Longitudinal Double-Spin Asymmetries for pi^0s in the Forward Direction for 510 
GeV Polarized pp Collisions

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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Longitudinal Double-Spin Asymmetries for pi^0s in the Forward Direction for 510 GeV Polarized pp Collisions

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STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adam, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2018). Longitudinal Double-Spin Asymmetries for pi^0s in the Forward Direction for 510 GeV Polarized pp Collisions. Physical Review D, (98), 032013. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-325.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F8E5-3

Abstract

The STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, $A_{LL}$, for neutral pions produced at forward directions in polarized proton-proton collisions, at a center-of-mass energy of $510$ GeV. Results are given for transverse momenta in the range $2<p_{T}<10$ GeV/$c$ within two regions of pseudorapidity that span $2.65<η<3.9$. These results are sensitive to the polarized gluon parton distribution function, $Δ g(x)$, down to the region of Bjorken $x \sim 10^{-3}$. The asymmetries observed are less than $\pm 5 \cdot 10^{-3}$ in magnitude, and will help constrain the contribution to the spin of the proton from polarized gluons at low $x$, when combined with other measurements as part of a global analysis.