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Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV

Title
Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV
Authors
Adare A.Afanasiev S.Aidala C.Ajitanand N.N.Akiba Y.Akimoto R.Al-Ta'Ani H.Alexander J.Angerami A.Aoki K.Apadula N.Aramaki Y.Asano H.Aschenauer E.C.Atomssa E.T.Awes T.C.Azmoun B.Babintsev V.Bai M.Bannier B.Barish K.N.Bassalleck B.Bathe S.Baublis V.Baumgart S.Bazilevsky A.Belmont R.Berdnikov A.Berdnikov Y.Bing X.Blau D.S.Boyle K.Brooks M.L.Buesching H.Bumazhnov V.Butsyk S.Campbell S.Castera P.Chen C.-H.Chi C.Y.Chiu M.Choi I.J.Choi J.B.Choi S.Choudhury R.K.Christiansen P.Chujo T.Chvala O.Cianciolo V.Citron Z.Cole B.A.Connors M.Csanad M.Csorgo T.Dairaku S.Datta A.Daugherity M.S.David G.Denisov A.Deshpande A.Desmond E.J.Dharmawardane K.V.Dietzsch O.Ding L.Dion A.Donadelli M.Drapier O.Drees A.Drees K.A.Durham J.M.Durum A.D'Orazio L.Edwards S.Efremenko Y.V.Engelmore T.Enokizono A.Esumi S.Eyser K.O.Fadem B.Fields D.E.Finger M.Fleuret F.Fokin S.L.Frantz J.E.Franz A.Frawley A.D.Fukao Y.Fusayasu T.Gainey K.Gal C.Garishvili A.Garishvili I.Glenn A.Gong X.Gonin M.Goto Y.Granier De Cassagnac R.Grau N.Greene S.V.Grosse Perdekamp M.Gunji T.Guo L.Gustafsson H.-A.Hachiya T.Haggerty J.S.Hahn K.I.Hamagaki H.Hanks J.Hashimoto K.Haslum E.Hayano R.He X.Hemmick T.K.Hester T.Hill J.C.Hollis R.S.Homma K.Hong B.Horaguchi T.Hori Y.Huang S.Ichihara T.Iinuma H.Ikeda Y.Imrek J.Inaba M.Iordanova A.Isenhower D.Issah M.Isupov A.Ivanischev D.Jacak B.V.Javani M.Jia J.Jiang X.Johnson B.M.Joo K.S.Jouan D.Kamin J.Kaneti S.Kang B.H.Kang J.H.Kang J.S.Kapustinsky J.Karatsu K.Kasai M.Kawall D.Kazantsev A.V.Kempel T.Khanzadeev A.Kijima K.M.Kim B.I.Kim C.Kim D.J.Kim E.-J.Kim H.J.Kim K.-B.Kim Y.-J.Kim Y.K.Kinney E.Kiss A.Kistenev E.Klatsky J.Kleinjan D.Kline P.Komatsu Y.Komkov B.Koster J.Kotchetkov D.Kotov D.Kral A.Krizek F.Kunde G.J.Kurita K.Kurosawa M.Kwon Y.Kyle G.S.Lacey R.Lai Y.S.Lajoie J.G.Lebedev A.Lee B.Lee D.M.Lee J.Lee K.B.Lee K.S.Lee S.H.Lee S.R.Leitch M.J.Leite M.A.L.Leitgab M.Lewis B.Lim S.H.Linden Levy L.A.Litvinenko A.Liu M.X.Love B.Maguire C.F.Makdisi Y.I.Makek M.Malakhov A.Manion A.Manko V.I.Mannel E.Masumoto S.McCumber M.McGaughey P.L.McGlinchey D.McKinney C.Mendoza M.Meredith B.Miake Y.Mibe T.Mignerey A.C.Milov A.Mishra D.K.Mitchell J.T.Miyachi Y.Miyasaka S.Mohanty A.K.Moon H.J.Morrison D.P.Motschwiller S.Moukhanova T.V.Murakami T.Murata J.Nagae T.Nagamiya S.Nagle J.L.Nagy M.I.Nakagawa I.Nakamiya Y.Nakamura K.R.Nakamura T.Nakano K.Nattrass C.Nederlof A.Nihashi M.Nouicer R.Novitzky N.Nyanin A.S.O'Brien E.Ogilvie C.A.Okada K.Oskarsson A.Ouchida M.Ozawa K.Pak R.Pantuev V.Papavassiliou V.Park B.H.Park I.H.Park S.K.Pate S.F.Patel L.Pei H.Peng J.-C.Pereira H.Peresedov V.Peressounko D.Y.Petti R.Pinkenburg C.Pisani R.P.Proissl M.Purschke M.L.Qu H.Rak J.Ravinovich I.Read K.F.Reynolds R.Riabov V.Riabov Y.Richardson E.Roach D.Roche G.Rolnick S.D.Rosati M.Rukoyatkin P.Sahlmueller B.Saito N.Sakaguchi T.Samsonov V.Sano M.Sarsour M.Sawada S.Sedgwick K.Seidl R.Sen A.Seto R.Sharma D.Shein I.Shibata T.-A.Shigaki K.Shimomura M.Shoji K.Shukla P.Sickles A.Silva C.L.Silvermyr D.Sim K.S.Singh B.K.Singh C.P.Singh V.Slunecka M.Soltz R.A.Sondheim W.E.Sorensen S.P.Soumya M.Sourikova I.V.Stankus P.W.Stenlund E.Stepanov M.Ster A.Stoll S.P.Sugitate T.Sukhanov A.Sun J.Sziklai J.Takagui E.M.Takahara A.Taketani A.Tanaka Y.Taneja S.Tanida K.Tannenbaum M.J.Tarafdar S.Taranenko A.Tennant E.Themann H.Todoroki T.Tomaek L.Tomaek M.Torii H.Towell R.S.Tserruya I.Tsuchimoto Y.Tsuji T.Vale C.Van Hecke H.W.Vargyas M.Vazquez-Zambrano E.Veicht A.Velkovska J.Vertesi R.Virius M.Vossen A.Vrba V.Vznuzdaev E.Wang X.R.Watanabe D.Watanabe K.Watanabe Y.Watanabe Y.S.Wei F.Wei R.White S.N.Winter D.Wolin S.Woody C.L.Wysocki M.Yamaguchi Y.L.Yang R.Yanovich A.Ying J.Yokkaichi S.You Z.Younus I.Yushmanov I.E.Zajc W.A.Zelenski A.Zolin L.
Ewha Authors
한인식박일흥
SCOPUS Author ID
한인식scopus
Issue Date
2012
Journal Title
Physical Review Letters
ISSN
0031-9007JCR Link
Citation
vol. 109, no. 15
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Neutral-pion π0 spectra were measured at midrapidity (

