David Silvermyr
Senior lecturer
Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions
Author
Summary, in English
The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dNγdir/dη is a smooth function of dNch/dη and can be well described as proportional to (dNch/dη)α with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high pT (>5 GeV/c), but when results from different collision energies are compared, an additional sNN-dependent multiplicative factor is needed to describe the integrated-direct-photon yield. © 2019 authors. Published by the American Physical Society.
Department/s
- eSSENCE: The e-Science Collaboration
- Particle and nuclear physics
Publishing year
2019-07-10
Language
English
Publication/Series
Physical Review Letters
Volume
123
Issue
2
Links
Document type
Journal article
Publisher
American Physical Society
Topic
- Subatomic Physics
Keywords
- Heavy ions
- Photons
- Au+Au collisions
- Collision energies
- Collision systems
- Large Hadron Collider
- Multiplicative factors
- Relativistic Heavy Ion Collider
- Scaling behavior
- Ultrarelativistic heavy ion collision
- Colliding beam accelerators
Status
Published
ISBN/ISSN/Other
- ISSN: 1079-7114