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Gluon-Spin contribution to the proton spin from the double-helicity asymmetry in inclusive π0 production in polarized p+p collisions at s=200GeV

  • A. Adare
  • , S. Afanasiev
  • , C. Aidala
  • , N. N. Ajitanand
  • , Y. Akiba
  • , H. Al-Bataineh
  • , J. Alexander
  • , K. Aoki
  • , L. Aphecetche
  • , 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. Bennett, A. Berdnikov, Y. Berdnikov, A. A. Bickley, J. G. Boissevain, H. Borel, K. Boyle, M. L. Brooks, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, C. M. Camacho, S. Campbell, P. Chand, B. S. Chang, W. C. Chang, J. L. Charvet, S. Chernichenko, C. Y. Chi, M. Chiu, I. J. Choi, R. K. Choudhury, T. Chujo, P. Chung, A. Churyn, V. Cianciolo, Z. Citron, B. A. Cole, P. Constantin, M. Csanád, T. Csörgo, T. Dahms, S. Dairaku, K. Das, 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, A. Durum, D. Dutta, V. Dzhordzhadze, Y. V. Efremenko, J. Egdemir, 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. Å Gustafsson, A. Hadj Henni, J. S. Haggerty, H. Hamagaki, R. Han, E. P. Hartouni, K. Haruna, E. Haslum, R. Hayano, M. Heffner, 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, 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, F. Kajihara, S. Kametani, N. Kamihara, J. Kamin, J. H. Kang, J. Kapustinsky, D. Kawall, A. V. Kazantsev, T. Kempel, A. Khanzadeev, K. M. Kijima, J. Kikuchi, B. I. Kim, D. H. Kim, D. J. Kim, E. Kim, S. H. Kim, E. Kinney, K. Kiriluk, A. Kiss, E. Kistenev, J. Klay, C. Klein-Boesing, L. Kochenda, V. Kochetkov, B. Komkov, M. Konno, J. Koster, 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, K. B. Lee, T. Lee, M. J. Leitch, M. A.L. Leite, B. Lenzi, P. Liebing, T. Liška, A. Litvinenko, H. Liu, M. X. Liu, X. Li, B. Love, D. Lynch, C. F. Maguire, Y. I. Makdisi, A. Malakhov, M. D. Malik, V. I. Manko, E. Mannel, Y. Mao, L. Mašek, H. Masui, F. Matathias, M. McCumber, P. L. McGaughey, N. Means, B. Meredith, Y. Miake, P. Mikeš, 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, H. Okada, K. Okada, M. Oka, Y. Onuki, A. Oskarsson, M. Ouchida, K. Ozawa, R. Pak, A. P.T. Palounek, V. Pantuev, V. Papavassiliou, J. Park, W. J. Park, S. F. Pate, H. Pei, J. C. Peng, H. Pereira, V. Peresedov, D. Yu Peressounko, C. Pinkenburg, M. L. Purschke, A. K. Purwar, H. Qu, J. Rak, A. Rakotozafindrabe, I. Ravinovich, K. F. Read, S. Rembeczki, M. Reuter, K. Reygers, V. Riabov, Y. Riabov, D. Roach, G. Roche, S. D. Rolnick, M. Rosati, S. S.E. Rosendahl, P. Rosnet, P. Rukoyatkin, P. Ružička, V. L. Rykov, B. Sahlmueller, N. Saito, T. Sakaguchi, S. Sakai, K. Sakashita, V. Samsonov, 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. Slunečka, A. Soldatov, R. A. Soltz, W. E. Sondheim, S. P. Sorensen, I. V. Sourikova, 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, S. Taneja, K. Tanida, M. J. Tannenbaum, A. Taranenko, P. Tarján, H. Themann, T. L. Thomas, M. Togawa, A. Toia, L. Tomášek, Y. Tomita, H. Torii, R. S. Towell, V. N. Tram, I. Tserruya, Y. Tsuchimoto, C. Vale, H. Valle, H. W. Van Hecke, A. Veicht, J. Velkovska, R. Vertesi, A. A. Vinogradov, M. Virius, V. Vrba, E. Vznuzdaev, D. Walker, X. R. Wang, Y. Watanabe, F. Wei, J. Wessels, S. N. White, S. Williamson, D. Winter, C. L. Woody, M. Wysocki, W. Xie, Y. L. Yamaguchi, K. Yamaura, R. Yang, A. Yanovich, J. Ying, S. Yokkaichi, G. R. Young, I. Younus, I. E. Yushmanov, W. A. Zajc, O. Zaudtke, C. Zhang, S. Zhou, L. Zolin
  • University of Colorado Boulder
  • Joint Institute for Nuclear Research, Dubna
  • UMass Amherst
  • Stony Brook University
  • RIKEN Nishina Center for Accelerator-Based Science
  • Riken BNL Research Center
  • New Mexico State University
  • Kyoto University
  • Université de Nantes
  • Ip Paris
  • Oak Ridge National Laboratory
  • Brookhaven National Laboratory
  • Kurchatov Institute
  • Florida Institute of Technology
  • Institut Pierre Simon Laplace, CNRS and CEA
  • University of California, Riverside
  • MST-8, Los Alamos National Laboratory
  • University of New Mexico
  • Abilene Christian University
  • Petersburg Nuclear Physics Institute (PNPI)
  • University of Münster
  • St. Petersburg State Polytechnical University
  • Bhabha Atomic Research Centre
  • Yonsei University
  • Academia Sinica, Institute Of Physics
  • Columbia University
  • University of Illinois at Urbana-Champaign
  • University of Tsukuba
  • Eötvös Loránd University
  • Wigner Research Centre for Physics
  • Florida State University
  • University of São Paulo
  • Weizmann Institute of Science Israel
  • Lawrence Livermore National Laboratory
  • Muhlenberg College
  • Charles University
  • Kurchatov Institute
  • Nagasaki Institute of Applied Science
  • University of Tennessee
  • Vanderbilt University
  • University of Tokyo
  • Lund University
  • Tsinghua University
  • Hiroshima University
  • Georgia State University
  • Iowa State University
  • Korea University
  • Tokyo Institute of Technology
  • University of Debrecen
  • Myongji University
  • Université Paris-Saclay
  • Waseda University
  • Seoul National University
  • Czech Technical University in Prague
  • Rikkyo University
  • China Institute of Atomic Energy
  • Institute of Physics of the Czech Academy of Sciences
  • Banaras Hindu University
  • High Energy Accelerator Research Organization (KEK)
  • Université Blaise Pascal

Research output: Contribution to journalArticlepeer-review

Abstract

The double helicity asymmetry in neutral pion production for pT=1 to 12GeV/c was measured with the PHENIX experiment to access the gluon-spin contribution, ΔG, to the proton spin. Measured asymmetries are consistent with zero, and at a theory scale of μ2=4GeV2 a next to leading order QCD analysis gives ΔG[0.02,0.3]=0.2, with a constraint of -0.7<ΔG[0. 02,0.3]<0.5 at Δχ2=9 (∼3σ) 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 ΔG constraint on the choice of the theoretical scale, a dominant uncertainty in these predictions.

Original languageEnglish
Article number012003
JournalPhysical Review Letters
Volume103
Issue number1
DOIs
Publication statusPublished - 6 Aug 2009

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