| Abstract: | We present results from a harmonic decomposition of two-particle azimuthal
correlations measured with the STAR detector in Au+Au collisions for energies
ranging from $sqrt{s_{NN}}=7.7$ GeV to 200 GeV. The third harmonic
$v_3^2{2}=langle cos3(phi_1-phi_2)
angle$, where $phi_1-phi_2$ is the
angular difference in azimuth, is studied as a function of the pseudorapidity
difference between particle pairs $Deltaeta = eta_1-eta_2$. Non-zero
{vthree} is directly related to the previously observed large-$Deltaeta$
narrow-$Deltaphi$ ridge correlations and has been shown in models to be
sensitive to the existence of a low viscosity Quark Gluon Plasma (QGP) phase.
For sufficiently central collisions, $v_3^2{2}$ persist down to an energy of
7.7 GeV suggesting that QGP may be created even in these low energy collisions.
In peripheral collisions at these low energies however, $v_3^2{2}$ is
consistent with zero. When scaled by pseudorapidity density of charged particle
multiplicity per participating nucleon pair, $v_3^2{2}$ for central
collisions shows a minimum near {snn}$=20$ GeV. |
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