Midrapidity direct-photon production in $p+p$ collisions at $\sqrt{s}$ = 200 GeV
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- Afanasiev, S.
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- Ajitanand, N.N.
- Akiba, Y.
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- Aphecetche, Laurent
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- Kim, D.J.
- Kim, D.W.
- Kim, E.
- Kim, G.-B.
- Kim, H.J.
- Kistenev, E.
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- Lebedev, A.,
- Leckey, S.
- Lee, D.M.
- Lee, S.,
- Leitch, M.J.
- Li, X.H.
- Lim, H.
- Litvinenko, A.
- Liu, M.X.
- Liu, Yehan
- Maguire, C.F.
- Makdisi, Y.I.
- Malakhov, A.
- Manko, V.I.
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- Martinez Garcia, Gines
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- Sullivan, J.P.
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- Tanaka, K.H.
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- Tanida, K.
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- Velkovsky, M.
- Veszpremi, V.
- Villatte, L.
- Vinogradov, A.A.
- Volkov, M.A.
- Vznuzdaev, E.
- Wang, X.R.
- Watanabe, Y.
- White, S.N.
- Wohn, F.K.
- Woody, C.L.
- Xie, W.
- Yang, Y.
- Yanovich, A.
- Yokkaichi, S.
- Young, G.R.
- Yushmanov, I.E.
- Zajc, W.A.
- Zhang, C.
- Zhou, S.
- Zhou, S.J.
- Zolin, L.
DOIAbstract
330 authors, 7 pages text, RevTeX, 2 figures, 2 tables, - EIA measurement of direct photons in $p+p$ collisions at $\sqrt{s}$=200 GeV is presented. A photon excess above background from $\pi^0\rightarrow\gamma+\gamma$, $\eta\rightarrow\gamma+\gamma$, and other decays is observed in the transverse momentum range $5.5 < p_T < 7 GeV/c$. The result is compared to a next-to-leading-order perturbative QCD calculation. Within errors, good agreement is found between the QCD calculation and the measured resul
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