Observation of Associated Near-Side and Away-Side Long-Range Correlations in √[subscript NN]=5.02 TeV Proton-Lead Collisions with the ATLAS Detector
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Aad-2013-Observation of Associated Near-Side and Away-Side Long-Range.pdf
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Author(s)
Taylor, Frank E.
Date Issued
May 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. “Observation of Associated Near-Side and Away-Side Long-Range Correlations in sqrt[s_{NN}]=5.02 TeV Proton-Lead Collisions with the ATLAS Detector.” Physical Review Letters 110, no. 18 (May 2013). © 2013 CERN
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Final published version
Abstract
Two-particle correlations in relative azimuthal angle (Δϕ) and pseudorapidity (Δη) are measured in √s[subscript NN]=5.02 TeV p+Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 μb[superscript -1] of data as a function of transverse momentum (p[subscript T]) and the transverse energy (ΣE[Pb over T]) 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 ΣE[Pb over T]. 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 ΣE[Pb over T], is found to match the near-side correlation in magnitude, shape (in Δη and Δϕ) and ΣE[Pb over T] dependence. The resultant Δϕ correlation is approximately symmetric about π/2, and is consistent with a dominant cos2Δϕ modulation for all ΣE[Pb over T] ranges and particle p[subscript T].
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.182302
