/ Experiment-HEP arXiv:0810.0694


The Polarized gluon contribution to the proton spin from the double helicity asymmetry in inclusive pi0 production in polarized p + p collisions at s**(1/2) = 200-GeV


Adare, A. (Colorado U.) ; Afanasiev, S. (Dubna, JINR) ; Aidala, C. (Nevis Labs, Columbia U.) ; Ajitanand, N.N. (SUNY, Stony Brook, Chem. Dept.) ; Akiba, Y. (RIKEN BNL) ; Al-Bataineh, H. (New Mexico State U.) ; Alexander, J. (SUNY, Stony Brook, Chem. Dept.) ; Aoki, K. (Wako, RIKEN) ; Aphecetche, L. (SUBATECH, Nantes) ; Asai, J. (RIKEN BNL) ; Atomssa, E.T. (Ecole Polytechnique) ; Averbeck, R. (SUNY, Stony Brook) ; Awes, T.C. (Oak Ridge) ; Azmoun, B. (Brookhaven) ; Babintsev, V. (Serpukhov, IHEP) ; Bai, M. (Brookhaven) ; Baksay, G. (Florida Inst. Tech.) ; Baksay, L. (Florida Inst. Tech.) ; Baldisseri, A. (DAPNIA, Saclay) ; Barish, K.N. (UC, Riverside) ; Barnes, P.D. (Los Alamos) ; Bassalleck, B. (New Mexico U.) ; Basye, A.T. (Abilene Christian U.) ; Bathe, S. (UC, Riverside) ; Batsouli, S. (Oak Ridge) ; Baublis, V. (St. Petersburg, INP) ; Baumann, C. (Munster U.) ; Bazilevsky, A. (Brookhaven) ; Belikov, S. (Iowa State U.) ; Bennett, R. (SUNY, Stony Brook) ; Berdnikov, A. (St. Petersburg Polytechnic Inst.) ; Berdnikov, Y. (St. Petersburg Polytechnic Inst.) ; Bickley, A.A. (Colorado U.) ; Boissevain, J.G. (Los Alamos) ; Borel, H. (DAPNIA, Saclay) ; Boyle, K. (SUNY, Stony Brook) ; Brooks, M.L. (Los Alamos) ; Buesching, H. (Brookhaven) ; Bumazhnov, V. (Serpukhov, IHEP) ; Bunce, G. (RIKEN BNL) ; Butsyk, S. (SUNY, Stony Brook) ; Camacho, C.M. (Los Alamos) ; Campbell, S. (SUNY, Stony Brook) ; Chand, P. (Bhabha Atomic Res. Ctr.) ; Chang, B.S. (IPAP, Seoul) ; Chang, W.C. (Taiwan, Inst. Phys.) ; Charvet, J.-L. (DAPNIA, Saclay) ; Chernichenko, S. (Serpukhov, IHEP) ; Chi, C.Y. (Nevis Labs, Columbia U.) ; Chiu, M. (Illinois U., Urbana) ; Choi, I.J. (IPAP, Seoul) ; Choudhury, R.K. (Bhabha Atomic Res. Ctr.) ; Chujo, T. (Vanderbilt U.) ; Chung, P. (SUNY, Stony Brook, Chem. Dept.) ; Churyn, A. (Serpukhov, IHEP) ; Cianciolo, V. (Oak Ridge) ; Cole, B.A. (Nevis Labs, Columbia U.) ; Constantin, P. (Los Alamos) ; Csanad, M. (Eotvos U.) ; Csorgo, T. (Budapest, RMKI) ; Dahms, T. (SUNY, Stony Brook) ; Dairaku, S. (Wako, RIKEN) ; Das, K. (Florida State U.) ; David, G. (Brookhaven) ; Denisov, A. (Serpukhov, IHEP) ; d'Enterria, D. (Nevis Labs, Columbia U.) ; Deshpande, A. (SUNY, Stony Brook) ; Desmond, E.J. (Brookhaven) ; Dietzsch, O. (Sao Paulo U.) ; Dion, A. (SUNY, Stony