Hanbury Brown and Twiss Interferometry with respect to 2nd and 3rd-order event planes in Au+Au collisions at = 200 GeV

30th Winter Workshop on Nuclear Dynamics

Niida, Takafumi^1

University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki

305-8571, Japan^1

关键词: Au+Au collisions;    Azimuthal angle;    Freeze out;    Gaussian sources;    Initial shape;    Ordering events;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/535/1/012001/pdf
DOI  :  10.1088/1742-6596/535/1/012001

来源: IOP

【 摘 要 】

Azimuthal angle dependence of HBT interferometry have been measured with respect to 2nd and 3rd-order event planes in Au+Au collisions at √sNN= 200 GeV at the PHENIX experiment. The 3rd-oder dependence of a Gaussian source radii was clearly observed as well as 2nd-order dependence. The result for 2nd-order indicates that the initial source eccentricity is diluted but still retain the initial shape at freeze-out, while the result for 3rd-order implies that the initial triangularity vanishes during the medium evolution, which is supported by a Gaussian source model and Monte-Carlo simulation.