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. 2012 Oct 12;109(15):152301.
doi: 10.1103/PhysRevLett.109.152301. Epub 2012 Oct 9.

Evolution of π(0) suppression in Au+Au collisions from √(s(NN))=39 to 200 GeV

A Adare  1 , S Afanasiev, C Aidala, N N Ajitanand, Y Akiba, R Akimoto, H Al-Ta'ani, J Alexander, A Angerami, K Aoki, N Apadula, Y Aramaki, H Asano, E C Aschenauer, E T Atomssa, T C Awes, B Azmoun, V Babintsev, M Bai, B Bannier, K N Barish, B Bassalleck, S Bathe, V Baublis, S Baumgart, A Bazilevsky, R Belmont, A Berdnikov, Y Berdnikov, X Bing, D S Blau, K Boyle, M L Brooks, H Buesching, V Bumazhnov, S Butsyk, S Campbell, P Castera, C-H Chen, C Y Chi, M Chiu, I J Choi, J B Choi, S Choi, R K Choudhury, P Christiansen, T Chujo, O Chvala, V Cianciolo, Z Citron, B A Cole, M Connors, M Csanád, T Csörgő, S Dairaku, A Datta, M S Daugherity, G David, A Denisov, A Deshpande, E J Desmond, K V Dharmawardane, O Dietzsch, L Ding, A Dion, M Donadelli, O Drapier, A Drees, K A Drees, J M Durham, A Durum, L D'Orazio, S Edwards, Y V Efremenko, T Engelmore, A Enokizono, S Esumi, K O Eyser, B Fadem, D E Fields, M Finger, M Finger Jr, F Fleuret, S L Fokin, J E Frantz, A Franz, A D Frawley, Y Fukao, T Fusayasu, K Gainey, C Gal, A Garishvili, I Garishvili, A Glenn, X Gong, M Gonin, Y Goto, R Granier de Cassagnac, N Grau, S V Greene, M Grosse Perdekamp, T Gunji, L Guo, H-Å Gustafsson, T Hachiya, J S Haggerty, K I Hahn, H Hamagaki, J Hanks, K Hashimoto, E Haslum, R Hayano, X He, T K Hemmick, T Hester, J C Hill, R S Hollis, K Homma, B Hong, T Horaguchi, Y Hori, S Huang, T Ichihara, H Iinuma, Y Ikeda, J Imrek, M Inaba, A Iordanova, D Isenhower, M Issah, A Isupov, D Ivanischev, B V Jacak, M Javani, J Jia, X Jiang, B M Johnson, K S Joo, D Jouan, J Kamin, S Kaneti, B H Kang, J H Kang, J S Kang, J Kapustinsky, K Karatsu, M Kasai, D Kawall, A V Kazantsev, T Kempel, A Khanzadeev, K M Kijima, B I Kim, C Kim, D J Kim, E-J Kim, H J Kim, K-B Kim, Y-J Kim, Y K Kim, E Kinney, A Kiss, E Kistenev, J Klatsky, D Kleinjan, P Kline, Y Komatsu, B Komkov, J Koster, D Kotchetkov, D Kotov, A Král, F Krizek, G J Kunde, K Kurita, M Kurosawa, Y Kwon, G S Kyle, R Lacey, Y S Lai, J G Lajoie, A Lebedev, B Lee, D M Lee, J Lee, K B Lee, K S Lee, S H Lee, S R Lee, M J Leitch, M A L Leite, M Leitgab, B Lewis, S H Lim, L A Linden Levy, A Litvinenko, M X Liu, B Love, C F Maguire, Y I Makdisi, M Makek, A Malakhov, A Manion, V I Manko, E Mannel, S Masumoto, M McCumber, P L McGaughey, D McGlinchey, C McKinney, M Mendoza, B Meredith, Y Miake, T Mibe, A C Mignerey, A Milov, D K Mishra, J T Mitchell, Y Miyachi, S Miyasaka, A K Mohanty, H J Moon, D P Morrison, S Motschwiller, T V Moukhanova, T Murakami, J Murata, T Nagae, S Nagamiya, J L Nagle, M I Nagy, I Nakagawa, Y Nakamiya, K R Nakamura, T Nakamura, K Nakano, C Nattrass, A Nederlof, M Nihashi, R Nouicer, N Novitzky, A S Nyanin, E O'Brien, C A Ogilvie, K Okada, A Oskarsson, M Ouchida, K Ozawa, R Pak, V Pantuev, V Papavassiliou, B H Park, I H Park, S K Park, S F Pate, L Patel, H Pei, J-C Peng, H Pereira, V Peresedov, D Yu Peressounko, R Petti, C Pinkenburg, R P Pisani, M Proissl, M L Purschke, H Qu, J Rak, I Ravinovich, K F Read, R Reynolds, V Riabov, Y Riabov, E Richardson, D Roach, G Roche, S D Rolnick, M Rosati, P Rukoyatkin, B Sahlmueller, N Saito, T Sakaguchi, V Samsonov, M Sano, M Sarsour, S Sawada, K Sedgwick, R Seidl, A Sen, R Seto, D Sharma, I Shein, T-A Shibata, K Shigaki, M Shimomura, K Shoji, P Shukla, A Sickles, C L Silva, D Silvermyr, K S Sim, B K Singh, C P Singh, V Singh, M Slunečka, R A Soltz, W E Sondheim, S P Sorensen, M Soumya, I V Sourikova, P W Stankus, E Stenlund, M Stepanov, A Ster, S P Stoll, T Sugitate, A Sukhanov, J Sun, J Sziklai, E M Takagui, A Takahara, A Taketani, Y Tanaka, S Taneja, K Tanida, M J Tannenbaum, S Tarafdar, A Taranenko, E Tennant, H Themann, T Todoroki, L Tomášek, M Tomášek, H Torii, R S Towell, I Tserruya, Y Tsuchimoto, T Tsuji, C Vale, H W van Hecke, M Vargyas, E Vazquez-Zambrano, A Veicht, J Velkovska, R Vértesi, M Virius, A Vossen, V Vrba, E Vznuzdaev, X R Wang, D Watanabe, K Watanabe, Y Watanabe, Y S Watanabe, F Wei, R Wei, S N White, D Winter, S Wolin, C L Woody, M Wysocki, Y L Yamaguchi, R Yang, A Yanovich, J Ying, S Yokkaichi, Z You, I Younus, I E Yushmanov, W A Zajc, A Zelenski, L Zolin; PHENIX Collaboration
Affiliations

