Abstract
Two-particle correlations in relative azimuthal angle () and pseudorapidity () are measured in collisions using the ATLAS detector at the LHC. The measurements are performed using approximately of data as a function of transverse momentum () and the transverse energy () summed over in the direction of the Pb beam. The correlation function, constructed from charged particles, exhibits a long-range () “near-side” () correlation that grows rapidly with increasing . A long-range “away-side” () correlation, obtained by subtracting the expected contributions from recoiling dijets and other sources estimated using events with small , is found to match the near-side correlation in magnitude, shape (in and ) and dependence. The resultant correlation is approximately symmetric about , and is consistent with a dominant modulation for all ranges and particle .
- Received 20 December 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.182302
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© 2013 CERN, for the ATLAS Collaboration