Inclusive cross section and double helicity asymmetry for π0 production in p+p collisions at s=62.4 GeV

A. Adare, S. Afanasiev, C. Aidala,N. N. Ajitanand,Y. Akiba,H. Al-Bataineh,J. Alexander,K. Aoki, L. Aphecetche,J. Asai,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. Chang,W. Chang,J.-L. Charvet, S. Chernichenko,C. Chi, M. Chiu,I. Choi,R. Choudhury, T. Chujo,P. Chung, A. Churyn,V. Cianciolo,Z. Citron,B. Cole,P. Constantin, M. Csanád,T. Csörgő, T. Dahms,S. Dairaku,K. Das,G. David,A. Denisov,D. d’Enterria,A. Deshpande,E. Desmond,O. Dietzsch,A. Dion, M. Donadelli,O. Drapier,A. Drees,K. Drees,A. Dubey,A. Durum, D. Dutta,V. Dzhordzhadze,Y. Efremenko,J. Egdemir, F. Ellinghaus,T. Engelmore,A. Enokizono,H. En’yo, S. Esumi,K. Eyser,B. Fadem,D. Fields,M. Finger, F. Fleuret,S. Fokin, Z. Fraenkel,J. Frantz,A. Franz,A. Frawley,K. Fujiwara,Y. Fukao,T. Fusayasu,I. Garishvili,A. Glenn,H. Gong, M. Gonin,J. Gosset,Y. Goto,R. de Cassagnac, N. Grau,S. Greene,M. Perdekamp,T. Gunji,H.-Å. Gustafsson,A. Henni,J. Haggerty, H. Hamagaki, R. Han,E. Hartouni,K. Haruna,E. Haslum, R. Hayano,M. Heffner,T. Hemmick,T. Hester,X. He,J. 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. Jacak, J. Jia,J. Jin,B. Johnson,K. Joo,D. Jouan,F. Kajihara,S. Kametani,N. Kamihara,J. Kamin,J. Kang,J. Kapustinsky,D. Kawall,A. Kazantsev,T. Kempel,A. Khanzadeev,K. Kijima,J. Kikuchi,B. Kim,D. Kim,E. Kim,S. 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. Kunde,K. Kurita,M. Kurosawa,M. Kweon,Y. Kwon,G. Kyle,R. Lacey, Y. Lai,J. Lajoie,D. Layton, A. Lebedev,D. Lee,K. Lee,T. Lee,M. Leitch,M. Leite, B. Lenzi,P. Liebing,T. Liška, A. Litvinenko,H. Liu,M. Liu,X. Li,B. Love,D. Lynch, C. Maguire,Y. Makdisi,A. Malakhov,M. Malik,V. Manko,E. Mannel,Y. Mao,L. Mašek,H. Masui,F. Matathias,M. McCumber,P. McGaughey,N. Means,B. Meredith, Y. Miake,P. Mikeš,K. Miki,A. Milov,M. Mishra,J. Mitchell,A. Mohanty,Y. Morino,A. Morreale,D. Morrison,T. Moukhanova,D. Mukhopadhyay,J. Murata,S. Nagamiya,J. Nagle,M. Naglis,M. Nagy,I. Nakagawa,Y. Nakamiya,T. Nakamura,K. Nakano,J. Newby,M. Nguyen,T. Niita,R. Nouicer,A. Nyanin,E. O’Brien,S. Oda,C. Ogilvie,H. Okada, K. Okada,M. Oka,Y. Onuki, A. Oskarsson,M. Ouchida,K. Ozawa,R. Pak,A. Palounek,V. Pantuev, V. Papavassiliou,J. Park, W. Park,S. Pate,H. Pei,J.-C. Peng,H. Pereira,V. Peresedov,D. Peressounko,C. Pinkenburg,M. Purschke, A. Purwar,H. Qu,J. Rak,A. Rakotozafindrabe,I. Ravinovich,K. Read,S. Rembeczki,M. Reuter,K. Reygers,V. Riabov,Y. Riabov,D. Roach, G. Roche,S. Rolnick,M. Rosati,S. Rosendahl, P. Rosnet,P. Rukoyatkin,P. Ružička,V. Rykov,B. Sahlmueller,N. Saito,T. Sakaguchi,S. Sakai,K. Sakashita,V. Samsonov,T. Sato,S. Sawada,K. Sedgwick,J. Seele,R. Seidl,A. Semenov,V. Semenov, R. Seto,D. Sharma,I. Shein,T.-A. Shibata, K. Shigaki,M. Shimomura,K. Shoji,P. Shukla,A. Sickles,C. Silva, D. Silvermyr,C. Silvestre,K. Sim,B. Singh,C. Singh,V. Singh,M. Slunečka,A. Soldatov,R. Soltz,W. Sondheim,S. Sorensen,I. Sourikova,F. Staley,P. Stankus, E. Stenlund,M. Stepanov,A. Ster,S. Stoll, T. Sugitate, C. Suire,A. Sukhanov,J. Sziklai,E. Takagui,A. Taketani,R. Tanabe,Y. Tanaka, K. Tanida,M. Tannenbaum,A. Taranenko,P. Tarján,H. Themann,T. Thomas,M. Togawa,A. Toia,L. Tomášek,Y. Tomita,H. Torii,R. Towell,V. N. Tram, I. Tserruya,Y. Tsuchimoto,C. Vale,H. Valle,H. van Hecke,A. Veicht, J. Velkovska,R. Vertesi, A. Vinogradov,M. Virius, V. Vrba,E. Vznuzdaev,D. Walker,X. Wang,Y. Watanabe,F. Wei,J. Wessels,S. White,S. Williamson,D. Winter,C. Woody,M. Wysocki,W. Xie, Y. Yamaguchi,K. Yamaura,R. Yang,A. Yanovich,J. Ying,S. Yokkaichi,G. Young,I. Younus,I. Yushmanov,W. Zajc,O. Zaudtke,C. Zhang,S. Zhou,L. Zolin

PHYSICAL REVIEW D（2009）

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摘要

The PHENIX experiment presents results from the RHIC 2006 run with polarized p + p collisions at root s = 62.4 GeV, for inclusive pi(0) production at midrapidity. Unpolarized cross section results are measured for transverse momenta p(T) = 0.5 to 7 GeV/c. Next-to-leading order perturbative quantum chromodynamics calculations are compared with the data, and while the calculations are consistent with the measurements, next-to-leading logarithmic corrections improve the agreement. Double helicity asymmetries A(LL) are presented for p(T) = 1 to 4 GeV/c and probe the higher range of Bjorken x of the gluon (x(g)) with better statistical precision than our previous measurements at root s = 200 GeV. These measurements are sensitive to the gluon polarization in the proton for 0.06 < x(g) < 0.4.

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