Inclusive 0 , , and direct photon production at high transverse momentum in p + p and d + Au collisions at sNN = 200
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چکیده
Citation Abelev, B. et al. " Inclusive ^{0}, , 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. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Inclusive π 0 , η, and direct photon production at high transverse momentum in p + p and d + Au collisions at We report a measurement of high-p T inclusive π 0 , η, and direct photon production in p + p and d + Au collisions at √ s NN = 200 GeV at midrapidity (0 < η < 1). Photons from the decay π 0 → γ γ were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The η → γ γ decay was also observed and constituted the first η measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the π 0 , η, and ω(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.
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