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Low-momentum direct-photon measurement in Cu plus Cu collisions at root S-NN=200 GeV

Authors
Adare, A.Afanasiev, S.Aidala, C.Ajitanand, N. N.Akiba, Y.Al-Bataineh, H.Alexander, J.Alfred, M.Aoki, K.Aphecetche, L.Armendariz, R.Aronson, S. H.Asai, J.Atomssa, E. T.Averbeck, R.Awes, T. C.Azmoun, B.Babintsev, VBagoly, A.Baksay, G.Baksay, L.Baldisseri, A.Barish, K. N.Barnes, P. D.Bassalleck, B.Bathe, S.Batsouli, S.Baublis, VBazilevsky, A.Belikov, S.Belmont, R.Bennett, R.Berdnikov, A.Berdnikov, Y.Bickley, A. A.Boer, M.Boissevain, J. G.Bok, J. S.Borel, H.Boyle, K.Brooks, M. L.Bryslawskyj, J.Buesching, H.Bumazhnov, VBunce, G.Butsyk, S.Campbell, S.Roman, V. CanoaChang, B. S.Charvet, J-LChernichenko, S.Chi, C. Y.Chiba, J.Chiu, M.Choi, I. J.Chujo, T.Chung, P.Churyn, A.Cianciolo, VCleven, C. R.Cole, B. A.Comets, M. P.Connors, M.Constantin, P.Csanad, M.Csorgo, T.Dahms, T.Danley, T. W.Das, K.David, G.Deaton, M. B.Dehmelt, K.Delagrange, H.Denisov, A.d'Enterria, D.Deshpande, A.Desmond, E. J.Dietzsch, O.Dion, A.Do, J. H.Donadelli, M.Drapier, O.Drees, A.Dubey, A. K.Durham, J. M.Durum, A.Dzhordzhadze, VEfremenko, Y., VEgdemir, J.Ellinghaus, F.Emam, W. S.Enokizono, A.En'yo, H.Esumi, S.Eyser, K. O.Fan, W.Feege, N.Fields, D. E.Finger, M.Jr, JrFleuret, F.Fokin, S. L.Fraenkel, Z.Frantz, J. E.Franz, A.Frawley, A. D.Fujiwara, K.Fukao, Y.Fusayasu, T.Gadrat, S.Gallus, P.Garg, P.Garishvili, IGe, H.Glenn, A.Gong, H.Gonin, M.Gosset, J.Goto, Y.de Cassagnac, R. GranierGrau, N.Greene, S., VPerdekamp, M. GrosseGunji, T.Gustafsson, H-AHachiya, T.Henni, A. HadjHaegemann, C.Haggerty, J. S.Hamagaki, H.Han, R.Harada, H.Hartouni, E. P.Haruna, K.Hasegawa, S.Haseler, T. O. S.Haslum, E.Hayano, R.He, X.Heffner, M.Hemmick, T. K.Hester, T.Hiejima, H.Hill, J. C.Hill, K.Hobbs, R.Hodges, A.Hohlmann, M.Holzmann, W.Homma, K.Hong, B.Horaguchi, T.Hornback, D.Hoshino, T.Hotvedt, N.Huang, J.Ichihara, T.Iinuma, H.Imai, K.Inaba, M.Inoue, Y.Isenhower, D.Isenhower, L.Ishihara, M.Isobe, T.Issah, M.Isupov, A.Ivanishchev, D.Jacak, B., VJi, Z.Jia, J.Jin, J.Jinnouchi, O.Johnson, B. M.Joo, K. S.Jouan, D.Kajihara, F.Kametani, S.Kamihara, N.Kamin, J.Kaneta, M.Kang, J. H.Kanou, H.Kawall, D.Kazantsev, A., VKhachatryan, VKhanzadeev, A.Kikuchi, J.Kim, D. H.Kim, D. J.Kim, E.Kim, E-JKim, M.Kincses, D.Kinney, E.Kiss, A.Kistenev, E.Kiyomichi, A.Klay, J.Klein-Boesing, C.Kochenda, L.Kochetkov, VKomkov, B.Konno, M.Kotchetkov, D.Kotov, D.Kozlov, A.Kral, A.Kravitz, A.Kubart, J.Kunde, G. J.Kurgyis, B.Kurihara, N.Kurita, K.Kweon, M. J.Kwon, Y.Kyle, G. S.Lacey, R.Lai, Y. S.Lajoie, J. G.Lebedev, A.Lee, D. M.Lee, M. K.Lee, S. H.Lee, T.Leitch, M. J.Leite, M. A. L.Lenzi, B.Leung, Y. H.Lewis, N. A.Li, X.Lim, S. H.Liska, T.Litvinenko, A.Liu, M. X.Lokos, S.Love, B.Lynch, D.Maguire, C. F.Majoros, T.Makdisi, Y., IMalakhov, A.Malik, M. D.Manko, V., IMao, Y.Masek, L.Masui, H.Matathias, F.McCumber, M.McGaughey, P. L.McGlinchey, D.Miake, Y.Mignerey, A. C.Mihalik, D. E.Mikes, P.Miki, K.Miller, T. E.Milov, A.Mioduszewski, S.Mishra, M.Mitchell, J. T.Mitrovski, M.Mitsuka, G.Moon, T.Morreale, A.Morrison, D. P.Morrow, S., IMoukhanova, T., VMukhopadhyay, D.Murata