Phys. Rev. D
73,
091102(R)
(2006)
[5 pages]
Improved measurement of double helicity asymmetry in inclulsive midrapidity π0 production for polarized p+p collisions at √s=200 GeV
S. S. Adler et al. PHENIX Collaboration
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S. S. Adler5, S. Afanasiev20, C. Aidala10, N. N. Ajitanand47, Y. Akiba22,41,42, A. Al-Jamel36, J. Alexander47, K. Aoki26,41, L. Aphecetche49, R. Armendariz36, S. H. Aronson5, R. Averbeck48, T. C. Awes37, B. Azmoun5, V. Babintsev17, A. Baldisseri11, K. N. Barish6, P. D. Barnes29, B. Bassalleck35, S. Bathe6,32, S. Batsouli10, V. Baublis40, F. Bauer6, A. Bazilevsky5,42, S. Belikov5,17,19, R. Bennett48, Y. Berdnikov44, M. T. Bjorndal10, J. G. Boissevain29, H. Borel11, K. Boyle48, M. L. Brooks29, D. S. Brown36, N. Bruner35, D. Bucher32, H. Buesching5,32, V. Bumazhnov17, G. Bunce5,42, J. M. Burward-Hoy28,29, S. Butsyk48, X. Camard49, S. Campbell48, J.-S. Chai21, P. Chand4, W. C. Chang2, S. Chernichenko17, C. Y. Chi10, J. Chiba22, M. Chiu10, I. J. Choi56, R. K. Choudhury4, T. Chujo5,53, V. Cianciolo37, C. R. Cleven15, Y. Cobigo11, B. A. Cole10, M. P. Comets38, P. Constantin19, M. Csanád13, T. Csörgő23, J. P. Cussonneau49, D. d’Enterria10, T. Dahms48, K. Das14, G. David5, F. Deák13, H. Delagrange49, A. Denisov17, A. Deshpande42,48, E. J. Desmond5, A. Devismes48, O. Dietzsch45, A. Dion48, J. L. Drachenberg1, O. Drapier27, A. Drees48, A. K. Dubey55, A. Durum17, D. Dutta4, V. Dzhordzhadze50, Y. V. Efremenko37, J. Egdemir48, A. Enokizono16, H. En’yo41,42, B. Espagnon38, S. Esumi52, D. E. Fields35,42, C. Finck49, F. Fleuret27, S. L. Fokin25, B. Forestier30, B. D. Fox42, Z. Fraenkel55, J. E. Frantz10, A. Franz5, A. D. Frawley14, Y. Fukao26,41,42, S.-Y. Fung6, S. Gadrat30, F. Gastineau49, M. Germain49, A. Glenn50, M. Gonin27, J. Gosset11, Y. Goto41,42, R. Granier de Cassagnac27, N. Grau19, S. V. Greene53, M. Grosse Perdekamp18,42, T. Gunji8, H.-Å. Gustafsson31, T. Hachiya16,41, A. Hadj Henni49, J. S. Haggerty5, M. N. Hagiwara1, H. Hamagaki8, A. G. Hansen29, H. Harada16, E. P. Hartouni28, K. Haruna16, M. Harvey5, E. Haslum31, K. Hasuko41, R. Hayano8, X. He15, M. Heffner28, T. K. Hemmick48, J. M. Heuser41, P. Hidas23, H. Hiejima18, J. C. Hill19, R. Hobbs35, M. Holmes53, W. Holzmann47, K. Homma16, B. Hong24, A. Hoover36, T. Horaguchi41,42,51, M. G. Hur21, T. Ichihara41,42, V. V. Ikonnikov25, K. Imai26,41, M. Inaba52, M. Inuzuka8, D. Isenhower1, L. Isenhower1, M. Ishihara41, T. Isobe8, M. Issah47, A. Isupov20, B. V. Jacak48, J. Jia10,48, J. Jin10, O. Jinnouchi41,42, B. M. Johnson5, S. C. Johnson28, K. S. Joo33, D. Jouan38, F. Kajihara8,41, S. Kametani8,54, N. Kamihara41,51, M. Kaneta42, J. H. Kang56, K. Katou54, T. Kawabata8, T. Kawagishi52, A. V. Kazantsev25, S. Kelly9,10, B. Khachaturov55, A. Khanzadeev40, J. Kikuchi54, D. J. Kim56, E. Kim46, G.-B. Kim27, H. J. Kim56, Y.-S. Kim21, E. Kinney9, A. Kiss13, E. Kistenev5, A. Kiyomichi41, C. Klein-Boesing32, H. Kobayashi42, L. Kochenda40, V. Kochetkov17, R. Kohara16, B. Komkov40, M. Konno52, D. Kotchetkov6, A. Kozlov55, P. J. Kroon5, C. H. Kuberg1,*, G. J. Kunde29, N. Kurihara8, K. Kurita41,43, M. J. Kweon24, Y. Kwon56, G. S. Kyle36, R. Lacey47, J. G. Lajoie19, Y. Le