Speaker
Behruz Kardan
(IKF, Goethe-Universität Frankfurt)
Description
HADES has a large acceptance combined with a good mass-resolution and good particle-identification capability, and is well equipped to study the azimuthal flow pattern not only for protons and charged pions, but also for lambdas, kaons, $\phi$-mesons and electrons-positron pairs, as well as deuterons, tritons and light nuclear fragments. With the statistics of seven billion Au-Au collisions at 1.23A GeV recorded in 2012, a multi-differential ($p_{t}$, rapidity, centrality) investigation with unprecedented precision is possible.
At the BEVALAC and SIS18 directed and elliptic flow has been measured for pions, charged kaons, protons, neutrons and fragments, but higher-order harmonics have not yet been studied. They provide additional information on the properties of the dense hadronic medium produced in heavy-ion collisions, such as its viscosity, and provide thus an important reference to measurements at higher energies. We present here a high-statistics, multi-differential measurement of radial flow, obtained with blast wave fit analysis, and of $v_{1}$, $v_{2}$ and $v_{3}$ for protons in Au+Au collisions at 1.23A GeV.
Supported by BMBF (05P15RFFCA), GSI, HGS-HIRe and H-QM.
Author
Behruz Kardan
(IKF, Goethe-Universität Frankfurt)
