Document Type
Article
Publication Date
7-10-2019
DOI
10.1103/PhysRevLett.123.022301
Abstract
The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dNdirγ/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.
Recommended Citation
Daugherity, Mike; Isenhower, Donald; and Towell, Rusty, "Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions" (2019). Engineering and Physics. 17.
https://digitalcommons.acu.edu/engineer_physics/17
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This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.