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Energy dependence of $\pi^0$ production 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 Laurent Aphecetche 1 R. Armendariz S.H. Aronson J. Asai E. T. Atomssa 2 R. Averbeck T.C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri 3 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 3 K. Boyle M.L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. Muñoz Camacho S. Campbell B.S. Chang W.C. Chang J.-L. Charvet 3 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 4 P. Constantin M. Csanad T. Csorgo T. Dahms S. Dairaku K. Das G. David M.B. Deaton K. Dehmelt H. Delagrange 1 A. Denisov D. d'Enterria 2 A. Deshpande E.J. Desmond O. Dietzsch A. Dion M. Donadelli O. Drapier 2 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 2 S.L. Fokin Z. Fraenkel J.E. Frantz A. Franz A.D. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat 5 I. Garishvili A. Glenn H. Gong M. Gonin 2 J. Gosset 3 Y. Goto R. Granier de Cassagnac 2 N. Grau S.V. Greene M. Grosse Perdekamp T. Gunji H.-A. Gustafsson T. Hachiya A. Hadj Henni 1 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 4 F. Kajihara S. Kametani N. Kamihara J. Kamin M. Kaneta J.H. Kang H. Kanou J. Kapustinsky D. Kawall A.V. Kazantsev 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. Kral 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 Hong 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 3 V. Peresedov D.Yu. Peressounko C. Pinkenburg M.L. Purschke A.K. Purwar H. Qu J. Rak A. Rakotozafindrabe 2 I. Ravinovich K.F. Read S. Rembeczki M. Reuter K. Reygers V. Riabov Y. Riabov D. Roach G. Roche 5 S.D. Rolnick A. Romana 2 M. Rosati S.S.E. Rosendahl P. Rosnet 5 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 3 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 3 P.W. Stankus E. Stenlund M. Stepanov A. Ster S.P. Stoll T. Sugitate C. Suire 4 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. Tarjan H. Themann T.L. Thomas M. Togawa A. Toia J. Tojo L. Tomasek Y. Tomita H. Torii R.S. Towell V.-N. Tram 2 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. Zimanyi L. Zolin
Abstract : Neutral pion transverse momentum (pT) spectra at mid-rapidity (|y| < 0.35) were measured in Cu+Cu collisions at \sqrt s_NN = 22.4, 62.4, and 200 GeV. Relative to pi -zero yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (Ncoll) at the respective energies, the pi-zero yields for pT \ge 2 GeV/c in central Cu+Cu collisions at 62.4 and 200 GeV are suppressed, 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 GeV and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.
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Submitted on : Friday, February 1, 2008 - 10:58:56 AM
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A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Energy dependence of $\pi^0$ production in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 22.4, 62.4, and 200 GeV. Physical Review Letters, American Physical Society, 2008, 101, pp.162301. ⟨10.1103/PhysRevLett.101.162301⟩. ⟨in2p3-00232571⟩

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