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 - INSPIRE

DataBETA

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

PHENIX

Collaboration

Sep, 2010

10 pages

Published in:

Phys.Rev.D 83 (2011) 032001

e-Print:

1009.6224 [hep-ex]

DOI:

10.1103/PhysRevD.83.032001

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (arXiv)

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.

Note:

432 authors from 62 institutions, 13 pages, 5 figures, and 3 tables. Submitted to Physical Review D. v2 has minor changes only to update references and reposition figures and tables. All data points plotted in Figs. 2, 4, and 5 are given in Tables I, II, and III, respectively

13.85.Ni
13.88.+e
14.20.Dh
eta: hadroproduction
parton: distribution function
cross section: ratio
helicity: asymmetry
fragmentation function
PHENIX
experimental results

References(34)

Figures(5)

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