Beam-energy dependence of spatial and temporal characteristics of shape-selected events in Au+Au collisions at STAR

4 Nov 2019, 17:40
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Collective dynamics and final state interaction Poster Session


Benjamin Schweid (Stony Brook University)


Femtoscopic measurements can be leveraged to gain insight into the expansion dynamics of the hot and dense medium created in heavy-ion collisions. This poster presentation will report and discuss excitation functions for shape-selected two-pion HBT radii ($R_{out}$, $R_{side}$ and $R_{long}$) measured for a a broad range of collision centrality and average pair transverse momentum ($k_{T}$) with the STAR detector. The shape selections were accomplished via cuts on the distributions of the second-order $Q_2$ vector [1]. The excitation functions, which span the full range of the RHIC beam energy scan ($\sqrt{s_{NN}}$ = 7.7-200 GeV), indicate clear sensitivities to the magnitude of the $Q_2$ vector which give insight into the expansion dynamics. The connection between the magnitude of the $Q_2$ vector and the spatiotemporal characteristics of the quark-gluon plasma produced in the collisions will be discussed.

[1] J. Schukraft, A. Timmins, and S. A. Voloshin, Phys. Lett. B 719 (2013) 394.

Primary author

Benjamin Schweid (Stony Brook University)

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