Double-spin asymmetry of electrons from heavy-flavor decays in p plus p collisions at root s=200 GeV

A Adare,Serguei Afanasiev, C Aidala,N N Ajitanand,Y Akiba,R Akimoto,H Altaani, J Alexander,K R Andrews, A Angerami,Kaoru Aoki,N Apadula,Eric Appelt,Y 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,A Berdnikov,Y Berdnikov, D Blau,J S Bok,Kristen E Boyle,M L Brooks, D Broxmeyer,H Buesching,V Bumazhnov,G Bunce,S Butsyk,Susan G Campbell,P Castera,Ch Chen,C Y Chi,Minsen Chiu,I J Choi,J B 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,Asoke G Datta,G David,M K Dayananda,A 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,M Finger,F Fleuret,S L Fokin,J E Frantz,A Franz,A D Frawley,Y Fukao,T Fusayasu,I Garishvili,A Glenn,Xiao Gong,M Gonin,Y Goto,R Granier De Cassagnac,N Grau,S V Greene,M Grosse Perdekamp, T Gunji,Longbiao Guo,Hansake Gustafsson,J S Haggerty,K I Hahn, H Hamagaki,J Hamblen, R Han,J Hanks,Clive Harper, Koji Hashimoto,E Haslum,R Hayano,Xin He,T K Hemmick,T Hester, J C Hill, R S Hollis,W Holzmann,K Homma,B Hong,T Horaguchi,Yasuhiko Hori,D Hornback,S Huang,T Ichihara,R Ichimiya,H Iinuma,Yoko Ikeda,K Imai,Masayuki Inaba,A Iordanova,D Isenhower,M Ishihara,M Issah,A Isupov,D Ivanischev,Y Iwanaga,B V Jacak,Jiaya Jia,X Jiang, David Neale John,B M Johnson, T W Jones,K S Joo,D Jouan,J Kamin,S Kaneti,B H Kang,J H Kang,J S Kapustinsky,K Karatsu, Mikio Kasai,D Kawall,A V Kazantsev,T Kempel,A Khanzadeev,K M Kijima,B I Kim,Dong Jin Kim,Ej Kim,Y K Kim, E Kinney, A Z Kiss,E Kistenev,D Kleinjan,P Kline,L Kochenda,B Komkov,M Konno,Jan Koster,D Kotov, A Kral,G J Kunde,K Kurita,Motohiro Kurosawa,Youngil Kwon,G S Kyle,R Lacey,Yue Shi Lai,J G Lajoie, A Lebedev, D 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,A Litvinenko,Hao Liu,M X Liu,B Love,David R Lynch, C Maguire,Y I Makdisi,A Malakhov, A Manion,V I Manko,E Mannel,Yu 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,Kazumasa Miki, A Milov,J T Mitchell,Y Miyachi, A K Mohanty,Hee Jung Moon,Y Morino,A Morreale,D P Morrison, S Motschwiller,T V Moukhanova, Tsutomu Murakami,J Murata,S Nagamiya,J L Nagle,M Naglis,M I Nagy,I Nakagawa,Y Nakamiya,K Nakamura, Tomoji Nakamura,Kazuhisa Nakano,J Newby,M Nguyen,M Nihashi,R Nouicer,A S Nyanin,C M Oakley,E Obrien,C A Ogilvie,Mikio Oka,Kenichi Okada, A Oskarsson,M Ouchida, Kyoko Ozawa,R Pak,V Pantuev, V Papavassiliou,Bae Ho Park,I H Park, S K Park,S F Pate,H Pei,Jc Peng,H Pereira,V Peresedov,D Yu Peressounko,R Petti,C Pinkenburg,R P Pisani,M Proissl,M L Purschke,Hongchang 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, P A Rukoyatkin,B Sahlmueller, Nobuo Saito,T Sakaguchi,V Samsonov,S Sano,M Sarsour,Takao Sato,M Savastio,Shohei Sawada,K Sedgwick,R Seidl, R Seto,Deepak Sharma,I Shein,Ta Shibata, K Shigaki,H H Shim,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 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,Atsushi Takahara,A Taketani,R Tanabe,Yoshio Tanaka,Subhash C Taneja,K Tanida,M J Tannenbaum,S Tarafdar,A Taranenko,E Tennant,H Themann,David G T Thomas,M Togawa,L Tomasek,M Tomasek,H Torii,R S Towell, I Tserruya,Y Tsuchimoto, Keita Utsunomiya,C Vale,H W Van Hecke

PHYSICAL REVIEW D（2013）

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摘要

We report on the first measurement of the double-spin asymmetry, A(LL), of electrons from the decays of hadrons containing heavy flavor in longitudinally polarized p + p collisions at root s = 200 GeV for p(T) = 0.5 to 3.0 GeV/c. The asymmetry was measured at midrapidity (vertical bar eta vertical bar < 0.35) with the PHENIX detector at the Relativistic Heavy Ion Collider. The measured asymmetries are consistent with zero within the statistical errors. We obtained a constraint for the polarized gluon distribution in the proton of vertical bar Delta g/g(log(10)(x) = -1.6(-0.4)(+0.5), mu = m(T)(c)vertical bar(2) < 0.030 (1 sigma) based on a leading-order perturbative quantum chromodynamics model, using the measured asymmetry. DOI: 10.1103/PhysRevD.87.012011

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