Elliptic flow from two- and four-particle correlations in Au + Au collisions at sqrt{s_{NN}} = 130 GeV

By C. Adler, Z. Ahammed, C. Allgower, J. Amonett, B. Anderson, M. Anderson, G. S. Averichev, J. Balewski, O. Barannikova, L. Barnby and 287 more. 2002

280 citations recorded by the source corpus.

Elliptic flow holds much promise for studying the early-time thermalization attained in ultrarelativistic nuclear collisions. Flow measurements also provide a means of distinguishing between hydrodynamic models and calculations which approach the low density (dilute gas) limit. Among the effects that can complicate the interpretation of elliptic flow measurements are azimuthal correlations that are unrelated to the reaction plane (non-flow correlations). Using data for Au + Au collisions at sqrt{s_{NN}} = 130 GeV from the STAR TPC, it is found that four-particle correlation analyses can reliably separate flow and non-flow correlation signals. The latter account for on average about 15% of the observed second-harmonic azimuthal correlation, with the largest relative contribution for the most peripheral and the most central collisions. The results are also corrected for the effect of flow variations within centrality bins. This effect is negligible for all but the most central bin, where the correction to the elliptic flow is about a factor of two. A simple new method for two-particle flow analysis based on scalar products is described. An analysis based on the distribution of the magnitude of the flow vector is also described.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/139f21e1f1bfe95c57ff2b00185aaf53e52ec4b2

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In Nuclear and High Energy Physics

Citations in the corpus

Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions (2015, methodology): “The second coefficient, v2 or elliptic flow, which is the dominant component of the anisotropy in non-central nucleus–nucleus collisions, is measured using these three methods: event plane (EP) [493], scalar product (SP) [494] and multi-particle cumulants [495].”
Elliptic flow of electrons from heavy-flavour hadron decays at mid-rapidity in Pb-Pb collisions at √sNN=2.76 TeV (2016, methodology): “The measurement of the elliptic ﬂow with the scalar product method [66, 67], a two particle correlation technique, is given by: where M A and M B are the multiplicities and of two sub-events A and B, determined from TPC tracks in the positive (0 h 0.8) and negative ( 0.8 h 0) pseudorapidity…”