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

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 Jr; 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; PHENIX Collaboration

doi:10.1103/PhysRevLett.101.162301

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

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

Authors

A Adare¹, 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 Jr, 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; PHENIX Collaboration

Affiliation

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.