Event geometrical anisotropy and fluctuation viewed by HBT interferometry
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Azimuthal angle dependence of the pion source radii was measured applying
the event shape selection at the PHENIX experiment. The measured
final source eccentricity is found to be enhanced when selecting events with
higher magnitude of the second-order flow vector, as well as the elliptic flow
coefficient v2. The spatial twist of the particle-emitting source was also explored
using a transport model. Results indicate a possible twisted source in
the final state due to the initial longitudinal fluctuations.