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Phys Rev Lett. 2008 Oct 17;101(16):162301. doi: 10.1103/PhysRevLett.101.162301. Epub 2008 Oct 15.

Onset of pi(0) suppression studied in Cu+Cu collisions at sqrt S NN=22.4, 62.4, and 200 GeV.

Physical review letters

A Adare, S Afanasiev, C Aidala, N N Ajitanand, Y Akiba, H Al-Bataineh, J Alexander, K Aoki, L Aphecetche, R Armendariz, S H Aronson, J Asai, E T Atomssa, R Averbeck, T C Awes, B Azmoun, V Babintsev, M Bai, G Baksay, L Baksay, A Baldisseri, K N Barish, P D Barnes, B Bassalleck, A T Basye, S Bathe, S Batsouli, V Baublis, C Baumann, A Bazilevsky, S Belikov, R Bennett, A Berdnikov, Y Berdnikov, A A Bickley, J G Boissevain, H Borel, K Boyle, M L Brooks, H Buesching, V Bumazhnov, G Bunce, S Butsyk, C M Camacho, S Campbell, B S Chang, W C Chang, J-L Charvet, S Chernichenko, J Chiba, C Y Chi, M Chiu, I J Choi, R K Choudhury, T Chujo, P Chung, A Churyn, V Cianciolo, Z Citron, C R Cleven, B A Cole, M P Comets, P Constantin, M Csanád, T Csörgo, T Dahms, S Dairaku, K Das, G David, M B Deaton, K Dehmelt, H Delagrange, A Denisov, D d'Enterria, A Deshpande, E J Desmond, O Dietzsch, A Dion, M Donadelli, O Drapier, A Drees, K A Drees, A K Dubey, A Durum, D Dutta, V Dzhordzhadze, Y V Efremenko, J Egdemir, F Ellinghaus, W S Emam, T Engelmore, A Enokizono, H En'yo, S Esumi, K O Eyser, B Fadem, D E Fields, M Finger, M Finger, F Fleuret, S L Fokin, Z Fraenkel, J E Frantz, A Franz, A D Frawley, K Fujiwara, Y Fukao, T Fusayasu, S Gadrat, I Garishvili, A Glenn, H Gong, M Gonin, J Gosset, Y Goto, R Granier de Cassagnac, N Grau, S V Greene, M Grosse Perdekamp, T Gunji, H-A Gustafsson, T Hachiya, A Hadj Henni, C Haegemann, J S Haggerty, H Hamagaki, R Han, H Harada, E P Hartouni, K Haruna, E Haslum, R Hayano, M Heffner, T K Hemmick, T Hester, X He, H Hiejima, J C Hill, R Hobbs, M Hohlmann, W Holzmann, K Homma, B Hong, T Horaguchi, D Hornback, S Huang, T Ichihara, R Ichimiya, Y Ikeda, K Imai, J Imrek, M Inaba, Y Inoue, D Isenhower, L Isenhower, M Ishihara, T Isobe, M Issah, A Isupov, D Ivanischev, B V Jacak, J Jia, J Jin, O Jinnouchi, B M Johnson, K S Joo, D Jouan, F Kajihara, S Kametani, N Kamihara, J Kamin, M Kaneta, J H Kang, H Kanou, J Kapustinsky, D Kawall, A V Kazantsev, T Kempel, A Khanzadeev, K M Kijima, J Kikuchi, B I Kim, D H Kim, D J Kim, E Kim, S H Kim, E Kinney, K Kiriluk, A Kiss, E Kistenev, A Kiyomichi, J Klay, C Klein-Boesing, L Kochenda, V Kochetkov, B Komkov, M Konno, J Koster, D Kotchetkov, A Kozlov, A Král, A Kravitz, J Kubart, G J Kunde, N Kurihara, K Kurita, M Kurosawa, M J Kweon, Y Kwon, G S Kyle, R Lacey, Y-S Lai, Y S Lai, J G Lajoie, D Layton, A Lebedev, D M Lee, K B Lee, M K Lee, T Lee, M J Leitch, M A L Leite, B Lenzi, P Liebing, T Liska, A Litvinenko, H Liu, M X Liu, X Li, B Love, D Lynch, C F Maguire, Y I Makdisi, A Malakhov, M D Malik, V I Manko, E Mannel, Y Mao, L Masek, H Masui, F