Brook) ; Donadelli, M. (Sao Paulo U.) ; Drapier, O. (Ecole Polytechnique) ; Drees, A. (SUNY, Stony Brook) ; Drees, K.A. (Brookhaven) ; Dubey, A.K. (Weizmann Inst.) ; Durum, A. (Serpukhov, IHEP) ; Dutta, D. (Bhabha Atomic Res. Ctr.) ; Dzhordzhadze, V. (SUBATECH, Nantes) ; Efremenko, Y.V. (Oak Ridge) ; Egdemir, J. (SUNY, Stony Brook) ; Ellinghaus, F. (Colorado U.) ; Engelmore, T. (Nevis Labs, Columbia U.) ; Enokizono, A. (LLNL, Livermore) ; Enyo, H. (RIKEN BNL) ; Esumi, S. (Tsukuba U.) ; Eyser, K.O. (UC, Riverside) ; Fadem, B. (Muhlenberg Coll.) ; Fields, D.E. (RIKEN BNL) ; Finger, M. (Dubna, JINR) ; Finger, M., Jr. (Dubna, JINR) ; Fleuret, F. (Ecole Polytechnique) ; Fokin, S.L. (Kurchatov Inst., Moscow) ; Fraenkel, Z. (Weizmann Inst.) ; Frantz, J.E. (SUNY, Stony Brook) ; Franz, A. (Brookhaven) ; Frawley, Anthony D. (Florida State U.) ; Fujiwara, K. (Wako, RIKEN) ; Fukao, Y. (Wako, RIKEN) ; Fusayasu, T. (Nagasaki Inst. Appl. Sci.) ; Garishvili, I. (SUBATECH, Nantes) ; Glenn, A. (Tennessee U.) ; Gong, H. (SUNY, Stony Brook) ; Gonin, M. (Ecole Polytechnique) ; Gosset, J. (DAPNIA, Saclay) ; Goto, Y. (RIKEN BNL) ; Granier de Cassagnac, R. (Ecole Polytechnique) ; Grau, N. (Iowa State U.) ; Greene, S.V. (Vanderbilt U.) ; Grosse Perdekamp, M. (RIKEN BNL) ; Gunji, T. (Tokyo U., CNS) ; Gustafsson, H.-A. (Lund U.) ; Hadj Henni, A. (SUBATECH, Nantes) ; Haggerty, J.S. (Brookhaven) ; Hamagaki, H. (Tokyo U., CNS) ; Han, R. (Peking U.) ; Hartouni, Edward P. (LLNL, Livermore) ; Haruna, K. (Hiroshima U.) ; Haslum, E. (Lund U.) ; Hayano, R. (Tokyo U., CNS) ; Heffner, M. (LLNL, Livermore) ; Hemmick, T.K. (SUNY, Stony Brook) ; Hester, T. (UC, Riverside) ; He, X. (Georgia State U.) ; Hill, J.C. (Iowa State U.) ; Hohlmann, M. (Florida Inst. Tech.) ; Holzmann, W. (SUNY, Stony Brook, Chem. Dept.) ; Homma, K. (Hiroshima U.) ; Hong, B. (Korea U.) ; Horaguchi, T. (Tokyo Inst. Tech.) ; Hornback, D. (SUBATECH, Nantes) ; Huang, S. (Vanderbilt U.) ; Ichihara, T. (RIKEN BNL) ; Ichimiya, R. (Wako, RIKEN) ; Ikeda, Y. (Tsukuba U.) ; Imai, K. (Wako, RIKEN) ; Imrek, J. (Debrecen U.) ; Inaba, M. (Tsukuba U.) ; Isenhower, D. (Abilene Christian U.) ; Ishihara, M. (Wako, RIKEN) ; Isobe, T. (Tokyo U., CNS) ; Issah, M. (SUNY, Stony Brook, Chem. Dept.) ; Isupov, Alexander (Dubna, JINR) ; Ivanischev, D. (St. Petersburg, INP) ; Jacak, B.V. (SUNY, Stony Brook) ; Jia, J. (Nevis Labs, Columbia U.) ; Jin, J. (Nevis Labs, Columbia U.) ; Johnson, B.M. (Brookhaven) ; Joo, K.S. (Myong Ji