**NONLINEAR
PHENOMENA IN COMPLEX SYSTEMS**

An Interdisciplinary Journal
* 2010, Vol.13, No.2, pp.195-201*

*v*_{2}(p_{t}) from 2D Angular Correlations and Centrality Evolution of
the Azimuth Quadrupole *p*_{t} Spectrum.

*David Kettler*
We have measured *p*_{t}-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 *v*_{2}(p_{t}), from jet correlations. Conventional
*event-plane* *v*_{2}(p_{t}) measurements can be expressed as a sum
of the azimuth quadrupole and the quadrupole component of measured
jet correlations.
%a fraction of measured jet correlations.
Quadrupole amplitudes vs *p*_{t} can be transformed to reveal
*quadrupole* *p*_{t} *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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Last updated: *July 28, 2010*