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Observation of Associated Near-Side and Away-Side Long-Range Correlations in √sNN=5.02  TeV Proton-Lead Collisions with the ATLAS Detector

CollaborationWith : Abdelalim Aly, Ahmed Aly / Alexandre, Gauthier / Backes, Moritz / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bucci, Francesca / Clark, Allan Geoffrey / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Iacobucci, Giuseppe / La Rosa, Alessandro / Lister, Alison / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Nektarijevic, Snezana / Nikolics, Katalin / Pasztor, Arpad / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Rosselet, Laurent / Wu, Xin
Published in Physical Review Letters. 2013, vol. 110, no. 18, p. 182302
Abstract 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.
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ATLAS COLLABORATION. Observation of Associated Near-Side and Away-Side Long-Range Correlations in √sNN=5.02  TeV Proton-Lead Collisions with the ATLAS Detector. In: Physical Review Letters, 2013, vol. 110, n° 18, p. 182302. https://archive-ouverte.unige.ch/unige:38990

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Deposited on : 2014-07-29

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