/ nucl-ex arXiv:1405.3940


Centrality dependence of low-momentum direct-photon production in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV


Adare, A. (Colorado U.) ; Afanasiev, S. (Dubna, JINR) ; Aidala, C. (Michigan U.) ; Ajitanand, N.N. (SUNY, Stony Brook) ; Akiba, Y. (Brookhaven) ; Akimoto, R. (Tokyo U.) ; Al-Bataineh, H. (New Mexico State U.) ; Al-Ta'ani, H. (New Mexico State U.) ; Alexander, J. (SUNY, Stony Brook) ; Angerami, A. (Nevis Labs, Columbia U.) ; Aoki, K. (Nishina Ctr., RIKEN) ; Apadula, N. (SUNY, Stony Brook) ; Aramaki, Y. (Nishina Ctr., RIKEN) ; Asano, H. (Nishina Ctr., RIKEN) ; Aschenauer, E.C. (Brookhaven) ; Atomssa, E.T. (SUNY, Stony Brook) ; Averbeck, R. (SUNY, Stony Brook) ; Awes, T.C. (Oak Ridge) ; Azmoun, B. (Brookhaven) ; Babintsev, V. (Serpukhov, IHEP) ; Bai, M. (Brookhaven) ; Baksay, G. (Florida Inst. Tech.) ; Baksay, L. (Florida Inst. Tech.) ; Bannier, B. (SUNY, Stony Brook) ; Barish, K.N. (UC, Riverside) ; Bassalleck, B. (New Mexico U.) ; Basye, A.T. (Abilene Christian U.) ; Bathe, S. (Brookhaven) ; Baublis, V. (St. Petersburg, INP) ; Baumann, C. (Munster U.) ; Baumgart, S. (Nishina Ctr., RIKEN) ; Bazilevsky, A. (Brookhaven) ; Belikov, S. (Brookhaven) ; Belmont, R. (Vanderbilt U.) ; Bennett, R. (SUNY, Stony Brook) ; Berdnikov, A. (St. Petersburg Polytechnic Inst.) ; Berdnikov, Y. (St. Petersburg Polytechnic Inst.) ; Bickley, A.A. (Colorado U.) ; Bing, X. (Ohio U.) ; Blau, D.S. (Kurchatov Inst., Moscow) ; Bok, J.S. (Yonsei U.) ; Boyle, K. (SUNY, Stony Brook) ; Brooks, M.L. (Los Alamos) ; Buesching, H. (Brookhaven) ; Bumazhnov, V. (Serpukhov, IHEP) ; Bunce, G. (Brookhaven) ; Butsyk, S. (New Mexico U.) ; Camacho, C.M. (Los Alamos) ; Campbell, S. (SUNY, Stony Brook) ; Castera, P. (SUNY, Stony Brook) ; Chen, C.H. (SUNY, Stony Brook) ; Chi, C.Y. (Nevis Labs, Columbia U.) ; Chiu, M. (Brookhaven) ; Choi, I.J. (Yonsei U.) ; Choi, J.B. (Chonbuk Natl. U.) ; Choi, S. (Seoul Natl. U.) ; Choudhury, R.K. (Bhabha Atomic Res. Ctr.) ; Christiansen, P. (Lund U.) ; Chujo, T. (Tsukuba U.) ; Chung, P. (SUNY, Stony Brook) ; Chvala, O. (UC, Riverside) ; Cianciolo, V. (Oak Ridge) ; Citron, Z. (SUNY, Stony Brook) ; Cole, B.A. (Nevis Labs, Columbia U.) ; Connors, M. (SUNY, Stony Brook) ; Constantin, P. (Los Alamos) ; Csanad, M. (Eotvos U.) ; Csorgo, T. (Budapest, RMKI) ; Dahms, T. (SUNY, Stony Brook) ; Dairaku, S. (Nishina Ctr., RIKEN) ; Danchev, I. (Vanderbilt U.) ; Das, K. (Florida State U.) ; Datta, A. (Massachusetts U., Amherst) ; Daugherity, M.S. (Abilene Christian U.) ; David, G. (Brookhaven) ; Denisov, A. (Serpukhov, IHEP) ; Deshpande, A. (SUNY, Stony Brook) ; Desmond, E.J. (Brookhaven) ; Dharmawardane, K.V. (New Mexico State U.) ; Dietzsch, O. (Sao Paulo U.) ; Ding, L. (Iowa State U.) ; Dion, A. (SUNY, Stony