TY  - JOUR
A1  - Reichert, Tom Andre
A1  - Savchuk, Oleh
A1  - Kittiratpattana, Apiwit
A1  - Li, Pengcheng
A1  - Steinheimer, Jan
A1  - Gorenstein, Mark I.
A1  - Bleicher, Marcus
T1  - Decoding the flow evolution in Au+Au reactions at 1.23A GeV using hadron flow correlations and dileptons
T2  - Physics Letters B
N2  - We investigate the development of the directed, v1, and elliptic flow, v2, in heavy ion collisions in mid-central Au+Au reactions at Elab=1.23A GeV. We demonstrate that the elliptic flow of hot and dense matter is initially positive (v2>0) due to the early pressure gradient. This positive v2 transfers its momentum to the spectators, which leads to the creation of the directed flow v1. In turn, the spectator shadowing of the in-plane expansion leads to a preferred decoupling of hadrons in the out-of-plane direction and results in a negative v2 for the observable final state hadrons. We propose a measurement of v1−v2 flow correlations and of the elliptic flow of dileptons as methods to pin down this evolution pattern. The elliptic flow of the dileptons allows then to determine the early-state EoS more precisely, because it avoids the strong modifications of the momentum distribution due to shadowing seen in the protons. This opens the unique opportunity for the HADES and CBM collaborations to measure the Equation-of-State directly at 2-3 times nuclear saturation density.
Y1  - 2023
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/78982
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-789829
SN  - 0370-2693
VL  - 841
IS  - 137947
PB  - Elsevier
CY  - Amsterdam
ER  -