Evolution of π(0) suppression in Au+Au collisions from √(s(NN))=39 to 200 GeV

A Adare et al. Phys Rev Lett. .

Erratum in

  • Erratum: Evolution of π^{0} Suppression in Au+Au Collisions from sqrt[s_{NN}]=39 to 200 GeV [Phys. Rev. Lett. 109, 152301 (2012)].
    Adare A, Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Akimoto R, Al-Ta'ani H, Alexander J, Angerami A, Aoki K, Apadula N, Aramaki Y, Asano H, Aschenauer EC, Atomssa ET, Awes TC, Azmoun B, Babintsev V, Bai M, Bannier B, Barish KN, Bassalleck B, Bathe S, Baublis V, Baumgart S, Bazilevsky A, Belmont R, Berdnikov A, Berdnikov Y, Bing X, Blau DS, Boyle K, Brooks ML, Buesching H, Bumazhnov V, Butsyk S, Campbell S, Castera P, Chen CH, Chi CY, Chiu M, Choi IJ, Choi JB, Choi S, Choudhury RK, Christiansen P, Chujo T, Chvala O, Cianciolo V, Citron Z, Cole BA, Connors M, Csanád M, Csörgő T, Dairaku S, Datta A, Daugherity MS, David G, Denisov A, Deshpande A, Desmond EJ, Dharmawardane KV, Dietzsch O, Ding L, Dion A, Donadelli M, Drapier O, Drees A, Drees KA, Durham JM, Durum A, D'Orazio L, Edwards S, Efremenko YV, Engelmore T, Enokizono A, Esumi S, Eyser KO, Fadem B, Fields DE, Finger M, Finger M, Fleuret F, Fokin SL, Frantz JE, Franz A, Frawley AD, 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 SV, Grosse Perdekamp M, Gunji T, Guo L, Gustafsson HÅ, Hachiya T, Haggerty JS, Hahn KI, Hamagaki H, Hanks J, … See abstract for full author list ➔ Adare A, et al. Phys Rev Lett. 2020 Jul 24;125(4):049901. doi: 10.1103/PhysRevLett.125.049901. Phys Rev Lett. 2020. PMID: 32794791

Abstract

Neutral-pion π(0) spectra were measured at midrapidity (|y|<0.35) in Au+Au collisions at √(s(NN))=39 and 62.4 GeV and compared with earlier measurements at 200 GeV in a transverse-momentum range of 1<p(T)<10 GeV/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)=7 GeV/c, R(AA) is similar for √(s(NN))=62.4 and 200 GeV at all centralities. Perturbative-quantum-chromodynamics calculations that describe R(AA) well at 200 GeV fail to describe the 39 GeV 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 π(0) spectra in central Au+Au collisions have the same power as in p+p collisions is ≈5 and 7 GeV/c for √(s(NN))=200 and 62.4 GeV, respectively. For the √(s(NN))=39 GeV 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 200 GeV 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.

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