Brook) ; Donadelli, M. (Sao Paulo U.) ; Drapier, O. (Ecole Polytechnique) ; Drees, A. (SUNY, Stony Brook) ; Drees, K.A. (Brookhaven) ; Durham, J.M. (SUNY, Stony Brook) ; Durum, A. (Serpukhov, IHEP) ; Dutta, D. (Bhabha Atomic Res. Ctr.) ; D'Orazio, L. (Maryland U.) ; Edwards, S. (Florida State U.) ; Efremenko, Y.V. (Oak Ridge) ; Ellinghaus, F. (Colorado U.) ; Engelmore, T. (Nevis Labs, Columbia U.) ; Enokizono, A. (Oak Ridge) ; En'yo, H. (Brookhaven) ; Esumi, S. (Tsukuba U.) ; Eyser, K.O. (UC, Riverside) ; Fadem, B. (Muhlenberg Coll.) ; Fields, D.E. (New Mexico U.) ; Finger, M. (Charles U.) ; M. Finger, Jr. (Charles U.) ; Fleuret, F. (Ecole Polytechnique) ; Fokin, S.L. (Kurchatov Inst., Moscow) ; Fraenkel, Z. (Weizmann Inst.) ; Frantz, J.E. (SUNY, Stony Brook) ; Franz, A. (Brookhaven) ; Frawley, A.D. (Florida State U.) ; Fujiwara, K. (Nishina Ctr., RIKEN) ; Fukao, Y. (Nishina Ctr., RIKEN) ; Fusayasu, T. (Nagasaki Inst. Appl. Sci.) ; Gainey, K. (Abilene Christian U.) ; Gal, C. (SUNY, Stony Brook) ; Garishvili, A. (Tennessee U.) ; Garishvili, I. (Tennessee U.) ; Glenn, A. (LLNL, Livermore) ; Gong, H. (SUNY, Stony Brook) ; Gong, X. (SUNY, Stony Brook) ; Gonin, M. (Ecole Polytechnique) ; Goto, Y. (Brookhaven) ; Granier de Cassagnac, R. (Ecole Polytechnique) ; Grau, N. (Nevis Labs, Columbia U.) ; Greene, S.V. (Vanderbilt U.) ; Grosse Perdekamp, M. (Brookhaven) ; Gunji, T. (Tokyo U.) ; Guo, L. (Los Alamos) ; Gustafsson, H.A. (Lund U.) ; Hachiya, T. (Nishina Ctr., RIKEN) ; Haggerty, J.S. (Brookhaven) ; Hahn, K.I. (Ewha Women's U., Seoul) ; Hamagaki, H. (Tokyo U.) ; Hamblen, J. (Tennessee U.) ; Han, R. (Peking U.) ; Hanks, J. (Nevis Labs, Columbia U.) ; Hartouni, E.P. (LLNL, Livermore) ; Hashimoto, K. (Rikkyo U.) ; Haslum, E. (Lund U.) ; Hayano, R. (Tokyo U.) ; He, X. (Georgia State U.) ; Heffner, M. (LLNL, Livermore) ; Hemmick, T.K. (SUNY, Stony Brook) ; Hester, T. (UC, Riverside) ; Hill, J.C. (Iowa State U.) ; Hohlmann, M. (Florida Inst. Tech.) ; Hollis, R.S. (UC, Riverside) ; Holzmann, W. (Nevis Labs, Columbia U.) ; Homma, K. (Hiroshima U.) ; Hong, B. (Korea U.) ; Horaguchi, T. (Tsukuba U.) ; Hori, Y. (Tokyo U.) ; Hornback, D. (Tennessee U.) ; Huang, S. (Vanderbilt U.) ; Ichihara, T. (Brookhaven) ; Ichimiya, R. (Nishina Ctr., RIKEN) ; Ide, J. (Muhlenberg Coll.) ; Iinuma, H. (KEK, Tsukuba) ; Ikeda, Y. (Tsukuba U.) ; Imai, K. (Nishina Ctr., RIKEN) ; Imrek, J. (Debrecen U.) ; Inaba, M. (Tsukuba U.) ; Iordanova, A. (UC, Riverside) ; Isenhower, D. (Abilene Christian U.) ; Ishihara, M. (Nishina Ctr., RIKEN) ; Isobe, T. (Nishina Ctr., RIKEN) ; Issah, M. (Vanderbilt U.) ; Isupov, A. (Dubna, JINR) ; Ivanischev, D. (St. Petersburg, INP) ; Ivanishchev, D. (St. Petersburg, INP) ; Jacak, B.V. (SUNY, Stony Brook) ; Javani, M. (Georgia State