Geometrical scaling of prompt photons in heavy ion collisions
Abstract
We discuss geometrical scaling (GS) for the prompt (direct) photons produced in heavy ion collisions. To this end we first introduce the concept of GS and illustrate its emergence on the example of charged particles. Next, we analyse direct photon data from RHIC and from the LHC. We show that thedata supportthehypothesisofGSin termsof participant number relatedto different centrality classes. We also study GS at different energies, however a more detailed study will be possible only when data for at least three different energies from one experiment will be available and also when we use the data obtained from the collisions of large systems (Cu+Cu, Au+Au, Pb+Pb) and small systems (p+p,d+Au,p+Au).
- Publication:
-
European Physical Journal Web of Conferences
- Pub Date:
- September 2019
- DOI:
- 10.1051/epjconf/201920602002
- arXiv:
- arXiv:1812.04524
- Bibcode:
- 2019EPJWC.20602002P
- Keywords:
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- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 10 page, 7 figures, talk at the ISMD 2018 in Singapore