Low-momentum direct photon measurement in Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV - INSPIRE

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Low-momentum direct photon measurement in Cu $+$ Cu collisions at $\sqrt{s_{_{NN}}}=200$ GeV

PHENIX

Collaboration

•

A. Adare
(
- Colorado U.
)

May 10, 2018

11 pages

Published in:

Phys.Rev.C 98 (2018) 5, 054902

Published: Nov 16, 2018

e-Print:

1805.04066 [hep-ex]

DOI:

10.1103/PhysRevC.98.054902

Experiments:

BNL-RHIC-PHENIX

View in:

reference search33 citations

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Abstract: (APS)

We measured direct photons for pT<5GeV/c in minimum bias and 0%–40% most-central events at midrapidity for Cu+Cu collisions at sNN=200GeV. 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 pT<4GeV/c in Cu+Cu data. The pT 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 dNch/dη observed in Au+Au at the same collision energy.

Note:

450 authors from 72 institutions, 12 pages, 8 figures, 2 tables. Submitted to Physical Review C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Relativistic Nuclear Collisions
photon: direct production
photon: virtual
rapidity: density
mass spectrum
experimental equipment
experimental methods
experimental results

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