Document Type

Article

Publication Date

1-2014

DOI

10.1103/PhysRevD.89.012001

Publication Title

Physical Review D

Volume

89

Issue

1

Pages

012001 (11 pages)

Abstract

The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8<η/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry ALL is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x≈0.01. The measured ALL is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry AL is also measured and found to be consistent with zero. The transverse single-spin asymmetry AN is measured over a previously unexplored kinematic range in Feynman-x and PT. Such measurements may aid our understanding of the onset and kinematic dependence of the large asymmetries observed at more forward pseudorapidity (η≈3) and their underlying mechanisms. The AN results presented are consistent with a twist-3 model prediction of a small asymmetry over the present kinematic range.

Comments

The author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged.

© 2014 American Physical Society

Original Publication Citation

Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., . . . Collaboration, S. (2014). Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √ s = 200 GeV. Physical Review D, 89(1), 012001. doi:10.1103/PhysRevD.89.012001

ORCID

0000-0002-5680-1814 (Bueltmann)

Download

Share

COinS