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Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions.

  • Author(s): Adare, A;
  • Afanasiev, S;
  • Aidala, C;
  • Ajitanand, NN;
  • Akiba, Y;
  • Akimoto, R;
  • Al-Bataineh, H;
  • Alexander, J;
  • Alfred, M;
  • Al-Jamel, A;
  • Al-Ta'ani, H;
  • Angerami, A;
  • Aoki, K;
  • Apadula, N;
  • Aphecetche, L;
  • Aramaki, Y;
  • Armendariz, R;
  • Aronson, SH;
  • Asai, J;
  • Asano, H;
  • Aschenauer, EC;
  • Atomssa, ET;
  • Averbeck, R;
  • Awes, TC;
  • Azmoun, B;
  • Babintsev, V;
  • Bagoly, A;
  • Bai, M;
  • Baksay, G;
  • Baksay, L;
  • Baldisseri, A;
  • Bannier, B;
  • Barish, KN;
  • Barnes, PD;
  • Bassalleck, B;
  • Basye, AT;
  • Bathe, S;
  • Batsouli, S;
  • Baublis, V;
  • Bauer, F;
  • Baumann, C;
  • Baumgart, S;
  • Bazilevsky, A;
  • Belikov, S;
  • Belmont, R;
  • Bennett, R;
  • Berdnikov, A;
  • Berdnikov, Y;
  • Bhom, JH;
  • Bickley, AA;
  • Bjorndal, MT;
  • Blau, DS;
  • Boer, M;
  • Boissevain, JG;
  • Bok, JS;
  • Borel, H;
  • Boyle, K;
  • Brooks, ML;
  • Brown, DS;
  • Bryslawskyj, J;
  • Bucher, D;
  • Buesching, H;
  • Bumazhnov, V;
  • Bunce, G;
  • Burward-Hoy, JM;
  • Butsyk, S;
  • Camacho, CM;
  • Campbell, S;
  • Canoa Roman, V;
  • Caringi, A;
  • Castera, P;
  • Chai, J-S;
  • Chang, BS;
  • Chang, WC;
  • Charvet, J-L;
  • Chen, C-H;
  • Chernichenko, S;
  • Chi, CY;
  • Chiba, J;
  • Chiu, M;
  • Choi, IJ;
  • Choi, JB;
  • Choi, S;
  • Choudhury, RK;
  • Christiansen, P;
  • Chujo, T;
  • Chung, P;
  • Churyn, A;
  • Chvala, O;
  • Cianciolo, V;
  • Citron, Z;
  • Cleven, CR;
  • Cobigo, Y;
  • Cole, BA;
  • Comets, MP;
  • Conesa Del Valle, Z;
  • Connors, M;
  • Constantin, P;
  • Csanád, M;
  • Csörgő, T;
  • Dahms, T;
  • Dairaku, S;
  • Danchev, I;
  • Danley, TW;
  • Das, K;
  • Datta, A;
  • Daugherity, MS;
  • David, G;
  • Dayananda, MK;
  • Deaton, MB;
  • Dehmelt, K;
  • Delagrange, H;
  • Denisov, A;
  • d'Enterria, D;
  • Deshpande, A;
  • Desmond, EJ;
  • Dharmawardane, KV;
  • Dietzsch, O;
  • Ding, L;
  • Dion, A;
  • Do, JH;
  • Donadelli, M;
  • D'Orazio, L;
  • Drachenberg, JL;
  • Drapier, O;
  • Drees, A;
  • Drees, KA;
  • Dubey, AK;
  • Durham, JM;
  • Durum, A;
  • Dutta, D;
  • Dzhordzhadze, V;
  • Edwards, S;
  • Efremenko, YV;
  • Egdemir, J;
  • Ellinghaus, F;
  • Emam, WS;
  • Engelmore, T;
  • Enokizono, A;
  • En'yo, H;
  • Espagnon, B;
  • Esumi, S;
  • Eyser, KO;
  • Fadem, B;
  • Fan, W;
  • Feege, N;
  • Fields, DE;
  • Finger, M;
  • Finger, M;
  • Fleuret, F;
  • Fokin, SL;
  • Forestier, B;
  • Fraenkel, Z;
  • Frantz, JE;
  • Franz, A;
  • Frawley, AD;
  • Fujiwara, K;
  • Fukao, Y;
  • Fung, S-Y;
  • Fusayasu, T;
  • Gadrat, S;
  • Gainey, K;
  • Gal, C;
  • Gallus, P;
  • Garg, P;
  • Garishvili, A;
  • Garishvili, I;
  • Gastineau, F;
  • Ge, H;
  • Germain, M;
  • Glenn, A;
  • Gong, H;
  • Gong, X;
