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

A. Adare, 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 & 352 others 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. Csörgo, 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, 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. A. 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, Byungsik 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, Sung Keun 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. Tomáek, M. Tomáek, 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

Research output: Contribution to journalArticle

39 Citations (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.

Original languageEnglish
Article number152301
JournalPhysical Review Letters
Volume109
Issue number15
DOIs
Publication statusPublished - 2012 Oct 9

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retarding
collisions
energy
transverse momentum
partons
center of mass
pions
masks
quantum chromodynamics
exponents
scaling

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Akimoto, R., ... Zolin, L. (2012). Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV. Physical Review Letters, 109(15), [152301]. https://doi.org/10.1103/PhysRevLett.109.152301

Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV. / 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.; Csanád, M.; Csörgo, 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.; 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, Byungsik; 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.; Král, 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, Sung Keun; Pate, S. F.; Patel, L.; Pei, H.; Peng, J. C.; Pereira, H.; Peresedov, V.; Peressounko, D. Yu; 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.; Slunečka, 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.; Tomáek, L.; Tomáek, 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.; Vértesi, 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.

In: Physical Review Letters, Vol. 109, No. 15, 152301, 09.10.2012.

Research output: Contribution to journalArticle

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, Csörgo, 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, HA, Hachiya, T, Haggerty, JS, Hahn, KI, Hamagaki, H, Hanks, J, Hashimoto, K, Haslum, E, Hayano, R, He, X, Hemmick, TK, Hester, T, Hill, JC, Hollis, RS, 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, BV, Javani, M, Jia, J, Jiang, X, Johnson, BM, Joo, KS, Jouan, D, Kamin, J, Kaneti, S, Kang, BH, Kang, JH, Kang, JS, Kapustinsky, J, Karatsu, K, Kasai, M, Kawall, D, Kazantsev, AV, Kempel, T, Khanzadeev, A, Kijima, KM, Kim, BI, Kim, C, Kim, DJ, Kim, EJ, Kim, HJ, Kim, KB, Kim, YJ, Kim, YK, Kinney, E, Kiss, A, Kistenev, E, Klatsky, J, Kleinjan, D, Kline, P, Komatsu, Y, Komkov, B, Koster, J, Kotchetkov, D, Kotov, D, Král, A, Krizek, F, Kunde, GJ, Kurita, K, Kurosawa, M, Kwon, Y, Kyle, GS, Lacey, R, Lai, YS, Lajoie, JG, Lebedev, A, Lee, B, Lee, DM, Lee, J, Lee, KB, Lee, KS, Lee, SH, Lee, SR, Leitch, MJ, Leite, MAL, Leitgab, M, Lewis, B, Lim, SH, Linden Levy, LA, Litvinenko, A, Liu, MX, Love, B, Maguire, CF, Makdisi, YI, Makek, M, Malakhov, A, Manion, A, Manko, VI, Mannel, E, Masumoto, S, McCumber, M, McGaughey, PL, McGlinchey, D, McKinney, C, Mendoza, M, Meredith, B, Miake, Y, Mibe, T, Mignerey, AC, Milov, A, Mishra, DK, Mitchell, JT, Miyachi, Y, Miyasaka, S, Mohanty, AK, Moon, HJ, Morrison, DP, Motschwiller, S, Moukhanova, TV, Murakami, T, Murata, J, Nagae, T, Nagamiya, S, Nagle, JL, Nagy, MI, Nakagawa, I, Nakamiya, Y, Nakamura, KR, Nakamura, T, Nakano, K, Nattrass, C, Nederlof, A, Nihashi, M, Nouicer, R, Novitzky, N, Nyanin, AS, O'Brien, E, Ogilvie, CA, Okada, K, Oskarsson, A, Ouchida, M, Ozawa, K, Pak, R, Pantuev, V, Papavassiliou, V, Park, BH, Park, IH, Park, SK, Pate, SF, Patel, L, Pei, H, Peng, JC, Pereira, H, Peresedov, V, Peressounko, DY, Petti, R, Pinkenburg, C, Pisani, RP, Proissl, M, Purschke, ML, Qu, H, Rak, J, Ravinovich, I, Read, KF, Reynolds, R, Riabov, V, Riabov, Y, Richardson, E, Roach, D, Roche, G, Rolnick, SD, 