U.) ; Jouan, D. (Orsay, IPN) ; Kajihara, F. (Wako, RIKEN) ; Kametani, S. (Waseda U., RISE) ; Kamihara, N. (Tokyo Inst. Tech.) ; Kamin, J. (SUNY, Stony Brook) ; Kang, J.H. (IPAP, Seoul) ; Kapustinsky, J. (Los Alamos) ; Kawall, D. (RIKEN BNL) ; Kazantsev, A.V. (Kurchatov Inst., Moscow) ; Kempel, T. (Iowa State U.) ; Khanzadeev, A. (St. Petersburg, INP) ; Kijima, K. (Hiroshima U.) ; Kikuchi, J. (Waseda U., RISE) ; Kim, B.I. (Korea U.) ; Kim, D.H. (Myong Ji U.) ; Kim, D.J. (IPAP, Seoul) ; Kim, E. (Seoul Natl. U.) ; Kim, S.H. (IPAP, Seoul) ; Kinney, E. (Colorado U.) ; Kiriluk, K. (Colorado U.) ; Kiss, A. (Eotvos U.) ; Kistenev, E. (Brookhaven) ; Klay, J. (LLNL, Livermore) ; Klein-Boesing, Christian (Munster U.) ; Kochenda, L. (St. Petersburg, INP) ; Kochetkov, V. (Serpukhov, IHEP) ; Komkov, B. (St. Petersburg, INP) ; Konno, M. (Tsukuba U.) ; Koster, J. (Illinois U., Urbana) ; Kozlov, A. (Weizmann Inst.) ; Kral, A. (Prague, Tech. U.) ; Kravitz, A. (Nevis Labs, Columbia U.) ; Kunde, G.J. (Los Alamos) ; Kurita, K. (Wako, RIKEN) ; Kurosawa, M. (Wako, RIKEN) ; Kweon, M.J. (Korea U.) ; Kwon, Y. (Tennessee U.) ; Kyle, G.S. (New Mexico State U.) ; Lacey, R. (SUNY, Stony Brook, Chem. Dept.) ; Lai, Y.-S. (Nevis Labs, Columbia U.) ; Lajoie, J.G. (Iowa State U.) ; Layton, D. (Illinois U., Urbana) ; Lebedev, A. (Iowa State U.) ; Lee, D.M. (Los Alamos) ; Lee, K.B. (Korea U.) ; Lee, T. (Seoul Natl. U.) ; Leitch, M.J. (Los Alamos) ; Leite, M.A.L. (Sao Paulo U.) ; Lenzi, B. (Sao Paulo U.) ; Liebing, P. (RIKEN BNL) ; Liska, T. (Prague, Tech. U.) ; Litvinenko, A. (Dubna, JINR) ; Liu, H. (New Mexico State U.) ; Liu, M.X. (Los Alamos) ; Li, X. (Beijing, Inst. Atomic Energy) ; Love, B. (Vanderbilt U.) ; Lynch, D. (Brookhaven) ; Maguire, C.F. (Vanderbilt U.) ; Makdisi, Y.I. (Brookhaven) ; Malakhov, A. (Dubna, JINR) ; Malik, M.D. (New Mexico U.) ; Manko, V.I. (Kurchatov Inst., Moscow) ; Mannel, E. (Nevis Labs, Columbia U.) ; Mao, Y. (Wako, RIKEN) ; Masek, L. (Prague, Inst. Phys.) ; Masui, H. (Tsukuba U.) ; Matathias, F. (Nevis Labs, Columbia U.) ; McCumber, M. (SUNY, Stony Brook) ; McGaughey, P.L. (Los Alamos) ; Meredith, B. (Illinois U., Urbana) ; Miake, Y. (Tsukuba U.) ; Mikes, P. (Prague, Inst. Phys.) ; Miki, K. (Tsukuba U.) ; Milov, A. (SUNY, Stony Brook) ; Mishra, M. (Banaras Hindu U.) ; Mitchell, J.T. (Brookhaven) ; Mohanty, A.K. (Bhabha Atomic Res. Ctr.) ; Morino, Y. (Tokyo U., CNS) ; Morreale, A. (UC, Riverside) ; Morrison, D.P. (Brookhaven) ; Moukhanova, T.V. (Kurchatov Inst., Moscow) ; Mukhopadhyay, D. (Vanderbilt