CPOD2017: Critical Point and Onset of Deconfinement

Low Momentum Direct Photons in Au+Au collisions at 39 GeV and 62.4 GeV measured by the PHENIX Experiment at RHIC

7 Aug 2017, 17:00

30m

Lecture Hall 2 (Charles B. Wang Cente)

Parallel Session Parallel Session Parallel 3

Speaker

Vladimir Khachatryan (Stony Brook)

Description

Direct photons, which are produced during all stages of a heavy-ion collision, directly probe  the conditions of their production environment. The large yield and large anisotropy of low  momentum direct photons observed in 200 GeV Au+Au collisions poses a significant  challenge to theoretical models. Measurements at a lower collision energy may provide  new insight on the origin of the low momentum direct photons. PHENIX has already measured  the direct photons at 200 GeV via their external conversion on detector material to di-electron  pairs. The advantage of this method is a very good purity in photon identification. This method  is also used in our current analysis of the direct photons at two lower energies. We present the results of the measurements of the low momentum direct photons at 39 GeV and 62.4 GeV.

Presentation materials

Slides

direct_photons_CPOD17_vkhachatryan.pdf