PHENIX measurements of low momentum direct photon radiation

  • Khachatryan, Vladimir
  • Adare, A.
  • Afanasiev, S.
  • Aidala, C.
  • Ajitanand, N. N.
  • ... Hong, B.
  • 외 712명
Citations

WEB OF SCIENCE

8

초록

The versatility of RHIC allowed the PHENIX collaboration to measure low momentum direct photons from small systems, such as p+p, p+A, d+Au at root s(NN) = 200 GeV as well as from large A+A systems, such as Au+Au and Cu+Cu at 200 GeV and Au+Au at 62.4 GeV and 39 GeV. In these measurements PHENIX has discovered a large excess over the scaled p+p yield of direct photons in A+A collisions, and a non-zero excess over the scaled p+p yield in central p+A collisions. Another PHENIX discovery is that at low-p(T) the integrated yield of direct photons, dN(gamma)/dy, from large systems follows a universal scaling as a function of the charged-particle multiplicity, (dN(ch)/d eta)(alpha), with alpha = 1.25. The observed scaling properties of direct photons from these systems show that the photon production yield increases faster than the charged-particle multiplicity.

키워드

Heavy ion collisionssmall/large collision systemsdirect photonscharged-hadron multiplicitiesCOLLISIONS
제목
PHENIX measurements of low momentum direct photon radiation
저자
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DOI
10.1016/j.nuclphysa.2018.09.069
발행일
2019-02
유형
Article; Proceedings Paper
저널명
Nuclear Physics A
982
페이지
763 ~ 766