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, TA, Shigaki, K, Shimomura, M, Shoji, K, Shukla, P, Sickles, A, Silva, CL, Silvermyr, D, Sim, KS, Singh, BK, Singh, CP, Singh, V, Slunečka, M, Soltz, RA, Sondheim, WE, Sorensen, SP, Soumya, M, Sourikova, IV, Stankus, PW, Stenlund, E, Stepanov, M, Ster, A, Stoll, SP, Sugitate, T, Sukhanov, A, Sun, J, Sziklai, J, Takagui, EM, Takahara, A, Taketani, A, Tanaka, Y, Taneja, S, Tanida, K, Tannenbaum, MJ, Tarafdar, S, Taranenko, A, Tennant, E, Themann, H, Todoroki, T, Tomáek, L, Tomáek, M, Torii, H, Towell, RS, Tserruya, I, Tsuchimoto, Y, Tsuji, T, Vale, C, Van Hecke, HW, Vargyas, M, Vazquez-Zambrano, E, Veicht, A, Velkovska, J, Vértesi, R, Virius, M, Vossen, A, Vrba, V, Vznuzdaev, E, Wang, XR, Watanabe, D, Watanabe, K, Watanabe, Y, Watanabe, YS, Wei, F, Wei, R, White, SN, Winter, D, Wolin, S, Woody, CL, Wysocki, M, Yamaguchi, YL, Yang, R, Yanovich, A, Ying, J, Yokkaichi, S, You, Z, Younus, I, Yushmanov, IE, Zajc, WA, Zelenski, A & Zolin, L 2012, 'Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV', Physical Review Letters, vol. 109, no. 15, 152301. https://doi.org/10.1103/PhysRevLett.109.152301
Adare A, Afanasiev S, Aidala C, Ajitanand NN, Akiba Y, Akimoto R et al. Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV. Physical Review Letters. 2012 Oct 9;109(15). 152301. https://doi.org/10.1103/PhysRevLett.109.152301
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. ; Csanád, M. ; Csörgo, 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. ; 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, Byungsik ; 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. ; Král, 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, Sung Keun ; Pate, S. F. ; Patel, L. ; Pei, H. ; Peng, J. C. ; Pereira, H. ; Peresedov, V. ; Peressounko, D. Yu ; 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. ; Slunečka, 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. ; Tomáek, L. ; Tomáek, 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. ; Vértesi, 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. / Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV. In: Physical Review Letters. 2012 ; Vol. 109, No. 15.
@article{e821249bd07d4d398c8507a504921ef2,
title = "Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV",
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 1T<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.",
author = "A. Adare and S. Afanasiev and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and R. Akimoto and H. Al-Ta'Ani and J. Alexander and A. Angerami and K. Aoki and N. Apadula and Y. Aramaki and H. Asano and Aschenauer, {E. C.} and Atomssa, {E. T.} and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and B. Bannier and Barish, {K. N.} and B. Bassalleck and S. Bathe and V. Baublis and S. Baumgart and A. Bazilevsky and R. Belmont and A. Berdnikov and Y. Berdnikov and X. Bing and Blau, {D. S.} and K. Boyle and Brooks, {M. L.} and H. Buesching and V. Bumazhnov and S. Butsyk and S. Campbell and P. Castera and Chen, {C. H.} and Chi, {C. Y.} and M. Chiu and Choi, {I. J.} and Choi, {J. B.} and S. Choi and Choudhury, {R. K.} and P. Christiansen and T. Chujo and O. Chvala and V. Cianciolo and Z. Citron and Cole, {B. A.} and M. Connors and M. Csan{\'a}d and T. Cs{\"o}rgo and S. Dairaku and A. Datta and Daugherity, {M. S.} and G. David and A. Denisov and A. Deshpande and Desmond, {E. J.} and Dharmawardane, {K. V.} and O. Dietzsch and L. Ding and A. Dion and M. Donadelli and O. Drapier and A. Drees and Drees, {K. A.} and Durham, {J. M.} and A. Durum and L. D'Orazio and S. Edwards and Efremenko, {Y. V.} and T. Engelmore and A. Enokizono and S. Esumi and Eyser, {K. O.} and B. Fadem and Fields, {D. E.} and M. Finger and M. Finger and F. Fleuret and Fokin, {S. L.} and Frantz, {J. E.} and A. Franz and Frawley, {A. D.} and Y. Fukao and T. Fusayasu and K. Gainey and C. Gal and A. Garishvili and I. Garishvili and A. Glenn and X. Gong and M. Gonin and Y. Goto and {Granier De Cassagnac}, R. and N. Grau and Greene, {S. V.} and {Grosse Perdekamp}, M. and T. Gunji and L. Guo and Gustafsson, {H. A.} and T. Hachiya and Haggerty, {J. S.} and Hahn, {K. I.} and H. Hamagaki and J. Hanks and K. Hashimoto and E. Haslum and R. Hayano and X. He and Hemmick, {T. K.} and T. Hester and Hill, {J. C.} and Hollis, {R. S.