U.) ; Murata, J. (Wako, RIKEN) ; Nagamiya, S. (KEK, Tsukuba) ; Nagle, J.L. (Colorado U.) ; Naglis, M. (Weizmann Inst.) ; Nagy, M. (Eotvos U.) ; Nakagawa, I. (RIKEN BNL) ; Nakamiya, Y. (Hiroshima U.) ; Nakamura, T. (Hiroshima U.) ; Nakano, K. (Tokyo Inst. Tech.) ; Newby, J. (LLNL, Livermore) ; Nguyen, M. (SUNY, Stony Brook) ; Niita, T. (Tsukuba U.) ; Nouicer, R. (Brookhaven) ; Nyanin, A.S. (Kurchatov Inst., Moscow) ; O'Brien, E. (Brookhaven) ; Oda, S.X. (Tokyo U., CNS) ; Ogilvie, C.A. (Iowa State U.) ; Okada, H. (Wako, RIKEN) ; Okada, K. (RIKEN BNL) ; Oka, M. (Tsukuba U.) ; Onuki, Y. (Wako, RIKEN) ; Oskarsson, A. (Lund U.) ; Ouchida, M. (Hiroshima U.) ; Ozawa, K. (Tokyo U., CNS) ; Pak, R. (Brookhaven) ; Palounek, A.P.T. (Los Alamos) ; Pantuev, V. (SUNY, Stony Brook) ; Papavassiliou, V. (New Mexico State U.) ; Park, J. (Seoul Natl. U.) ; Park, W.J. (Korea U.) ; Pate, S.F. (New Mexico State U.) ; Pei, H. (Iowa State U.) ; Peng, J.-C. (Illinois U., Urbana) ; Pereira, H. (DAPNIA, Saclay) ; Peresedov, V. (Dubna, JINR) ; Peressounko, D.Yu. (Kurchatov Inst., Moscow) ; Pinkenburg, C. (Brookhaven) ; Purschke, M.L. (Brookhaven) ; Purwar, A.K. (Los Alamos) ; Qu, H. (Georgia State U.) ; Rak, J. (New Mexico U.) ; Rakotozafindrabe, A. (Ecole Polytechnique) ; Ravinovich, I. (Weizmann Inst.) ; Read, K.F. (Tennessee U.) ; Rembeczki, S. (Florida Inst. Tech.) ; Reuter, M. (SUNY, Stony Brook) ; Reygers, K. (Munster U.) ; Riabov, V. (St. Petersburg, INP) ; Riabov, Y. (St. Petersburg, INP) ; Roach, D. (Vanderbilt U.) ; Roche, G. (Clermont-Ferrand U.) ; Rolnick, S.D. (UC, Riverside) ; Rosati, M. (Iowa State U.) ; Rosendahl, S.S.E. (Lund U.) ; Rosnet, P. (Clermont-Ferrand U.) ; Rukoyatkin, P. (Dubna, JINR) ; Ruzicka, P. (Prague, Inst. Phys.) ; Rykov, V.L. (Wako, RIKEN) ; Sahlmueller, B. (Munster U.) ; Saito, N. (RIKEN BNL) ; Sakaguchi, T. (Brookhaven) ; Sakai, S. (Tsukuba U.) ; Sakashita, K. (Tokyo Inst. Tech.) ; Samsonov, V. (St. Petersburg, INP) ; Sato, T. (Tsukuba U.) ; Sawada, S. (KEK, Tsukuba) ; Sedgwick, K. (UC, Riverside) ; Seele, J. (Colorado U.) ; Seidl, R. (Illinois U., Urbana) ; Semenov, A.Yu. (Iowa State U.) ; Semenov, V. (Serpukhov, IHEP) ; Seto, R. (UC, Riverside) ; Sharma, D. (Weizmann Inst.) ; Shein, I. (Serpukhov, IHEP) ; Shibata, T.-A. (Tokyo Inst. Tech.) ; Shigaki, K. (Hiroshima U.) ; Shimomura, M. (Tsukuba U.) ; Shoji, K. (Wako, RIKEN) ; Shukla, P. (Bhabha Atomic Res. Ctr.) ; Sickles, A. (SUNY, Stony Brook) ; Silva, C.L. (Sao Paulo U.) ; Silvermyr, D. (Oak Ridge) ; Silvestre, C. 