Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Heavy Ion Collisions and QCD Phases IV
HK 23.4: Talk
Tuesday, February 27, 2018, 17:30–17:45, HZO 60
Lambda Polarization in Au+Au collisions at 1.23 AGeV measured with HADES — •Frederic Kornas1, Tetyana Galatyuk1,2, and Ilya Selyuzhenkov2 for the HADES collaboration — 1TU Darmstadt, Darmstadt, Germany — 2GSI, Darmstadt, Germany
Through its self-analyzing nature the Λ hyperon allows to extract the spin orientation by measuring the outgoing proton momentum. A possible spin polarization with respect to the reaction plane could probe a global polarization of the fireball. This would be a hint for vortical effects at the very early stages of the collision.
Measurements of the Λ polarization by the STAR collaboration indicate a strong enhancement towards lower beam energies. In Au+Au collisions at √sNN = 7.7 GeV they estimated the vorticity to be of the order 1021 s−1 which would be by far the most highest vorticity ever observed in the laboratory.
The contribution will report the status of the Λ polarization in Au+Au collisions at 1.23 AGeV measured with HADES.