Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Heavy-Ion Collisions and QCD Phases XII

HK 56.6: Vortrag

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

Feasibility study for the measurement of direct photon elliptic flow in central Pb-Pb collisions at sNN = 17.3 GeV with WA98 — •Tim Rogoschinski1, Henner Büsching1, and Klaus Reygers21Institut 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 √sNN = 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

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