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Gluon-Spin Contribution to the Proton Spin from the Double-Helicity Asymmetry in Inclusive pi(0) Production in Polarized p plus p Collisions at root s=200 GeV

Adare, A.; Afanasiev, S.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Al-Bataineh, H.; Alexander, J.; Aoki, K.; Aphecetche, L. and Asai, J., et al. (2009) In Physical Review Letters 103(1).
Abstract
The double helicity asymmetry in neutral pion production for p(T) = 1 to 12 GeV/c was measured with the PHENIX experiment 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 GeV2 a next to leading order QCD analysis gives Delta G([0.02,0.3]) = 0.2, with a constraint of -0.7 < Delta G([0.02,0.3]) < 0.5 at Delta chi(2) = 9 (similar to 3 sigma) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the 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 the... (More)
The double helicity asymmetry in neutral pion production for p(T) = 1 to 12 GeV/c was measured with the PHENIX experiment 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 GeV2 a next to leading order QCD analysis gives Delta G([0.02,0.3]) = 0.2, with a constraint of -0.7 < Delta G([0.02,0.3]) < 0.5 at Delta chi(2) = 9 (similar to 3 sigma) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the 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 the theoretical scale, a dominant uncertainty in these predictions. (Less)
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Physical Review Letters
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103
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1
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American Physical Society
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1079-7114
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10.1103/PhysRevLett.103.012003
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English
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@article{0647d7b5-a7c9-4bef-8e13-0f60a1dcc813,
  abstract     = {The double helicity asymmetry in neutral pion production for p(T) = 1 to 12 GeV/c was measured with the PHENIX experiment 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 GeV2 a next to leading order QCD analysis gives Delta G([0.02,0.3]) = 0.2, with a constraint of -0.7 &lt; Delta G([0.02,0.3]) &lt; 0.5 at Delta chi(2) = 9 (similar to 3 sigma) for the sampled gluon momentum fraction (x) range, 0.02 to 0.3. The results are obtained using predictions for the 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 the theoretical scale, a dominant uncertainty in these predictions.},
  author       = {Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Al-Bataineh, H. and Alexander, J. and Aoki, K. and Aphecetche, L. and Asai, J. and Atomssa, E. T. and Averbeck, R. and Awes, T. C. and Azmoun, B. and Babintsev, V. and Bai, M. and Baksay, G. and Baksay, L. and Baldisseri, A. and Barish, K. N. and Barnes, P. D. and Bassalleck, B. and Basye, A. T. and Bathe, S. and Batsouli, S. and Baublis, V. and Baumann, C. and Bazilevsky, A. and Belikov, S. and Bennett, R. and Berdnikov, A. and Berdnikov, Y. and Bickley, A. A. and Boissevain, J. G. and Borel, H. and Boyle, K. and Brooks, M. L. and Buesching, H. and Bumazhnov, V. and Bunce, G. and Butsyk, S. and Camacho, C. M. and Campbell, S. and Chand, P. and Chang, B. S. and Chang, W. C. and Charvet, J. -L. and Chernichenko, S. and Chi, C. Y. and Chiu, M. and Choi, I. J. and Choudhury, R. K. and Chujo, T. and Chung, P. and Churyn, A. and Cianciolo, V. and Citron, Z. and Cole, B. A. and Constantin, P. and Csanad, M. and Csoergo, T. and Dahms, T. and Dairaku, S. and Das, K. and David, G. and Denisov, A. and d'Enterria, D. and Deshpande, A. and Desmond, E. J. and Dietzsch, O. and Dion, A. and Donadelli, M. and Drapier, O. and Drees, A. and Drees, K. A. and Dubey, A. K. and Durum, A. and Dutta, D. and Dzhordzhadze, V. and Efremenko, Y. V. and Egdemir, J. and Ellinghaus, F. and Engelmore, T. and Enokizono, A. and En'yo, H. and Esumi, S. and Eyser, K. O. and Fadem, B. and Fields, D. E. and Finger, M. and Finger, M., Jr. and Fleuret, F. and Fokin, S. L. and Fraenkel, Z. and Frantz, J. E. and Franz, A. and Frawley, A. D. and Fujiwara, K. and Fukao, Y. and Fusayasu, T. and Garishvili, I. and Glenn, A. and Gong, H. and Gonin, M. and Gosset, J. and Goto, Y. and de Cassagnac, R. Granier and Grau, N. and Greene, S. V. and Perdekamp, M. Grosse and Gunji, T. and Gustafsson, Hans-Åke and Henni, A. Hadj and Haggerty, J. S. and Hamagaki, H. and Han, R. and Hartouni, E. P. and Haruna, K. and Haslum, Eva and Hayano, R. and Heffner, M. and Hemmick, T. K. and Hester, T. and He, X. and Hill, J. C. and