Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-28
Phys.Lett.B702:394-397,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: Four-particle correlation added, improved discussions on the signatures of flow. v3: Improved treatment of fluctuations in
Scientific paper
10.1016/j.physletb.2011.07.031
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.
Avsar Emil
Flensburg Christoffer
Hatta Yoshitaka
Ollitrault Jean-Yves
Ueda Takahiro
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