Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Heavy-Ion Collisions and QCD Phases XII

HK 56.6: Talk

Friday, April 3, 2020, 12:30–12:45, J-HS F

Feasibility study for the measurement of direct photon elliptic flow in central Pb-Pb collisions at √s_NN = 17.3 GeV with WA98 — •Tim Rogoschinski¹, Henner Büsching¹, and Klaus Reygers² — ¹Institut für Kernphysik, Goethe-Universität Frankfurt — ²Physikalisches Institut, University of Heidelberg

The collaborations ALICE at LHC and PHENIX at RHIC have reported on the invariant yield and elliptic flow v₂ of direct photons in heavy-ion collisions. The PHENIX collaboration discovered a large excess of direct photons compared to the reference in p+p collisions as well as a large v₂ of direct photons. The magnitude of direct photon v₂ measured with ALICE is similar to the v₂ observed by PHENIX. For theoretical models the simultaneous description of the large yield and the large v₂ remains a challenge and is commonly referred to as the direct photon puzzle. A joint measurement of the direct photon yield and v₂ at SPS energy could provide additional input for theoretical models. The WA98 collaboration at SPS earlier has reported on the direct photon invariant yield [1]. In this talk, a reanalysis of the WA98 dataset from 1996 with a focus on the v₂ of direct photons produced in central Pb-Pb collisions at √s_NN = 17.3 GeV utilizing the Plastic-Ball and the LEDA detector will be presented.

Supported by BMBF and the Helmholtz Association.

[1] Phys.Rev.Lett. 85 (2000) 3595-3599