Inclusive π0, η, and direct photon production at high transverse momentum in p+p and d+Au collisions at √sNN=200 GeV
Name
Abelev-2010-Inclusive pi(0), eta.pdf
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1.37 MB
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Checksum (MD5)
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Jones, Christopher LaDon
Kocoloski, Adam Philip
Leight, William Axel
Sakuma, Tai
Seele, Joseph Patrick
Surrow, Bernd
Date Issued
June 2010
Journal
Physical Review C
Publisher
American Physical Society
Citation
Abelev, B. et al. “Inclusive π^{0}, η, and direct photon production at high transverse momentum in p+p and d+Au collisions at sqrt[s_{NN}]=200 GeV.” Physical Review C 81.6 (2010): n. pag. © 2010 The American Physical Society
Version
Final published version
Abstract
We report a measurement of high-p[subscript T] inclusive π [pi][superscript 0], η[eta], and direct photon production in p+p and d+Au collisions at √s[subscript NN]=200 GeV at midrapidity (0<η[eta]<1). Photons from the decay π[pi][superscript 0]→γγ were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The η[eta]→γγ decay was also observed and constituted the first η[eta] measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the π[pi] [superscript 0], η[eta], and ω[omega](782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.
MIT Department
Bates Linear Accelerator Center
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.81.064904