Bornec38, A. Lebedev19,25, S. Leckey48, D. M. Lee29, M. K. Lee56, M. J. Leitch29, M. A. L. Leite45, X. H. Li6, H. Lim46, A. Litvinenko20, M. X. Liu29, C. F. Maguire53, Y. I. Makdisi5, A. Malakhov20, M. D. Malik35, V. I. Manko25, Y. Mao39,41, G. Martinez49, H. Masui52, F. Matathias48, T. Matsumoto8,54, M. C. McCain1,18, P. L. McGaughey29, Y. Miake52, T. E. Miller53, A. Milov48, S. Mioduszewski5, G. C. Mishra15, J. T. Mitchell5, A. K. Mohanty4, D. P. Morrison5, J. M. Moss29, T. V. Moukhanova25, D. Mukhopadhyay53,55, M. Muniruzzaman6, J. Murata43,41, S. Nagamiya22, Y. Nagata52, J. L. Nagle9,10, M. Naglis55, T. Nakamura16, J. Newby28,50, M. Nguyen48, B. E. Norman29, A. S. Nyanin25, J. Nystrand31, E. O’Brien5, C. A. Ogilvie19, H. Ohnishi41, I. D. Ojha3,53, H. Okada26,41, K. Okada41,42, O. O. Omiwade1, A. Oskarsson31, I. Otterlund31, K. Oyama8, K. Ozawa8, D. Pal53,55, A. P. T. Palounek29, V. Pantuev48, V. Papavassiliou36, J. Park46, W. J. Park24, S. F. Pate36, H. Pei19, V. Penev20, J.-C. Peng18, H. Pereira11, V. Peresedov20, D. Yu. Peressounko25, A. Pierson35, C. Pinkenburg5, R. P. Pisani5, M. L. Purschke5, A. K. Purwar48, H. Qu15, J. M. Qualls1, J. Rak19, I. Ravinovich55, K. F. Read37,50, M. Reuter48, K. Reygers32, V. Riabov40, Y. Riabov40, G. Roche30, A. Romana27,*, M. Rosati19, S. S. E. Rosendahl31, P. Rosnet30, P. Rukoyatkin20, V. L. Rykov41, S. S. Ryu56, B. Sahlmueller32, N. Saito26,41,42, T. Sakaguchi8,54, S. Sakai52, V. Samsonov40, L. Sanfratello35, R. Santo32, H. D. Sato26,41, S. Sato5,22,52, S. Sawada22, Y. Schutz49, V. Semenov17, R. Seto6, D. Sharma55, T. K. Shea5, I. Shein17, T.-A. Shibata41,51, K. Shigaki16, M. Shimomura52, T. Shohjoh52, K. Shoji26,41, A. Sickles48, C. L. Silva45, D. Silvermyr29,37, K. S. Sim24, C. P. Singh3, V. Singh3, S. Skutnik19, W. C. Smith1, A. Soldatov17, R. A. Soltz28, W. E. Sondheim29, S. P. Sorensen50, I. V. Sourikova5, F. Staley11, P. W. Stankus37, E. Stenlund31, M. Stepanov36, A. Ster23, S. P. Stoll5, T. Sugitate16, C. Suire38, J. P. Sullivan29, J. Sziklai23, T. Tabaru42, S. Takagi52, E. M. Takagui45, A. Taketani41,42, K. H. Tanaka22, Y. Tanaka34, K. Tanida41,42, M. J. Tannenbaum5, A. Taranenko47, P. Tarján12, T. L. Thomas35, M. Togawa26,41, J. Tojo41, H. Torii26,41,42, R. S. Towell1, V-N. Tram27, I. Tserruya55, Y. Tsuchimoto16,41, S. K. Tuli3, H. Tydesjö31, N. Tyurin17, T. J. Uam33, H. Valle53, H. W. van Hecke29, J. Velkovska5,53, M. Velkovsky48, R. Vertesi12, V. Veszprémi12, A. A. Vinogradov25, M. A. Volkov25, E. Vznuzdaev40, M. Wagner26,41, X. R. Wang15,36, Y. Watanabe41,42, J. Wessels32, S. N. White5, N. Willis38, D. Winter10, F. K. Wohn19, C. L. Woody5, M. Wysocki9, W. Xie6,42, A. Yanovich17, S. Yokkaichi41,42, G. R. Young37, I. Younus35, I. E. Yushmanov25, W. A. Zajc10,†, O. Zaudtke32, C. Zhang10, S. Zhou7, J. Zimányi23, L. Zolin20, and X. Zong19 (PHENIX Collaboration)
1Abilene Christian University, Abilene, Texas 79699, U.S., 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
5Brookhaven National Laboratory, Upton, New York 11973-5000, USA
6University of California - Riverside, Riverside, California 92521, USA
7China Institute of Atomic Energy (CIAE), Beijing, People’s Republic of China
8Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
9University of Colorado, Boulder, Colorado 80309, USA
10Columbia University, New York, New York 10027, USA and Nevis Laboratories, Irvington, New York 10533, USA
11Dapnia, CEA Saclay, F-91191, Gif-sur-Yvette, France
12Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary
13ELTE, Eötvös Loránd University, H - 1117 Budapest, Pázmány P. s. 1/A, Hungary
14Florida State University, Tallahassee, Florida 32306, USA
15Georgia State University, Atlanta, Georgia 30303, USA
16Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
17IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino, 142281, Russia
18University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
19Iowa State University, Ames, Iowa 50011, USA
20Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
21KAERI, Cyclotron Application Laboratory, Seoul, South Korea
22KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
23KFKI Research Institute for Particle and Nuclear Physics of the Hungarian Academy of Sciences (MTA KFKI RMKI), H-1525 Budapest 114, POBox 49, Budapest, Hungary
24Korea University, Seoul, 136-701, Korea
25Russian Research Center “Kurchatov Institute”, Moscow, Russia
26Kyoto University, Kyoto 606-8502, Japan
27Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS-IN2P3, Route de Saclay, F-91128, Palaiseau, France
28Lawrence Livermore National Laboratory, Livermore, California 94550, USA
29Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
30LPC, Université Blaise Pascal, CNRS-IN2P3, Clermont-Fd, 63177 Aubiere Cedex, France
31Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
32Institut für Kernphysik, University of Muenster, D-48149 Muenster, Germany
33Myongji University, Yongin, Kyonggido 449-728, Korea
34Nagasaki Institute of Applied Science, Nagasaki-shi, Nagasaki 851-0193, Japan
35University of New Mexico, Albuquerque, New Mexico 87131, USA
36New Mexico State University, Las Cruces, New Mexico 88003, USA
37Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
38IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, BP1, F-91406, Orsay, France
39Peking University, Beijing, People’s Republic of China
40PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region, 188300, Russia
41RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
42RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
43Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
44Saint Petersburg State Polytechnic University, St. Petersburg, Russia
45Universidade de São Paulo, Instituto de Física, Caixa Postal 66318, São Paulo CEP05315-970, Brazil
46System Electronics Laboratory, Seoul National University, Seoul, South Korea
47Chemistry Department, Stony Brook University, Stony Brook, SUNY, New York 11794-3400, USA
48Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794, USA
49SUBATECH (Ecole des Mines de Nantes, CNRS-IN2P3, Université de Nantes) BP 20722 - 44307, Nantes, France
50University of Tennessee, Knoxville, Tennessee 37996, USA
51Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan
52Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
53Vanderbilt University, Nashville, Tennessee 37235, USA
54Waseda University, Advanced Research Institute for Science and Engineering, 17 Kikui-cho, Shinjuku-ku, Tokyo 162-0044, Japan
55Weizmann Institute, Rehovot 76100, Israel
56Yonsei University, IPAP, Seoul 120-749, Korea
Received 1 February 2006; published 25 May 2006
We present an improved measurement of the double helicity asymmetry for π0 production in polarized proton-proton scattering at √s=200 GeV employing the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The improvements to our previous measurement come from two main factors: Inclusion of a new data set from the 2004 RHIC run with higher beam polarizations than the earlier run and a recalibration of the beam polarization measurements for the earlier run, which resulted in reduced uncertainties and increased beam polarizations. The results are compared to a Next to Leading Order (NLO) perturbative Quantum Chromodynamics (pQCD) calculation with a range of polarized gluon distributions.
© 2006 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.73.091102
DOI:
10.1103/PhysRevD.73.091102
PACS:
13.85.Ni, 13.88.+e, 21.10.Hw, 25.40.Ep
*Deceased †PHENIX Spokesperson: zajc@nevis.columbia.edu
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