} and K. Homma and Byungsik Hong and T. Horaguchi and Y. Hori and S. Huang and T. Ichihara and H. Iinuma and Y. Ikeda and J. Imrek and M. Inaba and A. Iordanova and D. Isenhower and M. Issah and A. Isupov and D. Ivanischev and Jacak, {B. V.} and M. Javani and J. Jia and X. Jiang and Johnson, {B. M.} and Joo, {K. S.} and D. Jouan and J. Kamin and S. Kaneti and Kang, {B. H.} and Kang, {J. H.} and Kang, {J. S.} and J. Kapustinsky and K. Karatsu and M. Kasai and D. Kawall and Kazantsev, {A. V.} and T. Kempel and A. Khanzadeev and Kijima, {K. M.} and Kim, {B. I.} and C. Kim and Kim, {D. J.} and Kim, {E. J.} and Kim, {H. J.} and Kim, {K. B.} and Kim, {Y. J.} and Kim, {Y. K.} and E. Kinney and A. Kiss and E. Kistenev and J. Klatsky and D. Kleinjan and P. Kline and Y. Komatsu and B. Komkov and J. Koster and D. Kotchetkov and D. Kotov and A. Kr{\'a}l and F. Krizek and Kunde, {G. J.} and K. Kurita and M. Kurosawa and Y. Kwon and Kyle, {G. S.} and R. Lacey and Lai, {Y. S.} and Lajoie, {J. G.} and A. Lebedev and B. Lee and Lee, {D. M.} and J. Lee and Lee, {K. B.} and Lee, {K. S.} and Lee, {S. H.} and Lee, {S. R.} and Leitch, {M. J.} and Leite, {M. A L} and M. Leitgab and B. Lewis and Lim, {S. H.} and {Linden Levy}, {L. A.} and A. Litvinenko and Liu, {M. X.} and B. Love and Maguire, {C. F.} and Makdisi, {Y. I.} and M. Makek and A. Malakhov and A. Manion and Manko, {V. I.} and E. Mannel and S. Masumoto and M. McCumber and McGaughey, {P. L.} and D. McGlinchey and C. McKinney and M. Mendoza and B. Meredith and Y. Miake and T. Mibe and Mignerey, {A. C.} and A. Milov and Mishra, {D. K.} and Mitchell, {J. T.} and Y. Miyachi and S. Miyasaka and Mohanty, {A. K.} and Moon, {H. J.} and Morrison, {D. P.} and S. Motschwiller and Moukhanova, {T. V.} and T. Murakami and J. Murata and T. Nagae and S. Nagamiya and Nagle, {J. L.} and Nagy, {M. I.} and I. Nakagawa and Y. Nakamiya and Nakamura, {K. R.} and T. Nakamura and K. Nakano and C. Nattrass and A. Nederlof and M. Nihashi and R. Nouicer and N. Novitzky and Nyanin, {A. S.} and E. O'Brien and Ogilvie, {C. A.} and K. Okada and A. Oskarsson and M. Ouchida and K. Ozawa and R. Pak and V. Pantuev and V. Papavassiliou and Park, {B. H.} and Park, {I. H.} and Park, {Sung Keun} and Pate, {S. F.} and L. Patel and H. Pei and Peng, {J. C.} and H. Pereira and V. Peresedov and Peressounko, {D. Yu} and R. Petti and C. Pinkenburg and Pisani, {R. P.} and M. Proissl and Purschke, {M. L.} and H. Qu and J. Rak and I. Ravinovich and Read, {K. F.} and R. Reynolds and V. Riabov and Y. Riabov and E. Richardson and D. Roach and G. Roche and Rolnick, {S. D.} and M. Rosati and P. Rukoyatkin and B. Sahlmueller and N. Saito and T. Sakaguchi and V. Samsonov and M. Sano and M. Sarsour and S. Sawada and K. Sedgwick and R. Seidl and A. Sen and R. Seto and D. Sharma and I. Shein and Shibata, {T. A.} and K. Shigaki and M. Shimomura and K. Shoji and P. Shukla and A. Sickles and Silva, {C. L.} and D. Silvermyr and Sim, {K. S.} and Singh, {B. K.} and Singh, {C. P.} and V. Singh and M. Slunečka and Soltz, {R. A.} and Sondheim, {W. E.} and Sorensen, {S. P.} and M. Soumya and Sourikova, {I. V.} and Stankus, {P. W.} and E. Stenlund and M. Stepanov and A. Ster and Stoll, {S. P.} and T. Sugitate and A. Sukhanov and J. Sun and J. Sziklai and Takagui, {E. M.} and A. Takahara and A. Taketani and Y. Tanaka and S. Taneja and K. Tanida and Tannenbaum, {M. J.} and S. Tarafdar and A. Taranenko and E. Tennant and H. Themann and T. Todoroki and L. Tom{\'a}ek and M. Tom{\'a}ek and H. Torii and Towell, {R. S.} and I. Tserruya and Y. Tsuchimoto and T. Tsuji and C. Vale and {Van Hecke}, {H. W.} and M. Vargyas and E. Vazquez-Zambrano and A. Veicht and J. Velkovska and R. V{\'e}rtesi and M. Virius and A. Vossen and V. Vrba and E. Vznuzdaev and Wang, {X. R.} and D. Watanabe and K. Watanabe and Y. Watanabe and Watanabe, {Y. S.} and F. Wei and R. Wei and White, {S. N.} and D. Winter and S. Wolin and Woody, {C. L.} and M. Wysocki and Yamaguchi, {Y. L.} and R. Yang and A. Yanovich and J. Ying and S. Yokkaichi and Z. You and I. Younus and Yushmanov, {I. E.} and Zajc, {W. A.} and A. Zelenski and L. Zolin",
year = "2012",
month = "10",
day = "9",
doi = "10.1103/PhysRevLett.109.152301",
language = "English",
volume = "109",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "15",

