Observation of Associated Near-Side and Away-Side Long-Range Correlations in √[subscript NN]=5.02 TeV Proton-Lead Collisions with the ATLAS Detector
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[...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/79918 https://orcid.org/0000-0002-7586-7253 |
| Summary: | 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]. |
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