Non-flow correlations in a cluster model
Quan Wang, Fuqiang Wang
TL;DR
This paper derives analytical expressions for nonflow effects in elliptic flow measurements, assesses contributions from rho decays and STAR data, and finds these effects are generally small but analytically characterized.
Contribution
It provides the first analytical forms for nonflow contributions from cluster correlations in elliptic flow analysis.
Findings
Nonflow from rho->pi+pi decays is negative but minor.
Analytical forms for nonflow contributions are derived.
Nonflow effects from STAR measurements are estimated.
Abstract
We derive analytical forms for nonflow contributions from cluster correlation to the measurement of two-particle elliptic flow (v2{2}). We estimate nonflow contribution from rho->pi+pi decays and find it is negative but not a major contributor to the nonflow effect in v2{2}. We also estimate nonflow contribution from the recent STAR measurement of two-particle angular correlations.
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