Eccentricity and elliptic flow in proton-proton collisions from parton evolution

Emil Avsar, Christoffer Flensburg, Yoshitaka Hatta, Jean-Yves Ollitrault, Takahiro Ueda

Research output: Contribution to journalArticlepeer-review


It has been argued that high-multiplicity proton-proton collisions at the LHC may exhibit collective phenomena usually studied in the context of heavy-ion collisions, such as elliptic flow. We study this issue using DIPSY-a Monte Carlo event generator based on the QCD dipole model. We calculate the eccentricity of the transverse area defined by the spatial distribution of produced gluons. The resulting elliptic flow is estimated to be about 6%, comparable to the value in nucleus-nucleus collisions at RHIC and the LHC. Experimentally, elliptic flow is inferred from the azimuthal correlation between hadrons, which receives contributions from collective flow, and from various other effects referred to as "nonflow". We discuss how to identify in experiments the signal of flow in the presence of large nonflow effects. (C) 2011 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)394-397
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number5
Publication statusPublished - 2011

Subject classification (UKÄ)

  • Subatomic Physics


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