, J.Nagamiya, S.Nagashima, K.Nagata, Y.Nagle, J. L.Naglis, M.Nakagawa, INakamiya, Y.Nakamura, T.Nakano, K.Newby, J.Nguyen, M.Norman, B. E.Nouicer, R.Novak, T.Novitzky, N.Nyanin, A. S.O'Brien, E.Oda, S. X.Ogilvie, C. A.Ohnishi, H.Oka, M.Okada, K.Omiwade, O. O.Koop, J. D. OrjuelaOsborn, J. D.Oskarsson, A.Ouchida, M.Ozawa, K.Pak, R.Pal, D.Palounek, A. P. T.Pantuev, VPapavassiliou, VPark, J.Park, S.Park, W. J.Pate, S. F.Patel, M.Pei, H.Peng, J-CPeng, W.Pereira, H.Perepelitsa, D., VPeresedov, VPeressounko, D. YuPerezLara, C. E.Pinkenburg, C.Purschke, M. L.Purwar, A. K.Qu, H.Radzevich, P., VRak, J.Rakotozafindrabe, A.Ravinovich, IRead, K. F.Rembeczki, S.Reuter, M.Reygers, K.Riabov, VRiabov, Y.Richford, D.Rinn, T.Roche, G.Romana, A.Rosati, M.Rosendahl, S. S. E.Rosnet, P.Rowan, Z.Rukoyatkin, P.Runchey, J.Rykov, V. L.Sahlmueller, B.Saito, N.Sakaguchi, T.Sakai, S.Sakata, H.Sako, H.Samsonov, VSarsour, M.Sato, S.Sawada, S.Schmoll, B. K.Seele, J.Seidl, R.Semenov, VSeto, R.Sharma, D.Shein, IShevel, A.Shibata, T-AShigaki, K.Shimomura, M.Shoji, K.Sickles, A.Silva, C. L.Silvermyr, D.Silvestre, C.Sim, K. S.Singh, C. P.Singh, VSkoby, M. J.Skutnik, S.Slunecka, M.Soldatov, A.Soltz, R. A.Sondheim, W. E.Sorensen, S. P.Sourikova, I., VStaley, F.Stankus, P. W.Stenlund, E.Stepanov, M.Ster, A.Stoll, S. P.Sugitate, T.Suire, C.Sun, Z.Sziklai, J.Tabaru, T.Takagi, S.Takagui, E. M.Taketani, A.Tanaka, Y.Tanida, K.Tannenbaum, M. J.Taranenko, A.Tarjan, P.Thomas, T. L.Tieulent, R.Togawa, M.Toia, A.Tojo, J.Tomasek, L.Torii, H.Towell, R. S.Tram, V-NTserruya, ITsuchimoto, Y.Ueda, Y.Ujvari, B.Vale, C.Valle, H.van Hecke, H. W.Velkovska, J.Vertesi, R.Vinogradov, A. A.Virius, M.Vrba, V.Vznuzdaev, E.Wagner, M.Walker, D.Wang, X. R.Watanabe, D.Watanabe, Y.Wei, F.Wessels, J.White, S. N.Winter, D.Wong, C. P.Woody, C. L.Wysocki, M.Xie, W.Xu, C.Xu, Q.Yamaguchi, Y. L.Yanovich, A.Yasin, Z.Ying, J.Yokkaichi, S.Yoo, J. H.Young, G. R.Younus, IYu, H.Yushmanov, I. E.Zajc, W. A.Zaudtke, O.Zhang, C.Zharko, S.Zhou, S.Zimamyi, J.Zolin, L.Zou, L.
Issue Date
15-11월-2018
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW C, v.98, no.5
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW C
Volume
98
Number
5
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/71838
DOI
10.1103/PhysRevC.98.054902
ISSN
2469-9985
Abstract
We measured direct photons for p(T) < 5 GeV/c in minimum bias and 0%-40% most-central events at midrapidity for Cu+Cu collisions at root S-NN = 200 GeV. The e(+)e(-) contribution from quasireal direct virtual photons has been determined as an excess over the known hadronic contributions in the e(+)e(-) mass distribution. A clear enhancement of photons over the binary scaled p+p fit is observed for p(T) < 4 GeV/c in Cu+Cu data. The p(T) spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the p+p baseline are 285 +/- 53 (stat) +/- 57(syst) MeV/c and 333 +/- 72(stat) +/- 45(syst) MeV/c for minimum bias and 0%-40% most-central events, respectively. The rapidity density, dN / dy, of photons demonstrates the same power law as a function of dN(ch)/d eta observed in Au+Au at the same collision energy.
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