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(SUNY, Stony Brook) ; Tomasek, L. (Prague, Inst. Phys.) ; Tomita, Y. (Tsukuba U.) ; Torii, H. (Wako, RIKEN) ; Towell, R.S. (Abilene Christian U.) ; Tram, V-N. (Ecole Polytechnique) ; Tserruya, I. (Weizmann Inst.) ; Tsuchimoto, Y. (Hiroshima U.) ; Vale, C. (Iowa State U.) ; Valle, H. (Vanderbilt U.) ; van Hecke, H.W. (Los Alamos) ; Veicht, A. (Illinois U., Urbana) ; Velkovska, J. (Vanderbilt U.) ; Vertesi, R. (Kossuth Lajos U., Debrecen) ; Vinogradov, A.A. (Kurchatov Inst., Moscow) ; Virius, M. (Prague, Tech. U.) ; Vrba, V. (Prague, Inst. Phys.) ; Vznuzdaev, E. (St. Petersburg, INP) ; Walker, D. (SUNY, Stony Brook) ; Wang, X.R. (New Mexico State U.) ; Watanabe, Y. (RIKEN BNL) ; Wei, F. (Iowa State U.) ; Wessels, J. (Munster U.) ; White, S.N. (Brookhaven) ; Williamson, S. (Illinois U., Urbana) ; Winter, D. (Nevis Labs, Columbia U.) ; Woody, C.L. (Brookhaven) ; Wysocki, M. (Colorado U.) ; Xie, W. (RIKEN BNL) ; Yamaguchi, Y.L. (Waseda U., RISE) ; Yamaura, K. (Hiroshima U.) ; Yang, R. (Illinois U., Urbana) ; Yanovich, A. (Serpukhov, IHEP) ; Ying, J. (Georgia State U.) ; Yokkaichi, S. (RIKEN BNL) ; Young, G.R. (Oak Ridge) ; Younus, I. (New Mexico U.) ; Yushmanov, I.E. (Kurchatov Inst., Moscow) ; Zajc, W.A. (Nevis Labs, Columbia U.) ; Zaudtke, O. (Munster U.) ; Zhang, C. (Oak Ridge) ; Zhou, S. (Beijing, Inst. Atomic Energy) ; Zolin, L. (Dubna, JINR)

Published in: Phys.Rev.Lett.
Year: 2009
Vol.: 103
Page No: 012003
Pages: 6

Abstract: The double helicity asymmetry in neutral pion production for p_T = 1 to 12 GeV/c has been measured with the PHENIX experiment in order to access the gluon spin contribution, Delta-G, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of \mu^2 = 4 GeV^2 give Delta-G^[0.02,0.3] = 0.1 to 0.2, with a constraint of -0.7 < Delta-G^[0.02,0.3] < 0.5 at Delta-chi^2 = 9 (~3 sigma) for our sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for our measured asymmetries generated from four representative fits to polarized deep inelastic scattering data. We also consider the dependence of the Delta-G constraint on the choice of theoretical scale, a dominant uncertainty in these predictions.

Web-Page: http://inspirebeta.net/record/798465/files/data.png; http://inspirebeta.net/record/798465/files/dgflip.png; http://inspirebeta.net/record/798465/files/model.png; http://inspirebeta.net/record/798465/files/scale.png

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