Final source eccentricity measured by HBT interferometry with the event shape selection

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Niida, Takafumi^1

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

305-8571, Japan^1

关键词: Azimuthal angle;    Engineering techniques;    Final state;    Pion sources;    Second order flows;    Source distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012043/pdf
DOI  :  10.1088/1742-6596/612/1/012043

来源: IOP

【 摘 要 】

Azimuthal angle dependence of the pion source radii has been measured applying the event shape engineering technique at the PHENIX experiment. When events with higher magnitude of second-order flow vector are selected, the oscillation of the source radii is enhanced as well as v2which leads to the enhancement of the measured final source eccentricity. The event twist effect in the spatial source distribution in the final state has been also explored with AMPT model. Results indicate a possible twisted source due to the initial longitudinal fluctuations.