Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-09-30
Phys.Rev.D83:032001,2011
Physics
High Energy Physics
High Energy Physics - Experiment
432 authors from 62 institutions, 13 pages, 5 figures, and 3 tables. Submitted to Physical Review D. v2 has minor changes only
Scientific paper
10.1103/PhysRevD.83.032001
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.
Jr.
Adare Andrew
Afanasiev S.
Aidala Christine
Ajitanand N. N.
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