U.) ; Jia, J. (SUNY, Stony Brook) ; Jiang, X. (Los Alamos) ; Jin, J. (Nevis Labs, Columbia U.) ; Johnson, B.M. (Brookhaven) ; Joo, K.S. (Myong Ji U.) ; Jouan, D. (Orsay) ; Jumper, D.S. (Illinois U., Urbana) ; Kajihara, F. (Tokyo U.) ; Kametani, S. (Nishina Ctr., RIKEN) ; Kamihara, N. (Brookhaven) ; Kamin, J. (SUNY, Stony Brook) ; Kaneti, S. (SUNY, Stony Brook) ; Kang, B.H. (Hanyang U.) ; Kang, J.H. (Yonsei U.) ; Kang, J.S. (Hanyang U.) ; Kapustinsky, J. (Los Alamos) ; Karatsu, K. (Nishina Ctr., RIKEN) ; Kasai, M. (Rikkyo U.) ; Kawall, D. (Brookhaven) ; Kawashima, M. (Rikkyo U.) ; Kazantsev, A.V. (Kurchatov Inst., Moscow) ; Kempel, T. (Iowa State U.) ; Khanzadeev, A. (St. Petersburg, INP) ; Kijima, K.M. (Hiroshima U.) ; Kim, B.I. (Korea U.) ; Kim, C. (Korea U.) ; Kim, D.H. (Myong Ji U.) ; Kim, D.J. (Helsinki Inst. of Phys.) ; Kim, E. (Seoul Natl. U.) ; Kim, E.J. (Chonbuk Natl. U.) ; Kim, H.J. (Yonsei U.) ; Kim, K.B. (Chonbuk Natl. U.) ; Kim, S.H. (Yonsei U.) ; Kim, Y.J. (Illinois U., Urbana) ; Kim, Y.K. (Hanyang U.) ; Kinney, E. (Colorado U.) ; Kiriluk, K. (Colorado U.) ; Kiss, A. (Eotvos U.) ; Kistenev, E. (Brookhaven) ; Klatsky, J. (Florida State U.) ; Kleinjan, D. (UC, Riverside) ; Kline, P. (SUNY, Stony Brook) ; Kochenda, L. (St. Petersburg, INP) ; Komatsu, Y. (Tokyo U.) ; Komkov, B. (St. Petersburg, INP) ; Konno, M. (Tsukuba U.) ; Koster, J. (Illinois U., Urbana) ; Kotchetkov, D. (Ohio U.) ; Kotov, D. (St. Petersburg Polytechnic Inst.) ; Kozlov, A. (Weizmann Inst.) ; Kral, A. (Prague, Tech. U.) ; Kravitz, A. (Nevis Labs, Columbia U.) ; Krizek, F. (Helsinki Inst. of Phys.) ; Kunde, G.J. (Los Alamos) ; Kurita, K. (Rikkyo U.) ; Kurosawa, M. (Nishina Ctr., RIKEN) ; Kwon, Y. (Yonsei U.) ; Kyle, G.S. (New Mexico State U.) ; Lacey, R. (SUNY, Stony Brook) ; Lai, Y.S. (Nevis Labs, Columbia U.) ; Lajoie, J.G. (Iowa State U.) ; Lebedev, A. (Iowa State U.) ; Lee, B. (Hanyang U.) ; Lee, D.M. (Los Alamos) ; Lee, J. (Ewha Women's U., Seoul) ; Lee, K. (Seoul Natl. U.) ; Lee, K.B. (Korea U.) ; Lee, K.S. (Korea U.) ; Lee, S.H. (SUNY, Stony Brook) ; Lee, S.R. (Chonbuk Natl. U.) ; Leitch, M.J. (Los Alamos) ; Leite, M.A.L. (Sao Paulo U.) ; Leitgab, M. (Illinois U., Urbana) ; Leitner, E. (Vanderbilt U.) ; Lenzi, B. (Sao Paulo U.) ; Lewis, B. (SUNY, Stony Brook) ; Li, X. (Beijing, Inst. Atomic Energy) ; Liebing, P. (Brookhaven) ; Lim, S.H. (Yonsei U.) ; Linden Levy, L.A. (Colorado U.) ; Liska, T. (Prague, Tech. U.) ; Litvinenko, A. (Dubna, JINR) ; Liu, H. (New Mexico State U.) ; Liu, M.X. (Los Alamos) ; Love, B. (Vanderbilt U.) ; Luechtenborg, R. (Munster U.) ; Lynch, D. (Brookhaven) ; Maguire, C.F. (Vanderbilt U.) ; Makdisi, Y.I. (Brookhaven) ; Makek, M. (Zagreb U., Phys. Dept.) ; Malakhov, A. (Dubna, JINR) ; Malik, M.D. (New Mexico U.) ; Manion, A. (SUNY, Stony