}

TY - JOUR

T1 - Evolution of π0 suppression in Au+Au collisions from √s NN=39 to 200 GeV

AU - Adare, A.

AU - Afanasiev, S.

AU - Aidala, C.

AU - Ajitanand, N. N.

AU - Akiba, Y.

AU - Akimoto, R.

AU - Al-Ta'Ani, H.

AU - Alexander, J.

AU - Angerami, A.

AU - Aoki, K.

AU - Apadula, N.

AU - Aramaki, Y.

AU - Asano, H.

AU - Aschenauer, E. C.

AU - Atomssa, E. T.

AU - Awes, T. C.

AU - Azmoun, B.

AU - Babintsev, V.

AU - Bai, M.

AU - Bannier, B.

AU - Barish, K. N.

AU - Bassalleck, B.

AU - Bathe, S.

AU - Baublis, V.

AU - Baumgart, S.

AU - Bazilevsky, A.

AU - Belmont, R.

AU - Berdnikov, A.

AU - Berdnikov, Y.

AU - Bing, X.

AU - Blau, D. S.

AU - Boyle, K.

AU - Brooks, M. L.

AU - Buesching, H.

AU - Bumazhnov, V.

AU - Butsyk, S.

AU - Campbell, S.

AU - Castera, P.

AU - Chen, C. H.

AU - Chi, C. Y.

AU - Chiu, M.

AU - Choi, I. J.

AU - Choi, J. B.

AU - Choi, S.

AU - Choudhury, R. K.

AU - Christiansen, P.

AU - Chujo, T.

AU - Chvala, O.

AU - Cianciolo, V.

AU - Citron, Z.

AU - Cole, B. A.

AU - Connors, M.

AU - Csanád, M.

AU - Csörgo, T.

AU - Dairaku, S.

AU - Datta, A.

AU - Daugherity, M. S.

AU - David, G.

AU - Denisov, A.

AU - Deshpande, A.

AU - Desmond, E. J.

AU - Dharmawardane, K. V.

AU - Dietzsch, O.

AU - Ding, L.

AU - Dion, A.

AU - Donadelli, M.

AU - Drapier, O.

AU - Drees, A.

AU - Drees, K. A.

AU - Durham, J. M.

AU - Durum, A.

AU - D'Orazio, L.

AU - Edwards, S.

AU - Efremenko, Y. V.

AU - Engelmore, T.

AU - Enokizono, A.

AU - Esumi, S.

AU - Eyser, K. O.

AU - Fadem, B.

AU - Fields, D. E.

AU - Finger, M.

AU - Finger, M.

AU - Fleuret, F.

AU - Fokin, S. L.

AU - Frantz, J. E.

AU - Franz, A.

AU - Frawley, A. D.

AU - Fukao, Y.

AU - Fusayasu, T.

AU - Gainey, K.

AU - Gal, C.

AU - Garishvili, A.

AU - Garishvili, I.

AU - Glenn, A.

AU - Gong, X.

AU - Gonin, M.

AU - Goto, Y.

AU - Granier De Cassagnac, R.

AU - Grau, N.

