Measurements of long-range near-side angular correlations in √sNN = 5 TeV proton-lead collisions in the forward region
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1-s2.0-S037026931630572X-main.pdf
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40de00947cf27a4da2814660042f6909
Author(s)
Ilten, Philip J
Williams, Michael
Date Issued
November 2016
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Aaij, R., et al. “Measurements of Long-Range near-Side Angular Correlations in √sNN = 5 TeV Proton-Lead Collisions in the Forward Region.” Physics Letters B, vol. 762, Nov. 2016, pp. 473–83. © 2016 The Authors
Version
Final published version
Abstract
Two-particle angular correlations are studied in proton-lead collisions at a nucleon–nucleon centre-of-mass energy of √sNN=5 TeV, collected with the LHCb detector at the LHC. The analysis is based on data recorded in two beam configurations, in which either the direction of the proton or that of the lead ion is analysed. The correlations are measured in the laboratory system as a function of relative pseudorapidity, Δη, and relative azimuthal angle, Δϕ, for events in different classes of event activity and for different bins of particle transverse momentum. In high-activity events a long-range correlation on the near side, Δϕ≈0, is observed in the pseudorapidity range 2.0<η<4.9. This measurement of long-range correlations on the near side in proton-lead collisions extends previous observations into the forward region up to η=4.9. The correlation increases with growing event activity and is found to be more pronounced in the direction of the lead beam. However, the correlation in the direction of the lead and proton beams are found to be compatible when comparing events with similar absolute activity in the direction analysed.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2016.09.064