Brook) ; Manko, V.I. (Kurchatov Inst., Moscow) ; Mannel, E. (Nevis Labs, Columbia U.) ; Mao, Y. (Nishina Ctr., RIKEN) ; Masui, H. (Tsukuba U.) ; Masumoto, S. (Tokyo U.) ; Matathias, F. (Nevis Labs, Columbia U.) ; McCumber, M. (SUNY, Stony Brook) ; McGaughey, P.L. (Los Alamos) ; McGlinchey, D. (Florida State U.) ; McKinney, C. (Illinois U., Urbana) ; Means, N. (SUNY, Stony Brook) ; Mendoza, M. (UC, Riverside) ; Meredith, B. (Illinois U., Urbana) ; Miake, Y. (Tsukuba U.) ; Mibe, T. (KEK, Tsukuba) ; Mignerey, A.C. (Maryland U.) ; Mikes, P. (Prague, Inst. Phys.) ; Miki, K. (Tsukuba U.) ; Milov, A. (Weizmann Inst.) ; Mishra, D.K. (Bhabha Atomic Res. Ctr.) ; Mishra, M. (Banaras Hindu U.) ; Mitchell, J.T. (Brookhaven) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Miyasaka, S. (Tokyo Inst. Tech.) ; Mohanty, A.K. (Bhabha Atomic Res. Ctr.) ; Moon, H.J. (Myong Ji U.) ; Morino, Y. (Tokyo U.) ; Morreale, A. (UC, Riverside) ; Morrison, D.P. (Brookhaven) ; Motschwiller, S. (Muhlenberg Coll.) ; Moukhanova, T.V. (Kurchatov Inst., Moscow) ; Murakami, T. (Nishina Ctr., RIKEN) ; Murata, J. (Rikkyo U.) ; Nagae, T. (Kyoto U.) ; Nagamiya, S. (Nishina Ctr., RIKEN) ; Nagle, J.L. (Colorado U.) ; Naglis, M. (Weizmann Inst.) ; Nagy, M.I. (Budapest, RMKI) ; Nakagawa, I. (Brookhaven) ; Nakamiya, Y. (Hiroshima U.) ; Nakamura, K.R. (Nishina Ctr., RIKEN) ; Nakamura, T. (Nishina Ctr., RIKEN) ; Nakano, K. (Tokyo Inst. Tech.) ; Nattrass, C. (Tennessee U.) ; Nederlof, A. (Muhlenberg Coll.) ; Newby, J. (LLNL, Livermore) ; Nguyen, M. (SUNY, Stony Brook) ; Nihashi, M. (Nishina Ctr., RIKEN) ; Nouicer, R. (Brookhaven) ; Novitzky, N. (Helsinki Inst. of Phys.) ; Nyanin, A.S. (Kurchatov Inst., Moscow) ; O'Brien, E. (Brookhaven) ; Oda, S.X. (Tokyo U.) ; Ogilvie, C.A. (Iowa State U.) ; Oka, M. (Tsukuba U.) ; Okada, K. (Brookhaven) ; Onuki, Y. (Nishina Ctr., RIKEN) ; Oskarsson, A. (Lund U.) ; Ouchida, M. (Nishina Ctr., RIKEN) ; Ozawa, K. (Tokyo U.) ; Pak, R. (Brookhaven) ; Pantuev, V. (SUNY, Stony Brook) ; Papavassiliou, V. (New Mexico State U.) ; Park, B.H. (Hanyang U.) ; Park, I.H. (Ewha Women's U., Seoul) ; Park, J. (Seoul Natl. U.) ; Park, S.K. (Korea U.) ; Park, W.J. (Korea U.) ; Pate, S.F. (New Mexico State U.) ; Patel, L. (Georgia State U.) ; Pei, H. (Iowa State U.) ; Peng, J.C. (Illinois U., Urbana) ; Pereira, H. (DAPNIA, Saclay) ; Peresedov, V. (Dubna, JINR) ; Peressounko, D.Yu. (Kurchatov Inst., Moscow) ; Petti, R. (SUNY, Stony Brook) ; Pinkenburg, C. (Brookhaven) ; Pisani, R.P. (Brookhaven) ; Proissl, M. (SUNY, Stony Brook) ; Purschke, M.L. (Brookhaven) ; Purwar, A.K. (Los Alamos) ; Qu, H. (Georgia State U.) ; Rak, J. (Helsinki Inst. of Phys.) ; Rakotozafindrabe, A. (Ecole Polytechnique) ; Ravinovich, I. (Weizmann Inst.) ; Read, K.F. (Tennessee U.) ; Reygers, K. (Munster