Longitudinal double-spin asymmetry for inclusive jet and dijet production in 
polarized proton collisions at sqrt{s}=200 GeV

STAR Collaboration,; Abdallah, M.S.; Schmitz, N.; Seyboth, P.; et al.,

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Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at sqrt{s}=200 GeV

MPS-Authors

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

Abdallah, M.S.
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, Abdallah, M., Schmitz, N., Seyboth, P., & et al. (2021). Longitudinal double-spin asymmetry for inclusive jet and dijet production in polarized proton collisions at sqrt{s}=200 GeV. Physical Review D, 103, L091103. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-265.

Cite as: https://hdl.handle.net/21.11116/0000-000A-1BF2-7

Abstract

We report high-precision measurements of the longitudinal double-spin asymmetry, A_{LL}, for midrapidity inclusive jet and dijet production in polarized pp collisions at a center-of-mass energy of sqrt{s}=200\,\mathrm{GeV}. The new inclusive jet data are sensitive to the gluon helicity distribution, Delta g(x,Q^2), for gluon momentum fractions in the range from x \simeq 0.05 to x \simeq 0.5, while the new dijet data provide further constraints on the x dependence of Delta g(x,Q^2). The results are in good agreement with previous measurements at sqrt{s}=200\,\mathrm{GeV} and with recent theoretical evaluations of prior world data. Our new results have better precision and thus strengthen the evidence that Delta g(x,Q^2) is positive for x > 0.05.