2010, Vol.13, No.2, pp.195-201
We have measured pt-dependent two-particle number correlations
on azimuth and pseudorapidity for eleven centralities of 200 GeV
Au-Au collisions at STAR. 2D fits to these angular correlations
isolate the azimuth quadrupole amplitude, which is closely related
to v2(pt), from jet correlations. Conventional
event-plane v2(pt) measurements can be expressed as a sum
of the azimuth quadrupole and the quadrupole component of measured
%a fraction of measured jet correlations.
Quadrupole amplitudes vs pt can be transformed to reveal
quadrupole pt spectra which exhibit a fixed transverse boost
and universal Lévy form nearly independent of centrality.
Key words: elliptic flow, hydrodynamics, RHIC, quadrupole, minijets, correlations
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