Observation of Associated Near-Side and Away-Side Long-Range Correlations in root S-NN=5.02 TeV Proton-Lead Collisions with the ATLAS Detector
Number of Authors: 2952
2013 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 10, no 18, 182302- p.Article in journal (Refereed) Published
Two-particle correlations in relative azimuthal angle (Delta phi) and pseudorapidity (Delta eta) are measured in root S-NN = 5.02 TeV p + Pb collisions using the ATLAS detector at the LHC. The measurements are performed using approximately 1 mu b(-1) of data as a function of transverse momentum (p(T)) and the transverse energy (Sigma E-T(Pb)) summed over 3.1 < eta < 4.9 in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range (2 < vertical bar Delta eta vertical bar < 5) "near-side" (Delta phi similar to 0) correlation that grows rapidly with increasing Sigma E-T(Pb). A long-range "away-side" (Delta phi similar to pi) correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small Sigma E-T(Pb), is found to match the near-side correlation in magnitude, shape (in Delta eta and Delta phi) and Sigma E-T(Pb) dependence. The resultant Delta phi correlation is approximately symmetric about pi/2, and is consistent with a dominant cos2 Delta phi modulation for all Sigma E-T(Pb) ranges and particle p(T).
Place, publisher, year, edition, pages
2013. Vol. 10, no 18, 182302- p.
IdentifiersURN: urn:nbn:se:kth:diva-124270DOI: 10.1103/PhysRevLett.110.182302ISI: 000319019300005ScopusID: 2-s2.0-84877136220OAI: oai:DiVA.org:kth-124270DiVA: diva2:633983
Author count: 2952. QC 201306282013-06-282013-06-282013-06-28Bibliographically approved