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Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions. | LitMetric
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Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions.

A Adare S Afanasiev C Aidala N N Ajitanand Y Akiba R Akimoto H Al-Bataineh J Alexander M Alfred A Al-Jamel H Al-Ta'ani A Angerami K Aoki N Apadula L Aphecetche Y Aramaki R Armendariz S H Aronson J Asai H Asano

Phys Rev Lett

University of California-Riverside, Riverside, California 92521, USA.

Published: July 2019

AI Article Synopsis

Article Abstract

The PHENIX collaboration presents first measurements of low-momentum (0.41  GeV/c) direct-photon yield dN_{γ}^{dir}/dη is a smooth function of dN_{ch}/dη and can be well described as proportional to (dN_{ch}/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 p_{T} (>5  GeV/c), but when results from different collision energies are compared, an additional sqrt[s_{NN}]-dependent multiplicative factor is needed to describe the integrated-direct-photon yield.

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http://dx.doi.org/10.1103/PhysRevLett.123.022301DOI Listing

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