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Angular correlations measured in \pp and heavy ion collisions at theRelativistic Heavy Ion Collider (RHIC) include a same-side (SS) 2D peak. Inperipheral \aa and p-p collisions the SS peak properties are consistent withpredicted minimum-bias jet correlations. However, in more-central \auaucollisions the SS peak becomes elongated on pseudorapidity $\eta$. Argumentshave been proposed to explain the SS peak $\eta$ elongation in terms ofpossibly-fluctuating initial-state geometry multipoles coupled with radial flowto produce final-state momentum-space multipoles. Such arguments are based onFourier decomposition of 2D angular correlations projected onto 1D azimuth. Inthis analysis we show that measured correlation structure on $\eta$ (largecurvatures) establishes a clear distinction between the SS 2D (jet) peak and 1Dmultipoles. Measured 2D peak systematics can predict inferred 1D Fourieramplitudes interpreted as "higher harmonic flows." But 1D Fourier amplitudesalone cannot describe 2D angular correlations. The SS 2D peak remains a uniquestructure which can be interpreted in terms of parton scattering andfragmentation in all cases.

Azimuth multipoles vs minimum-bias jets in 2D angular correlations on $\eta$ and $\phi$