Inclusive Double-Helicity Asymmetries In Neutral-Pion And Eta-Meson Production In <(P) Over Right Arrow> + <(P) Over Right Arrow> Collisions At Root S=200 Gev

A Adare, C Aidala,N N Ajitanand,Y Akiba,Ryoichi Akimoto,H Altaani,J P Alexander,K R Andrews, A Angerami,K Aoki,N Apadula,Eric Appelt,Yukihiko Aramaki,R Armendariz,E C Aschenauer, T C Awes,B Azmoun,V Babintsev,M Bai,B Bannier,K N Barish,B Bassalleck,Austin Basye,S Bathe,V Baublis,C Baumann,A Bazilevsky,R Belmont, J Benbenjamin,R Bennett, D Blau,J S Bok,K Boyle,M L Brooks, D Broxmeyer,H Buesching,V Bumazhnov,G Bunce,S Butsyk,S Campbell,P Castera, C H Chen,C Y Chi, M Chiu,I J Choi,Jae Boong Choi, R K Choudhury,P Christiansen, T Chujo,O Chvala,V Cianciolo,Zvi Hirsh Citron,B A Cole,Z Conesa Del Valle,M Connors,M Csanad, T Csoergo,S Dairaku,A Datta,G David,M K Dayananda,A S Denisov,A Deshpande,E J Desmond,K V Dharmawardane,O Dietzsch,A Dion, M Donadelli,O Drapier,A Drees,K A Drees,J M Durham,A Durum,L Dorazio,Y V Efremenko,T Engelmore,A Enokizono,H Enyo, S Esumi,B Fadem,D E Fields,Michael Finger,F Fleuret,S L Fokin,J E Frantz,A Franz,A D Frawley,Y Fukao,T Fusayasu,C Gal,I Garishvili,Frank J Giordano,A Glenn,Xiao Gong,M Gonin,Y Goto,R Granier De Cassagnac,N Grau,S V Greene,M Grosse Perdekamp,T Gunji,Liang Guo,Hansake Gustafsson,J S Haggerty,K I Hahn, H Hamagaki,J Hamblen,Rui Han,J Hanks,Clive Harper, Keiichi Hashimoto,E Haslum, R S Hayano,Xin He,T K Hemmick,T Hester, J C Hill, R S Hollis,W Holzmann,K Homma,B Hong,T Horaguchi,Yasuto Hori,D Hornback,Jing Huang,Shiyu Huang,T Ichihara,R Ichimiya,H Iinuma,Y Ikeda, Kozo Imai,M Inaba,A Iordanova,D Isenhower,M Ishihara,M Issah,D Ivanischev,Yoshitaka Iwanaga,B V Jacak,Jiaya Jia,Xue Jiang, D John,B M Johnson, T W Jones,K S Joo,D Jouan,J Kamin,S Kaneti,B H Kang,J S Kang,J S Kapustinsky,K Karatsu,Masaharu Kasai,D Kawall,A V Kazantsev,T Kempel,A Khanzadeev,K M Kijima,B I Kim,Dae Joong Kim,Eung Ju Kim,Y J Kim, E Kinney,A Kiss,E Kistenev,D Kleinjan,P Kline,L Kochenda,B Komkov,M Konno,J Koster,D Kotov, A Kral,G J Kunde,K Kurita,Minoru Kuribayashi Kurosawa,Youngman Kwon,G S Kyle,R Lacey,Yue Shi Lai,J G Lajoie, A Lebedev,David M Lee,J Lee,K B Lee,S R Lee,M J Leitch, M A L Leite,X Li,S H Lim,L A Linden Levy, Hebing Liu,M X Liu,B Love,David W Lynch, C Maguire,Y I Makdisi, A Manion,V I Manko,E Mannel,Y Mao,H Masui,M Mccumber,P L Mcgaughey,D Mcglinchey,C Mckinney,N Means,M Mendoza,B Meredith, Y Miake,T Mibe, A C Mignerey,Kunio Miki, A Milov,J T Mitchell,Y Miyachi, A K Mohanty,Hyeun Jun Moon,Y Morino,A Morreale,D P Morrison, S Motschwiller,T V Moukhanova,Toshio Murakami,J Murata,S Nagamiya,J L Nagle,M Naglis,M I Nagy,I Nakagawa,Y Nakamiya,K Nakamura,T Nakamura,Kazuhisa Nakano,J Newby,M Nguyen,M Nihashi,R Nouicer,A S Nyanin,C M Oakley,Elisabeth Obrien, C A Ogilvie,Makoto Oka, Kosuke Okada, A Oskarsson,Mamoru Ouchida,K Ozawa,R Pak,V Pantuev, V Papavassiliou,Bae Ho Park,I H Park, S K Park,S F Pate,L Patel,H Pei, J C Peng,H Pereira,D Yu Peressounko,R Petti,C Pinkenburg,R P Pisani,M Proissl,M L Purschke,Haijun Qu,J Rak,I Ravinovich,K F Read,K Reygers,V Riabov,Y Riabov,E Richardson,D Roach,G Roche,S D Rolnick,M Rosati,Sarah Rosendahl,B Sahlmueller,Norio Saito,T Sakaguchi,V Samsonov, Soichi Sano,M Sarsour,Toshiyuki Sato,M Savastio,Shinichi Sawada,K Sedgwick,R Seidl, R Seto,D Sharma,I R Shein,T A Shibata, K Shigaki,H H Shim,M Shimomura,K Shoji,P K Shukla,A Sickles,C L Silva, D Silvermyr,C Silvestre,K S Sim,B K Singh,C P Singh,V Singh,M Slunecka, T Sodre,R A Soltz,W E Sondheim,S P Sorensen,I V Sourikova,P W Stankus, E Stenlund,S P Stoll, T Sugitate,A Sukhanov,Jian Sun,J Sziklai,E M Takagui,Akira Takahara,A Taketani,R Tanabe,Yasuhito Tanaka,Subhash C Taneja,K Tanida,M J Tannenbaum,S Tarafdar,A Taranenko,E Tennant,H Themann,D Thomas,M Togawa,L Tomasek,M Tomasek,H Torii,R S Towell, I Tserruya,Y Tsuchimoto, Keita Utsunomiya,C Vale,H W Van Hecke,E Vazquezzambrano,A Veicht, J Velkovska,R Vertesi

PHYSICAL REVIEW D（2014）

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摘要

Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, A(LL), for pi(0) and eta production in root s = 200 GeV polarized p + p collisions. Comparison of the pi(0) results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, Delta G, in the proton in the probed Bjorken x range. The effect of adding the new 2009 pi(0) data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit Delta G(DSSV)([0.05,0.2]) = 0.06(-0.15)(+0.11) in the range 0.05 < x < 0.2, with the uncertainty at Delta chi(2) = 9 when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of Delta G(DSSV)([0.05,0.2]) between 0.02 and 0.12, demonstrating the need for full treatment of the experimental systematic uncertainties in future global analyses.

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