Cross section and double helicity asymmetry for eta mesons and their comparison to neutral pion production in p+p collisions at sqrt(s)=200 GeV

Measurements of double-helicity asymmetries for inclusive hadron production in polarized p+p collisions are sensitive to helicity--dependent parton distribution functions, in particular to the gluon helicity distribution, Delta(g). This study focuses on the extraction of the double-helicity asymmetr...

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Veröffentlicht in:	arXiv.org 2010-10
Hauptverfasser:	Armendariz, R, Aronson, S H, Azmoun, B, Bathe, S, Belikov, S, Berdnikov, A, Bickley, A A, Bumazhnov, V, Butsyk, S, Campbell, S, Chang, B S, Chang, W C, Chernichenko, S, Chi, C Y, Comets, M P, Dairaku, S, Deshpande, A, Dubey, A K, Emam, W S, Enokizono, A, En'yo, H, Eyser, K O, Fields, D E, Fraenkel, Z, Fukao, Y, Garishvili, I, Gunji, T, Hachiya, T, A Hadj Henni, Haggerty, J S, Harada, H, Hill, J C, Hobbs, R, Hong, B, Ikeda, Y, Isenhower, L, Ishihara, M, Isobe, T, Ivanischev, D, Joo, K S, Kamihara, N, Kamin, J, Kanou, H, Kawall, D, Kempel, T, Kim, B I, Kim, S H, Kiriluk, K, Kiss, Á, Klay, J, Koster, J, Král, A, Kubart, J, Kweon, M J, Kwon, Y, Lee, D M, Liška, T, Manko, V I, McCumber, M, Mohanty, A K, Mukhopadhyay, D, Nagamiya, S, Nagata, Y, Nagle, J L, Nagy, M I, Nakamiya, Y, Nouicer, R, Ohnishi, H, Pei, H, Purschke, M L, Reuter, M, Reygers, K, Rukoyatkin, P, Ružička, P, Sakaguchi, T, Sakai, S, Sedgwick, K, T -A Shibata, Shigaki, K, Shoji, K, Shukla, P, Silvermyr, D, Silvestre, C, Sim, K S, Skutnik, S, Soltz, R A, Stankus, P W, Stoll, S P, Tanaka, Y, Tannenbaum, M J, Thomas, T L, Toia, A, Tomášek, L, Virius, M, Wei, F, Winter, D, Yamaguchi, Y L, Yang, R, Younus, I, Yushmanov, I E
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymmetry Collisions Cross-sections Distribution functions Eta-mesons Helicity Mesons Physics - High Energy Physics - Experiment
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Zusammenfassung:	Measurements of double-helicity asymmetries for inclusive hadron production in polarized p+p collisions are sensitive to helicity--dependent parton distribution functions, in particular to the gluon helicity distribution, Delta(g). This study focuses on the extraction of the double-helicity asymmetry in eta production: polarized p+p --> eta + X, the eta cross section, and the eta/pi^0 cross section ratio. The cross section and ratio measurements provide essential input for the extraction of fragmentation functions that are needed to access the helicity-dependent parton distribution functions.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1009.6224