  • Gonin, M;
  • Gosset, J;
  • Goto, Y;
  • Granier de Cassagnac, R;
  • Grau, N;
  • Greene, SV;
  • Grim, G;
  • Grosse Perdekamp, M;
  • Gunji, T;
  • Guo, L;
  • Gustafsson, H-Å;
  • Hachiya, T;
  • Hadj Henni, A;
  • Haegemann, C;
  • Haggerty, JS;
  • Hagiwara, MN;
  • Hahn, KI;
  • Hamagaki, H;
  • Hamblen, J;
  • Han, R;
  • Hanks, J;
  • Harada, H;
  • Hartouni, EP;
  • Haruna, K;
  • Harvey, M;
  • Hasegawa, S;
  • Haseler, TOS;
  • Hashimoto, K;
  • Haslum, E;
  • Hasuko, K;
  • Hayano, R;
  • He, X;
  • Heffner, M;
  • Hemmick, TK;
  • Hester, T;
  • Heuser, JM;
  • Hiejima, H;
  • Hill, JC;
  • Hill, K;
  • Hobbs, R;
  • Hodges, A;
  • Hohlmann, M;
  • Hollis, RS;
  • Holmes, M;
  • Holzmann, W;
  • Homma, K;
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  • Hori, Y;
  • Hornback, D;
  • Hotvedt, N;
  • Huang, J;
  • Huang, S;
  • Hur, MG;
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  • Iinuma, H;
  • Ikeda, Y;
  • Imai, K;
  • Imrek, J;
  • Inaba, M;
  • Inoue, Y;
  • Iordanova, A;
  • Isenhower, D;
  • Isenhower, L;
  • Ishihara, M;
  • Isobe, T;
  • Issah, M;
  • Isupov, A;
  • Ivanishchev, D;
  • Iwanaga, Y;
  • Jacak, BV;
  • Javani, M;
  • Ji, Z;
  • Jia, J;
  • Jiang, X;
  • Jin, J;
  • Jinnouchi, O;
  • Johnson, BM;
  • Jones, T;
  • Joo, KS;
  • Jouan, D;
  • Jumper, DS;
  • Kajihara, F;
  • Kametani, S;
  • Kamihara, N;
  • Kamin, J;
  • Kaneta, M;
  • Kaneti, S;
  • Kang, BH;
  • Kang, JH;
  • Kang, JS;
  • Kanou, H;
  • Kapustinsky, J;
  • Karatsu, K;
  • Kasai, M;
  • Kawagishi, T;
  • Kawall, D;
  • Kawashima, M;
  • Kazantsev, AV;
  • Kelly, S;
  • Kempel, T;
  • Khachatryan, V;
  • Khanzadeev, A;
  • Kijima, KM;
  • Kikuchi, J;
  • Kim, A;
  • Kim, BI;
  • Kim, C;
  • Kim, DH;
  • Kim, DJ;
  • Kim, E;
  • Kim, E-J;
  • Kim, HJ;
  • Kim, K-B;
  • Kim, M;
  • Kim, SH;
  • Kim, Y-J;
  • Kim, YK;
  • Kim, Y-S;
  • Kincses, D;
  • Kinney, E;
  • Kiriluk, K;
  • Kiss, Á;
  • Kistenev, E;
  • Kiyomichi, A;
  • Klatsky, J;
  • Klay, J;
  • Klein-Boesing, C;
  • Kleinjan, D;
  • Kline, P;
  • Kochenda, L;
  • Kochetkov, V;
  • Komatsu, Y;
  • Komkov, B;
  • Konno, M;
  • Koster, J;
  • Kotchetkov, D;
  • Kotov, D;
  • Kozlov, A;
  • Král, A;
  • Kravitz, A;
  • Krizek, F;
  • Kroon, PJ;
  • Kubart, J;
  • Kunde, GJ;
  • Kurgyis, B;
  • Kurihara, N;
  • Kurita, K;
  • Kurosawa, M;
  • Kweon, MJ;
  • Kwon, Y;
  • Kyle, GS;
  • Lacey, R;
  • Lai, YS;
  • Lajoie, JG;
  • Layton, D;
  • Lebedev, A;
  • Le Bornec, Y;
  • Leckey, S;
  • Lee, B;
  • Lee, DM;
  • Lee, J;
  • Lee, KB;
  • Lee, KS;
  • Lee, MK;
  • Lee, SH;
  • Lee, SR;
  • Lee, T;
  • Leitch, MJ;
  • Leite, MAL;
  • Leitgab, M;
  • Lenzi, B;
  • Leung, YH;
  • Lewis, B;
  • Lewis, NA;
  • Li, X;
  • Li, X;
  • Li, XH;
  • Lichtenwalner, P;
  • Liebing, P;
  • Lim, H;
  • Lim, SH;
  • Linden Levy, LA;
  • Liška, T;
  • Litvinenko, A;
  • Liu, H;
