Journal article
Measurement of long-range pseudorapidity correlations and azimuthal harmonics in √sNN = 5.02 TeV proton-lead collisions with the ATLAS detector
Physical review. C, Nuclear physics, Vol.90(4), 044906
2014
DOI: 10.1103/PhysRevC.90.044906
Abstract
Measurements of two-particle correlation functions and the first five azimuthal harmonics, v1 to v5, are presented, using 28 nb−1 of p+Pb collisions at a nucleon-nucleon center-of-mass energy of √sNN = 5.02 TeV measured with the ATLAS detector at the LHC. Significant long-range "ridgelike" correlations are observed for pairs with small relative azimuthal angle (|Δϕ|<π/3) and back-to-back pairs (|Δϕ|>2π/3) over the transverse momentum range 0.4<pT<12 GeV and in different intervals of event activity. The event activity is defined by either the number of reconstructed tracks or the total transverse energy on the Pb-fragmentation side. The azimuthal structure of such long-range correlations is Fourier decomposed to obtain the harmonics vn as a function of pT and event activity. The extracted vn values for n=2 to 5 decrease with n. The v2 and v3 values are found to be positive in the measured pT range. The v1 is also measured as a function of pT and is observed to change sign around pT≈1.5-2.0 GeV and then increase to about 0.1 for pT>4 GeV. The v2(pT), v3(pT), and v4(pT) are compared to the vn coefficients in Pb+Pb collisions at √sNN = 2.76 TeV with similar event multiplicities. Reasonable agreement is observed after accounting for the difference in the average pT of particles produced in the two collision systems.
Details
- Title: Subtitle
- Measurement of long-range pseudorapidity correlations and azimuthal harmonics in √sNN = 5.02 TeV proton-lead collisions with the ATLAS detector
- Creators
- G Aad - Aix-Marseille UniversitéR Aben - University of AmsterdamI Angelozzi - University of AmsterdamL.J Beemster - University of AmsterdamS Bentvelsen - University of AmsterdamD Berge - University of AmsterdamG.J Bobbink - University of AmsterdamK Bos - University of AmsterdamH Boterenbrood - University of AmsterdamP Butti - University of AmsterdamA Castelli - University of AmsterdamA.P ColijnP de JongL de NooijI DeigaardC DelucaP.O DeviveirosS DhaliwalP FerrariS GadatschD.A.A GeertsF HartjesN.P HesseyN HodO IgonkinaP KluitE KoffemanH LeeF LindeJ MahlstedtJ MechnichK.P OussorenP PaniD SalekN ValencicW van den WollenbergP.C van der DeijlR van der GeerH van der GraafR van der LeeuwI van VulpenW VerkerkeJ.C VermeulenM Vranjes MilosavljevicM VreeswijkH WeitsATLAS Collaboration
- Contributors
- U Mallik (Contributor) - University of Iowa, Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- Physical review. C, Nuclear physics, Vol.90(4), 044906
- DOI
- 10.1103/PhysRevC.90.044906
- NLM abbreviation
- Phys Rev C Nucl Phys
- ISSN
- 0556-2813
- eISSN
- 1089-490X
- Publisher
- American Physical Society
- Language
- English
- Date published
- 2014
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984199683802771
Metrics
20 Record Views