Matathias, M McCumber, P L McGaughey, N Means, B Meredith, Y Miake, P Mikes, K Miki, T E Miller, A Milov, S Mioduszewski, M Mishra, J T Mitchell, M Mitrovski, A K Mohanty, Y Morino, A Morreale, D P Morrison, T V Moukhanova, D Mukhopadhyay, J Murata, S Nagamiya, Y Nagata, J L Nagle, M Naglis, M I Nagy, I Nakagawa, Y Nakamiya, T Nakamura, K Nakano, J Newby, M Nguyen, T Niita, B E Norman, R Nouicer, A S Nyanin, E O'Brien, S X Oda, C A Ogilvie, H Ohnishi, H Okada, K Okada, M Oka, O O Omiwade, Y Onuki, A Oskarsson, M Ouchida, K Ozawa, R Pak, D Pal, A P T Palounek, V Pantuev, V Papavassiliou, J Park, W J Park, S F Pate, H Pei, J-C Peng, H Pereira, V Peresedov, D Yu Peressounko, C Pinkenburg, M L Purschke, A K Purwar, H Qu, J Rak, A Rakotozafindrabe, I Ravinovich, K F Read, S Rembeczki, M Reuter, K Reygers, V Riabov, Y Riabov, D Roach, G Roche, S D Rolnick, A Romana, M Rosati, S S E Rosendahl, P Rosnet, P Rukoyatkin, P Ruzicka, V L Rykov, B Sahlmueller, N Saito, T Sakaguchi, S Sakai, K Sakashita, H Sakata, V Samsonov, S Sato, T Sato, S Sawada, K Sedgwick, J Seele, R Seidl, A Yu Semenov, V Semenov, R Seto, D Sharma, I Shein, A Shevel, T-A Shibata, K Shigaki, M Shimomura, K Shoji, P Shukla, A Sickles, C L Silva, D Silvermyr, C Silvestre, K S Sim, B K Singh, C P Singh, V Singh, S Skutnik, M Slunecka, A Soldatov, R A Soltz, W E Sondheim, S P Sorensen, I V Sourikova, F Staley, P W Stankus, E Stenlund, M Stepanov, A Ster, S P Stoll, T Sugitate, C Suire, A Sukhanov, J Sziklai, T Tabaru, S Takagi, E M Takagui, A Taketani, R Tanabe, Y Tanaka, K Tanida, M J Tannenbaum, A Taranenko, P Tarján, H Themann, T L Thomas, M Togawa, A Toia, J Tojo, L Tomásek, Y Tomita, H Torii, R S Towell, V-N Tram, I Tserruya, Y Tsuchimoto, C Vale, H Valle, H W vanHecke, A Veicht, J Velkovska, R Vertesi, A A Vinogradov, M Virius, V Vrba, E Vznuzdaev, M Wagner, D Walker, X R Wang, Y Watanabe, F Wei, J Wessels, S N White, D Winter, C L Woody, M Wysocki, W Xie, Y L Yamaguchi, K Yamaura, R Yang, A Yanovich, Z Yasin, J Ying, S Yokkaichi, G R Young, I Younus, I E Yushmanov, W A Zajc, O Zaudtke, C Zhang, S Zhou, J Zimányi, L Zolin,

Affiliations

  1. University of Colorado, Boulder, Colorado 80309, USA.

PMID: 18999660 DOI: 10.1103/PhysRevLett.101.162301

Abstract

Neutral pion transverse momentum (p(T)) spectra at midrapidity (|y| less than or approximately 0.35) were measured in Cu+Cu collisions at sqrt[s(NN)]=22.4, 62.4, and 200 GeV. Relative to pi_(0) yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (N(coll) the pi_(0) yields for p(T) more than or approximately 2 GeV/c in central Cu+Cu collisions are suppressed at 62.4 and 200 GeV whereas an enhancement is observed at 22.4 GeV. A comparison with a jet-quenching model suggests that final state parton energy loss dominates in central Cu+Cu collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.

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