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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 Galatyuk^1,2, 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 √s_NN = 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.