Long-range correlations in proton-lead collisions at = 5.02 TeV from ATLAS

29th Winter Workshop on Nuclear Dynamics

Jia, Jiangyong^1,2

Chemistry Department, Stony Brook University, Stony Brook, NY 11794, United States^1

Physics Department, Brookhaven National Laboratory, Upton, NY 11796, United States^2

关键词: ATLAS detectors;    Correlation analysis;    Heavy ion collision;    Long range correlations;    Momentum conservations;    Pseudorapidities;    Relative azimuth;    Two particle correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/458/1/012023/pdf
DOI  :  10.1088/1742-6596/458/1/012023

来源: IOP

【 摘 要 】

Two-particle correlations in relative azimuth Δφand relative pseudorapidity Δη are studied in p+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector at LHC. The correlations are studied as a function of charged particle pTand the collision ΣEPbTsummed over 3.1 PbT, the resulting correlations exhibit a Δφ modulation that is flat in Δη out to |Δη| 5. The modulation is comparable in magnitude to similar modulations observed in heavy ion collisions, and can be described by a 1 + 2c2cos 2Δφ + 2c3cos 3Δφ function over 0.5 TPbT. The correlation analysis is repeated for event classes defined by the number of reconstructed charged particles Nrecch. This analysis gives nearly the same result as the analysis based on ΣEPbTfor the long-range correlation at the near-side (Δφ ∼ 0), but leads to biases in the long-range correlations at the away-side (Δφ ∼ π). HIJING simulation suggests that this bias is mainly associated with the contributions from dijets which are correlated strongly with the Nrecch.