I003517/1 ST/H001042/1 ST/K001361/1 ST/J004936/1 ST/I005811/1 ST/H001093/2 ST/K000705/1 ST/L003112/1 ST/H001069/2 ST/H001093/1 ST/M000664/1 ST/K001426/1 ATLAS ST/K001361/1 ATLAS ST/J004928/1 ATLAS Upgrades ST/I005803/1 GRIDPP ST/J501074/1 PP/E002757/1 PP/E000355/1 ST/K001361/1 ATLAS Upgrades ST/I000186/1 PP/E003087/1 ST/K000659/1 ST/K003496/1 GRIDPP ST/K501840/1 ST/L001195/1 ST/F007418/1 ST/I005803/1 ST/J005541/1 PP/E000487/1 ST/K00073X/1 ST/K001264/1 ATLAS ST/L000970/1 ATLAS Upgrades ST/L000970/1 ATLAS Upgrade ST/M000761/1 ST/K50208X/1 ST/K001310/1 ATLAS Upgrades ST/K001388/1 ST/K501840/1 GRIDPP ST/H00100X/1 ST/I003142/1 ST/K001248/1 ATLAS ST/J004928/1 ATLAS Upgrade ST/I006080/1 ST/K003496/1 ST/K000713/1 PP/E000347/1 GRIDPP ST/K001310/1 LHCb Upgrades ST/K003437/1 GRIDPP ST/L001144/1 ST/L00352X/1 ST/M001431/1 ST/K00137X/1 ST/K001361/1 MINOS/MINOS+ ST/K001361/1 LHCb Upgrades ST/I003525/1 ST/H001042/2 ST/H00095X/1 ST/I505756/1 ST/K003658/1 GRIDPP ST/J005533/1 ST/J004944/1 ST/J004804/1 ST/K001248/1 ST/K001337/1 ATLAS ST/K001310/1 ST/L003325/1 ATLAS ST/H00095X/2 ST/K00140X/1 ATLAS
Two-particle correlations in relative azimuthal angle (Δϕ) and pseudorapidity (Δη) are measured in √sNN=5.02 TeV p+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 μb−1 of data as a function of transverse momentum (pT) and the transverse energy (ΣEPbT) summed over 3.1<η<4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2<|Δη|<5) “near-side” (Δϕ∼0) correlation that grows rapidly with increasing ΣEPbT. A long-range “away-side” (Δϕ∼π) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small ΣEPbT, is found to match the near-side correlation in magnitude, shape (in Δη and Δϕ) and ΣEPbT dependence. The resultant Δϕ correlation is approximately symmetric about π/2, and is consistent with a dominant cos2Δϕ modulation for all ΣEPbT ranges and particle pT.