Gluon-Spin Contribution to the Proton Spin from the Double-Helicity Asymmetry in Inclusive ⁰ Production in Polarized p+p Collisions at =200 GeV

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(PHENIX Collaboration)

¹Abilene Christian University, Abilene, Texas 79699, USA
²Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
³Department of Physics, Banaras Hindu University, Varanasi 221005, India
⁴Bhabha Atomic Research Centre, Bombay 400 085, India
⁵Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁶Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁷Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁸University of California - Riverside, Riverside, California 92521, USA
⁹Charles University, Ovocný trh 5, Praha 1, 116 36, Prague, Czech Republic
¹⁰China Institute of Atomic Energy (CIAE), Beijing, People's Republic of China
¹¹Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
¹²University of Colorado, Boulder, Colorado 80309, USA
¹³Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA
¹⁴Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic
¹⁵Dapnia, CEA Saclay, F-91191, Gif-sur-Yvette, France
¹⁶Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary
¹⁷ELTE, Eötvös Loránd University, H - 1117 Budapest, Pázmány P. s. 1/A, Hungary
¹⁸Florida Institute of Technology, Melbourne, Florida 32901, USA
¹⁹Florida State University, Tallahassee, Florida 32306, USA
²⁰Georgia State University, Atlanta, Georgia 30303, USA
²¹Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
²²IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, Russia
²³University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
²⁴Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
²⁵Iowa State University, Ames, Iowa 50011, USA
²⁶Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
²⁷KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
²⁸KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), H-1525 Budapest 114, POBox 49, Budapest, Hungary
²⁹Korea University, Seoul, 136-701, Korea
³⁰Russian Research Center “Kurchatov Institute”, Moscow, Russia
³¹Kyoto University, Kyoto 606-8502, Japan
³²Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, France
³³Lawrence Livermore National Laboratory, Livermore, California 94550, USA
³⁴Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
³⁵LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France
³⁶Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
³⁷Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA
³⁸Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
³⁹Muhlenberg College, Allentown, Pennsylvania 18104-5586, USA
⁴⁰Myongji University, Yongin, Kyonggido 449-728, Korea
⁴¹Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
⁴²University of New Mexico, Albuquerque, New Mexico 87131, USA
⁴³New Mexico State University, Las Cruces, New Mexico 88003, USA
⁴⁴Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁴⁵IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, France
⁴⁶Peking University, Beijing, People's Republic of China
⁴⁷PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, 188300, Russia
⁴⁸RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, JAPAN
⁴⁹RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
⁵⁰Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
⁵¹Saint Petersburg State Polytechnic University, Saint Petersburg, Russia
⁵²Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
⁵³System Electronics Laboratory, Seoul National University, Seoul, Korea
⁵⁴Chemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USA
⁵⁵Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA.
⁵⁶SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722 - 44307, Nantes, France
⁵⁷University of Tennessee, Knoxville, Tennessee 37996, USA
⁵⁸Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
⁵⁹Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
⁶⁰Vanderbilt University, Nashville, Tennessee 37235, USA
⁶¹Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
⁶²Weizmann Institute, Rehovot 76100, Israel
⁶³Yonsei University, IPAP, Seoul 120-749, Korea

Received 6 October 2008; published 1 July 2009

Thedouble helicity asymmetry in neutral pion production for p_T=1 to12 GeV/c was measured with the PHENIX experiment to access thegluon-spin contribution, Delta G, to the proton spin. Measured asymmetries areconsistent with zero, and at a theory scale of µ²=4 GeV²a next to leading order QCD analysis gives Delta G^[0.02,0.3]=0.2, witha constraint of -0.7< Delta G^[0.02,0.3]<0.5 at Delta chi ²=9 (~3 sigma ) for the sampledgluon momentum fraction (x) range, 0.02 to 0.3. The resultsare obtained using predictions for the measured asymmetries generated fromfour representative fits to polarized deep inelastic scattering data. Wealso consider the dependence of the Delta G constraint on thechoice of the theoretical scale, a dominant uncertainty in thesepredictions.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.103.012003
DOI:	10.1103/PhysRevLett.103.012003
PACS:	13.88.+e; 13.85.Ni; 21.10.Hw; 25.40.Ep 13.88.+e Polarization in elementary particle interactions and scattering 13.85.Ni Hadron-induced inclusive production with identified hadrons (energy>10 GeV) 21.10.Hw Nuclear spin, parity, and isobaric spin 25.40.Ep Nuclear inelastic proton scattering YEAR: 2009

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Phys. Rev. Lett. 103, 012003 (2009) [6 pages]

Gluon-Spin Contribution to the Proton Spin from the Double-Helicity Asymmetry in Inclusive 0 Production in Polarized p+p Collisions at =200 GeV

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Gluon-Spin Contribution to the Proton Spin from the Double-Helicity Asymmetry in Inclusive ⁰ Production in Polarized p+p Collisions at =200 GeV