U.) ; Reynolds, D. (SUNY, Stony Brook) ; Riabov, V. (St. Petersburg, INP) ; Riabov, Y. (St. Petersburg Polytechnic Inst.) ; Richardson, E. (Maryland U.) ; Riveli, N. (Ohio U.) ; Roach, D. (Vanderbilt U.) ; Roche, G. (Clermont-Ferrand U.) ; Rolnick, S.D. (UC, Riverside) ; Rosati, M. (Iowa State U.) ; Rosen, C.A. (Colorado U.) ; Rosendahl, S.S.E. (Lund U.) ; Rosnet, P. (Clermont-Ferrand U.) ; Rukoyatkin, P. (Dubna, JINR) ; Ruzicka, P. (Prague, Inst. Phys.) ; Sahlmueller, B. (SUNY, Stony Brook) ; Saito, N. (KEK, Tsukuba) ; Sakaguchi, T. (Brookhaven) ; Sakashita, K. (Tokyo Inst. Tech.) ; Samsonov, V. (St. Petersburg, INP) ; Sano, M. (Tsukuba U.) ; Sano, S. (Waseda U.) ; Sarsour, M. (Georgia State U.) ; Sato, T. (Tsukuba U.) ; Sawada, S. (KEK, Tsukuba) ; Sedgwick, K. (UC, Riverside) ; Seele, J. (Colorado U.) ; Seidl, R. (Brookhaven) ; Semenov, A.Yu. (Iowa State U.) ; Sen, A. (Georgia State U.) ; Seto, R. (UC, Riverside) ; Sharma, D. (Weizmann Inst.) ; Shein, I. (Serpukhov, IHEP) ; Shibata, T.A. (Tokyo Inst. Tech.) ; Shigaki, K. (Hiroshima U.) ; Shimomura, M. (Tsukuba U.) ; Shoji, K. (Nishina Ctr., RIKEN) ; Shukla, P. (Bhabha Atomic Res. Ctr.) ; Sickles, A. (Brookhaven) ; Silva, C.L. (Sao Paulo U.) ; Silvermyr, D. (Oak Ridge) ; Silvestre, C. (DAPNIA, Saclay) ; Sim, K.S. (Korea U.) ; Singh, B.K. (Banaras Hindu U.) ; Singh, C.P. (Banaras Hindu U.) ; Singh, V. (Banaras Hindu U.) ; Slunecka, M. (Charles U.) ; Soltz, R.A. (LLNL, Livermore) ; Sondheim, W.E. (Los Alamos) ; Sorensen, S.P. (Tennessee U.) ; Soumya, M. (SUNY, Stony Brook) ; Sourikova, I.V. (Brookhaven) ; Sparks, N.A. (Abilene Christian U.) ; Stankus, P.W. (Oak Ridge) ; Stenlund, E. (Lund U.) ; Stepanov, M. (Massachusetts U., Amherst) ; Ster, A. (Budapest, RMKI) ; Stoll, S.P. (Brookhaven) ; Sugitate, T. (Hiroshima U.) ; Sukhanov, A. (Brookhaven) ; Sun, J. (SUNY, Stony Brook) ; Sziklai, J. (Budapest, RMKI) ; Takagui, E.M. (Sao Paulo U.) ; Takahara, A. (Tokyo U.) ; Taketani, A. (Brookhaven) ; Tanabe, R. (Tsukuba U.) ; Tanaka, Y. (Nagasaki Inst. Appl. Sci.) ; Taneja, S. (SUNY, Stony Brook) ; Tanida, K. (Seoul Natl. U.) ; Tannenbaum, M.J. (Brookhaven) ; Tarafdar, S. (Banaras Hindu U.) ; Taranenko, A. (SUNY, Stony Brook) ; Tarjan, P. (Debrecen U.) ; Tennant, E. (New Mexico State U.) ; Themann, H. (SUNY, Stony Brook) ; Thomas, T.L. (New Mexico U.) ; Todoroki, T. (Tsukuba U.) ; Togawa, M. (Nishina Ctr., RIKEN) ; Toia, A. (SUNY, Stony Brook) ; Tomasek, L. (Prague, Inst. Phys.) ; Tomasek, M. (Prague, Inst. Phys.) ; Torii, H. (Hiroshima U.) ; Towell, R.S. (Abilene Christian U.) ; Tserruya, I. (Weizmann Inst.) ; Tsuchimoto, Y. (Hiroshima U.) ; Tsuji, T. (Tokyo U.) ; Vale, C. (Iowa State U.) ; Valle, H. (Vanderbilt U.) ; van Hecke, H.W. (Los Alamos) ; Vargyas, M. (Eotvos