# 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

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00525732
Contributor : Dominique Girod <>
Submitted on : Tuesday, October 12, 2010 - 3:29:33 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:10 PM

### Citation

A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, et al.. 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. Physical Review D, American Physical Society, 2010, 83, pp.032001. ⟨10.1103/PhysRevD.83.032001⟩. ⟨in2p3-00525732⟩

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