Low-momentum direct-photon measurement in Cu plus Cu collisions at root S-NN=200 GeV

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http://hdl.handle.net/10138/272986

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PHENIX Collaboration , Adare , A , Kim , D J & Rak , J 2018 , ' Low-momentum direct-photon measurement in Cu plus Cu collisions at root S-NN=200 GeV ' , Physical Review C , vol. 98 , no. 5 , 054902 . https://doi.org/10.1103/PhysRevC.98.054902

Title: Low-momentum direct-photon measurement in Cu plus Cu collisions at root S-NN=200 GeV
Author: PHENIX Collaboration; Adare, A.; Kim, D. J.; Rak, J.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2018-11-15
Language: eng
Number of pages: 11
Belongs to series: Physical Review C
ISSN: 2469-9985
URI: http://hdl.handle.net/10138/272986
Abstract: We measured direct photons for p(T) <5 GeV/c in minimum bias and 0%-40% most-central events at midrapidity for Cu+Cu collisions at root S-NN = 200 GeV. The e(+)e(-) contribution from quasireal direct virtual photons has been determined as an excess over the known hadronic contributions in the e(+)e(-) mass distribution. A clear enhancement of photons over the binary scaled p+p fit is observed for p(T) <4 GeV/c in Cu+Cu data. The p(T) spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the p+p baseline are 285 +/- 53 (stat) +/- 57(syst) MeV/c and 333 +/- 72(stat) +/- 45(syst) MeV/c for minimum bias and 0%-40% most-central events, respectively. The rapidity density, dN / dy, of photons demonstrates the same power law as a function of dN(ch)/d eta observed in Au+Au at the same collision energy.
Subject: STAR-COLLABORATION
114 Physical sciences
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