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Phys Rev Lett. 2010 Jun 25;104(25):252301. doi: 10.1103/PhysRevLett.104.252301. Epub 2010 Jun 21.

Transition in yield and azimuthal shape modification in dihadron correlations in relativistic heavy ion collisions.

Physical review letters

A Adare, S Afanasiev, C Aidala, N N Ajitanand, Y Akiba, H Al-Bataineh, J Alexander, K Aoki, L Aphecetche, Y Aramaki, 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 Belmont, R Bennett, A Berdnikov, Y Berdnikov, A A Bickley, J G Boissevain, J S Bok, 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, C-H Chen, S Chernichenko, C Y Chi, M Chiu, I J Choi, R K Choudhury, P Christiansen, T Chujo, P Chung, A Churyn, O Chvala, V Cianciolo, Z Citron, B A Cole, M Connors, P Constantin, M Csanád, T Csörgo, T Dahms, S Dairaku, I Danchev, K Das, A Datta, G David, 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, J M Durham, A Durum, D Dutta, V Dzhordzhadze, S Edwards, Y V Efremenko, F Ellinghaus, T Engelmore, A Enokizono, H En'yo, S Esumi, K O Eyser, B Fadem, D E Fields, M Finger, M Finger, F Fleuret, S L Fokin, Z Fraenkel, J E Frantz, A Franz, A D Frawley, K Fujiwara, Y Fukao, T Fusayasu, 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, A Hadj Henni, J S Haggerty, K I Hahn, H Hamagaki, J Hamblen, J Hanks, R Han, E P Hartouni, K Haruna, E Haslum, R Hayano, M Heffner, S Hegyi, T K Hemmick, T Hester, X He, J C Hill, M Hohlmann, W Holzmann, K Homma, B Hong, T Horaguchi, D Hornback, S Huang, T Ichihara, R Ichimiya, J Ide, H Iinuma, Y Ikeda, K Imai, J Imrek, M Inaba, D Isenhower, M Ishihara, T Isobe, M Issah, A Isupov, D Ivanischev, B V Jacak, J Jia, J Jin, B M Johnson, K S Joo, D Jouan, D S Jumper, F Kajihara, S Kametani, N Kamihara, J Kamin, J H Kang, J Kapustinsky, D Kawall, M Kawashima, A V Kazantsev, T Kempel, A Khanzadeev, K M Kijima, J Kikuchi, B I Kim, D H Kim, D J Kim, E J Kim, E Kim, S H Kim, Y J Kim, E Kinney, K Kiriluk, A Kiss, E Kistenev, J Klay, C Klein-Boesing, L Kochenda, B Komkov, M Konno, J Koster, D Kotchetkov, A Kozlov, A Král, A Kravitz, G J Kunde, K Kurita, M Kurosawa, M J Kweon, Y Kwon, G S Kyle, R Lacey, Y S Lai, J G Lajoie, D Layton, A Lebedev, D M Lee, J Lee, K B Lee, K Lee, K S Lee, T Lee, M J Leitch, M A L Leite, E Leitner, B Lenzi, P Liebing, L A Linden Levy, T Liska, A Litvinenko, H Liu, M X Liu, X Li, B Love, R Luechtenborg, 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, A C Mignerey, P Mikes, K Miki, A Milov, M Mishra, J T Mitchell, A K Mohanty, Y Morino, A Morreale, D P Morrison, T V Moukhanova, D Mukhopadhyay, J Murata, S Nagamiya, J L Nagle, M Naglis, M I Nagy, I Nakagawa, Y Nakamiya, T Nakamura, K Nakano, J Newby, M Nguyen, T Niita, R Nouicer, A S Nyanin, E O'Brien, S X Oda, C A Ogilvie, K Okada, M Oka, Y Onuki, A Oskarsson, M Ouchida, K Ozawa, R Pak, A P T Palounek, V Pantuev, V Papavassiliou, I H Park, J Park, S K Park, W J Park, S F Pate, H Pei, J-C Peng, H Pereira, V Peresedov, D Yu Peressounko, C Pinkenburg, R P Pisani, M Proissl, M L Purschke, A K Purwar, H Qu, J Rak, A Rakotozafindrabe, I Ravinovich, K F Read, S Rembeczki, K Reygers, V Riabov, Y Riabov, E Richardson, D Roach, G Roche, S D Rolnick, M Rosati, C A Rosen, S S E Rosendahl, P Rosnet, P Rukoyatkin, P Ruzicka, V L Rykov, B Sahlmueller, N Saito, T Sakaguchi, S Sakai, K Sakashita, V Samsonov, S Sano, T Sato, S Sawada, K Sedgwick, J Seele, R Seidl, A Yu Semenov, V Semenov, R Seto, D Sharma, I Shein, 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, M Slunecka, A Soldatov, R A Soltz, W E Sondheim, S P Sorensen, I V Sourikova, N A Sparks, F Staley, P W Stankus, E Stenlund, M Stepanov, A Ster, S P Stoll, T Sugitate, C Suire, A Sukhanov, J Sziklai, E M Takagui, A Taketani, R Tanabe, Y Tanaka, K Tanida, M J Tannenbaum, S Tarafdar, A Taranenko, P Tarján, H Themann, T L Thomas, M Togawa, A Toia, L Tomásek, Y Tomita, H Torii, R S Towell, V-N Tram, I Tserruya, Y Tsuchimoto, C Vale, H Valle, H W van Hecke, E Vazquez-Zambrano, A Veicht, J Velkovska, R Vértesi, A A Vinogradov, M Virius, V Vrba, E Vznuzdaev, X R Wang, D Watanabe, K Watanabe, Y Watanabe, F Wei, R Wei, J Wessels, S N White, D Winter, J P Wood, C L Woody, R M Wright, M Wysocki, W Xie, Y L Yamaguchi, K Yamaura, R Yang, A Yanovich, J Ying, S Yokkaichi, G R Young, I Younus, Z You, I E Yushmanov, W A Zajc, O Zaudtke, C Zhang, S Zhou, L Zolin,

Affiliations

  1. University of Colorado, Boulder, Colorado 80309, USA.

PMID: 20867367 DOI: 10.1103/PhysRevLett.104.252301

Abstract

Hard-scattered parton probes produced in collisions of large nuclei indicate large partonic energy loss, possibly with collective produced-medium response to the lost energy. We present measurements of π^{0} trigger particles at transverse momenta p{T}{t}=4-12  GeV/c and associated charged hadrons (p{T}{a}=0.5-7  GeV/c) vs relative azimuthal angle Δϕ in Au+Au and p+p collisions at sqrt[s{NN}]=200  GeV. The Au+Au distribution at low p{T}{a}, whose shape has been interpreted as a medium effect, is modified for p{T}{t}<7  GeV/c. At higher p{T}{t}, the data are consistent with unmodified or very weakly modified shapes, even for the lowest measured p{T}{a}, which quantitatively challenges some medium response models. The associated yield of hadrons opposing the trigger particle in Au+Au relative to p+p (I{AA}) is suppressed at high p{T} (I{AA}≈0.35-0.5), but less than for inclusive suppression (R{AA}≈0.2).

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