U.) ; Vazquez-Zambrano, E. (Nevis Labs, Columbia U.) ; Veicht, A. (Illinois U., Urbana) ; Velkovska, J. (Vanderbilt U.) ; Vertesi, R. (Budapest, RMKI) ; Vinogradov, A.A. (Kurchatov Inst., Moscow) ; Virius, M. (Prague, Tech. U.) ; Vossen, A. (Illinois U., Urbana) ; Vrba, V. (Prague, Inst. Phys.) ; Vznuzdaev, E. (St. Petersburg, INP) ; Wang, X.R. (New Mexico State U.) ; Watanabe, D. (Hiroshima U.) ; Watanabe, K. (Tsukuba U.) ; Watanabe, Y. (Brookhaven) ; Watanabe, Y.S. (Tokyo U.) ; Wei, F. (Iowa State U.) ; Wei, R. (SUNY, Stony Brook) ; Wessels, J. (Munster U.) ; Whitaker, S. (Iowa State U.) ; White, S.N. (Brookhaven) ; Winter, D. (Nevis Labs, Columbia U.) ; Wolin, S. (Illinois U., Urbana) ; Wood, J.P. (Abilene Christian U.) ; Woody, C.L. (Brookhaven) ; Wright, R.M. (Abilene Christian U.) ; Wysocki, M. (Colorado U.) ; Xie, W. (Brookhaven) ; Yamaguchi, Y.L. (Nishina Ctr., RIKEN) ; Yamaura, K. (Hiroshima U.) ; Yang, R. (Illinois U., Urbana) ; Yanovich, A. (Serpukhov, IHEP) ; Ying, J. (Georgia State U.) ; Yokkaichi, S. (Brookhaven) ; You, Z. (Peking U.) ; Young, G.R. (Oak Ridge) ; Younus, I. (New Mexico U.) ; Yushmanov, I.E. (Kurchatov Inst., Moscow) ; Zajc, W.A. (Nevis Labs, Columbia U.) ; Zelenski, A. (Brookhaven) ; Zhang, C. (Oak Ridge) ; Zhou, S. (Beijing, Inst. Atomic Energy) ; Zolin, L. (Dubna, JINR)

Pages: authors,

Abstract: The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV down to $p_T=0.4$ GeV/$c$. Photons are detected via photon conversions to $e^+e^-$ pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low $p_T$. We find an excess of direct photons above the $N_{\rm coll}$-scaled yield measured in $p$$+$$p$ collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240 MeV/$c$ in the $p_T$ range from 0.6--2.0 GeV/$c$. While the shape of the $p_T$ distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with $N_{\rm part}^\alpha$, where $\alpha=1.48{\pm}0.08({\rm stat}){\pm}0.04({\rm syst})$.

Web-Page: http://inspirehep.net/record/1296308/files/1d_mass.png; http://inspirehep.net/record/1296308/files/2d_mass.png; http://inspirehep.net/record/1296308/files/direct_yield.png; http://inspirehep.net/record/1296308/files/direct_yield_mb.png; http://inspirehep.net/record/1296308/files/int_yield_np_1.png; http://inspirehep.net/record/1296308/files/pi0_mass.png; http://inspirehep.net/record/1296308/files/r_g_combined.png; http://inspirehep.net/record/1296308/files/r_g_mb_all.png; http://inspirehep.net/record/1296308/files/thermal_yield_0_6.png; http://inspirehep.net/record/1296308/files/arXiv:1405.3940.pdf


Note: *Brief entry*; *Temporary entry*; 480 authors, pages, 9 figures, 3 tables, 2007 and 2010 data. Submitted to Phys. Rev. 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

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