  • Liu, MX;
  • Lökös, S;
  • Love, B;
  • Lynch, D;
  • Maguire, CF;
  • Majoros, T;
  • Makdisi, YI;
  • Makek, M;
  • Malakhov, A;
  • Malik, MD;
  • Manion, A;
  • Manko, VI;
  • Mannel, E;
  • Mao, Y;
  • Mašek, L;
  • Masui, H;
  • Masumoto, S;
  • Matathias, F;
  • McCain, MC;
  • McCumber, M;
  • McGaughey, PL;
  • McGlinchey, D;
  • McKinney, C;
  • Means, N;
  • Mendoza, M;
  • Meredith, B;
  • Miake, Y;
  • Mibe, T;
  • Mignerey, AC;
  • Mihalik, DE;
  • Mikeš, P;
  • Miki, K;
  • Miller, TE;
  • Milov, A;
  • Mioduszewski, S;
  • Mishra, DK;
  • Mishra, GC;
  • Mishra, M;
  • Mitchell, JT;
  • Mitrovski, M;
  • Mitsuka, G;
  • Miyachi, Y;
  • Miyasaka, S;
  • Mohanty, AK;
  • Mohapatra, S;
  • Moon, HJ;
  • Moon, T;
  • Morino, Y;
  • Morreale, A;
  • Morrison, DP;
  • Morrow, SI;
  • Moss, JM;
  • Motschwiller, S;
  • Moukhanova, TV;
  • Mukhopadhyay, D;
  • Murakami, T;
  • Murata, J;
  • Mwai, A;
  • Nagae, T;
  • Nagamiya, S;
  • Nagashima, K;
  • Nagata, Y;
  • Nagle, JL;
  • Naglis, M;
  • Nagy, MI;
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  • Nakamiya, Y;
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  • Nattrass, C;
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  • Nguyen, M;
  • Nihashi, M;
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  • Novák, T;
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  • Tuli, SK;
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  • Tyurin, N;
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  • Valle, H;
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  • Vargyas, M;
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  • Veicht, A;
  • Velkovska, J;
  • Vértesi, R;
  • Vinogradov, AA;
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  • Wei, R;
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  • Wong, CP;
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  • Xie, W;
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  • Yamaura, K;
  • Yang, R;
  • Yanovich, A;
  • Yasin, Z;
  • Ying, J;
  • Yokkaichi, S;
  • Yoo, JH;
  • You, Z;
  • Young, GR;
  • Younus, I;
  • Yu, H;
  • Yushmanov, IE;
  • Zajc, WA;
  • Zaudtke, O;
  • Zelenski, A;
  • Zhang, C;
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  • Zhou, S;
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  • PHENIX Collaboration
  • et al.
Abstract

The PHENIX collaboration presents first measurements of low-momentum (0.41  GeV/c) direct-photon yield dN_{γ}^{dir}/dη is a smooth function of dN_{ch}/dη and can be well described as proportional to (dN_{ch}/dη)^{α} with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high p_{T} (>5  GeV/c), but when results from different collision energies are compared, an additional sqrt[s_{NN}]-dependent multiplicative factor is needed to describe the integrated-direct-photon yield.

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