y

<0.35) in Au+Au collisions at √s NN=39 and 62.4GeV and compared with earlier measurements at 200GeV in a transverse-momentum range of 1<p T<10GeV/c. The high-p T tail is well described by a power law in all cases, and the powers decrease significantly with decreasing center-of-mass energy. The change of powers is very similar to that observed in the corresponding spectra for p+p collisions. The nuclear modification factors (R AA) show significant suppression, with a distinct energy, centrality, and p T dependence. Above p T=7GeV/c, R AA is similar for √s NN=62.4 and 200GeV at all centralities. Perturbative-quantum-chromodynamics calculations that describe R AA well at 200GeV fail to describe the 39GeV data, raising the possibility that, for the same p T region, the relative importance of initial-state effects and soft processes increases at lower energies. The p T range where π0 spectra in central Au+Au collisions have the same power as in p+p collisions is 5 and 7GeV/c for √s NN=200 and 62.4GeV, respectively. For the √s NN=39GeV data, it is not clear whether such a region is reached, and the x T dependence of the x T-scaling power-law exponent is very different from that observed in the √s NN=62 and 200GeV data, providing further evidence that initial-state effects and soft processes mask the in-medium suppression of hard-scattered partons to higher p T as the collision energy decreases. © 2012 American Physical Society.
DOI
10.1103/PhysRevLett.109.152301
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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