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We present results of analyses of two-pion interferometry in Au+Au collisionsat $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV measured in theSTAR detector as part of the RHIC Beam Energy Scan program. The extractedcorrelation lengths (HBT radii) are studied as a function of beam energy,azimuthal angle relative to the reaction plane, centrality, and transverse mass($m_{T}$) of the particles. The azimuthal analysis allows extraction of theeccentricity of the entire fireball at kinetic freeze-out. The energydependence of this observable is expected to be sensitive to changes in theequation of state. A new global fit method is studied as an alternate method todirectly measure the parameters in the azimuthal analysis. The eccentricityshows a monotonic decrease with beam energy that is qualitatively consistentwith the trend from all model predictions and quantitatively consistent with ahadronic transport model.

Beam energy dependent two-pion interferometry and the freeze-out eccentricity of pions in heavy ion collisions at STAR