AU - Greene, S. V.

AU - Grosse Perdekamp, M.

AU - Gunji, T.

AU - Guo, L.

AU - Gustafsson, H. A.

AU - Hachiya, T.

AU - Haggerty, J. S.

AU - Hahn, K. I.

AU - Hamagaki, H.

AU - Hanks, J.

AU - Hashimoto, K.

AU - Haslum, E.

AU - Hayano, R.

AU - He, X.

AU - Hemmick, T. K.

AU - Hester, T.

AU - Hill, J. C.

AU - Hollis, R. S.

AU - Homma, K.

AU - Hong, Byungsik

AU - Horaguchi, T.

AU - Hori, Y.

AU - Huang, S.

AU - Ichihara, T.

AU - Iinuma, H.

AU - Ikeda, Y.

AU - Imrek, J.

AU - Inaba, M.

AU - Iordanova, A.

AU - Isenhower, D.

AU - Issah, M.

AU - Isupov, A.

AU - Ivanischev, D.

AU - Jacak, B. V.

AU - Javani, M.

AU - Jia, J.

AU - Jiang, X.

AU - Johnson, B. M.

AU - Joo, K. S.

AU - Jouan, D.

AU - Kamin, J.

AU - Kaneti, S.

AU - Kang, B. H.

AU - Kang, J. H.

AU - Kang, J. S.

AU - Kapustinsky, J.

AU - Karatsu, K.

AU - Kasai, M.

AU - Kawall, D.

AU - Kazantsev, A. V.

AU - Kempel, T.

AU - Khanzadeev, A.

AU - Kijima, K. M.

AU - Kim, B. I.

AU - Kim, C.

AU - Kim, D. J.

AU - Kim, E. J.

AU - Kim, H. J.

AU - Kim, K. B.

AU - Kim, Y. J.

AU - Kim, Y. K.

AU - Kinney, E.

AU - Kiss, A.

AU - Kistenev, E.

AU - Klatsky, J.

AU - Kleinjan, D.

AU - Kline, P.

AU - Komatsu, Y.

AU - Komkov, B.

AU - Koster, J.

AU - Kotchetkov, D.

AU - Kotov, D.

AU - Král, A.

AU - Krizek, F.

AU - Kunde, G. J.

AU - Kurita, K.

AU - Kurosawa, M.

AU - Kwon, Y.

AU - Kyle, G. S.

AU - Lacey, R.

AU - Lai, Y. S.

AU - Lajoie, J. G.

AU - Lebedev, A.

AU - Lee, B.

AU - Lee, D. M.

AU - Lee, J.

AU - Lee, K. B.

AU - Lee, K. S.

AU - Lee, S. H.

AU - Lee, S. R.

AU - Leitch, M. J.

AU - Leite, M. A L

AU - Leitgab, M.

AU - Lewis, B.

AU - Lim, S. H.

AU - Linden Levy, L. A.

AU - Litvinenko, A.

AU - Liu, M. X.

AU - Love, B.

AU - Maguire, C. F.

AU - Makdisi, Y. I.

AU - Makek, M.

AU - Malakhov, A.

AU - Manion, A.

AU - Manko, V. I.

AU - Mannel, E.

AU - Masumoto, S.

AU - McCumber, M.

AU - McGaughey, P. L.

AU - McGlinchey, D.

AU - McKinney, C.

AU - Mendoza, M.

AU - Meredith, B.

AU - Miake, Y.

AU - Mibe, T.

AU - Mignerey, A. C.

AU - Milov, A.

AU - Mishra, D. K.

AU - Mitchell, J. T.

AU - Miyachi, Y.

AU - Miyasaka, S.

AU - Mohanty, A. K.

AU - Moon, H. J.

AU - Morrison, D. P.

AU - Motschwiller, S.

AU - Moukhanova, T. V.

AU - Murakami, T.

AU - Murata, J.

AU - Nagae, T.

AU - Nagamiya, S.

AU - Nagle, J. L.

AU - Nagy, M. I.

AU - Nakagawa, I.

AU - Nakamiya, Y.

AU - Nakamura, K. R.

AU - Nakamura, T.

AU - Nakano, K.

AU - Nattrass, C.

AU - Nederlof, A.

AU - Nihashi, M.

AU - Nouicer, R.

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PY - 2012/10/9

Y1 - 2012/10/9

N2 - 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 1T<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.

AB - 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 1T<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.

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U2 - 10.1103/PhysRevLett.109.152301

DO - 10.1103/PhysRevLett.109.152301

M3 - Article

VL - 109

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 15

M1 - 152301

ER -