Thermal Photon Radiation in High Multiplicity p+Pb Collisions at the Large Hadron Collider.


Journal Article

The collective behavior of hadronic particles has been observed in high multiplicity proton-lead collisions at the Large Hadron Collider, as well as in deuteron-gold collisions at the Relativistic Heavy-Ion Collider. In this work we present the first calculation, in the hydrodynamic framework, of thermal photon radiation from such small collision systems. Owing to their compact size, these systems can reach temperatures comparable to those in central nucleus-nucleus collisions. The thermal photons can thus shine over the prompt background, and increase the low p_{T} direct photon spectrum by a factor of 2-3 in 0%-1% p+Pb collisions at 5.02 TeV. This thermal photon enhancement can therefore serve as a signature of the existence of a hot quark-gluon plasma during the evolution of these small collision systems, as well as validate hydrodynamic behavior in small systems.

Full Text

Duke Authors

Cited Authors

  • Shen, C; Paquet, J-F; Denicol, GS; Jeon, S; Gale, C

Published Date

  • February 18, 2016

Published In

Volume / Issue

  • 116 / 7

Start / End Page

  • 072301 -

PubMed ID

  • 26943529

Pubmed Central ID

  • 26943529

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.116.072301


  • eng