Hohlmann, M. and Holzmann, W. and Homma, K. and Hong, B. and Horaguchi, T. and Hornback, D. and Huang, S. and Ichihara, T. and Ichimiya, R. and Ikeda, Y. and Imai, K. and Imrek, J. and Inaba, M. and Isenhower, D. and Ishihara, M. and Isobe, T. and Issah, M. and Isupov, A. and Ivanischev, D. and Jacak, B. V. and Jia, J. and Jin, J. and Johnson, B. M. and Joo, K. S. and Jouan, D. and Kajihara, F. and Kametani, S. and Kamihara, N. and Kamin, J. and Kang, J. H. and Kapustinsky, J. and Kawall, D. and Kazantsev, A. V. and Kempel, T. and Khanzadeev, A. and Kijima, K. M. and Kikuchi, J. and Kim, B. I. and Kim, D. H. and Kim, D. J. and Kim, E. and Kim, S. H. and Kinney, E. and Kiriluk, K. and Kiss, A. and Kistenev, E. and Klay, J. and Klein-Boesing, C. and Kochenda, L. and Kochetkov, V. and Komkov, B. and Konno, M. and Koster, J. and Kozlov, A. and Kral, A. and Kravitz, A. and Kunde, G. J. and Kurita, K. and Kurosawa, M. and Kweon, M. J. and Kwon, Y. and Kyle, G. S. and Lacey, R. and Lai, Y. S. and Lajoie, J. G. and Layton, D. and Lebedev, A. and Lee, D. M. and Lee, K. B. and Lee, T. and Leitch, M. J. and Leite, M. A. L. and Lenzi, B. and Liebing, P. and Liska, T. and Litvinenko, A. and Liu, H. and Liu, M. X. and Li, X. and Love, B. and Lynch, D. and Maguire, C. F. and Makdisi, Y. I. and Malakhov, A. and Malik, M. D. and Manko, V. I. and Mannel, E. and Mao, Y. and Masek, L. and Masui, H. and Matathias, F. and McCumber, M. and McGaughey, P. L. and Means, N. and Meredith, B. and Miake, Y. and Mikes, P. and Miki, K. and Milov, A. and Mishra, M. and Mitchell, J. T. and Mohanty, A. K. and Morino, Y. and Morreale, A. and Morrison, D. P. and Moukhanova, T. V. and Mukhopadhyay, D. and Murata, J. and Nagamiya, S. and Nagle, J. L. and Naglis, M. and Nagy, M. I. and Nakagawa, I. and Nakamiya, Y. and Nakamura, T. and Nakano, K. and Newby, J. and Nguyen, M. and Niita, T. and Nouicer, R. and Nyanin, A. S. and O'Brien, E. and Oda, S. X. and Ogilvie, C. A. and Okada, H. and Okada, K. and Oka, M. and Onuki, Y. and Oskarsson, Anders and Ouchida, M. and Ozawa, K. and Pak, R. and Palounek, A. P. T. and Pantuev, V. and Papavassiliou, V. and Park, J. and Park, W. J. and Pate, S. F. and Pei, H. and Peng, J. -C. and Pereira, H. and Peresedov, V. and Peressounko, D. Yu. and Pinkenburg, C. and Purschke, M. L. and Purwar, A. K. and Qu, H. and Rak, J. and Rakotozafindrabe, A. and Ravinovich, I. and Read, K. F. and Rembeczki, S. and Reuter, M. and Reygers, K. and Riabov, V. and Riabov, Y. and Roach, D. and Roche, G. and Rolnick, S. D. and Rosati, M. and Rosendahl, Sarah and Rosnet, P. and Rukoyatkin, P. and Ruzicka, P. and Rykov, V. L. and Sahlmueller, B. and Saito, N. and Sakaguchi, T. and Sakai, S. and Sakashita, K. and Samsonov, V. and Sato, T. and Sawada, S. and Sedgwick, K. and Seele, J. and Seidl, R. and Semenov, A. Yu. and Semenov, V. and Seto, R. and Sharma, D. and Shein, I. and Shibata, T. -A. and Shigaki, K. and Shimomura, M. and Shoji, K. and Shukla, P. and Sickles, A. and Silva, C. L. and Silvermyr, D. and Silvestre, C. and Sim, K. S. and Singh, B. K. and Singh, C. P. and Singh, V. and Slunecka, M. and Soldatov, A. and Soltz, R. A. and Sondheim, W. E. and Sorensen, S. P. and Sourikova, I. V. and Staley, F. and Stankus, P. W. and Stenlund, Evert and Stepanov, M. and Ster, A. and Stoll, S. P. and Sugitate, T. and Suire, C. and Sukhanov, A. and Sziklai, J. and Takagui, E. M. and Taketani, A. and Tanabe, R. and Tanaka, Y. and Taneja, S. and Tanida, K. and Tannenbaum, M. J. and Taranenko, A. and Tarjan, P. and Themann, H. and Thomas, T. L. and Togawa, M. and Toia, A. and Tomasek, L. and Tomita, Y. and Torii, H. and Towell, R. S. and Tram, V-N. and Tserruya, I. and Tsuchimoto, Y. and Vale, C. and Valle, H. and van Hecke, H. W. and Veicht, A. and Velkovska, J. and Vertesi, R. and Vinogradov, A. A. and Virius, M. and Vrba, V. and Vznuzdaev, E. and Walker, D. and Wang, X. R. and Watanabe, Y. and Wei, F. and Wessels, J. and White, S. N. and Williamson, S. and Winter, D. and Woody, C. L. and Wysocki, M. and Xie, W. and Yamaguchi, Y. L. and Yamaura, K. and Yang, R. and Yanovich, A. and Ying, J. and Yokkaichi, S. and Young, G. R. and Younus, I. and Yushmanov, I. E. and Zajc, W. A. and Zaudtke, O. and Zhang, C. and Zhou, S. and Zolin, L.},
  issn         = {1079-7114},
  language     = {eng},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Gluon-Spin Contribution to the Proton Spin from the Double-Helicity Asymmetry in Inclusive pi(0) Production in Polarized p plus p Collisions at root s=200 GeV},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.103.012003},
  volume       = {103},
  year         = {2009},
}