Small-$x$ Quark and Gluon Helicity Contributions to the Proton Spin Puzzle

6533b820fe1ef96bd1279237

RESEARCH PRODUCT

Small-$x$ Quark and Gluon Helicity Contributions to the Proton Spin Puzzle

subject

Nuclear Theory (nucl-th)High Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph)Nuclear Theory FOS: Physical sciences Nuclear Experiment (nucl-ex)Nuclear Experiment High Energy Physics - Experiment

description

A small-$x$ helicity evolution has been derived in 2016-18 and received an important modification in 2022. This proceedings discusses the setup and summarizes recent results of the theoretical development, including the asymptotic behavior of helicity PDFs and $g_1$ structure function at small $x$. The recent fits to various polarized scattering data are also discussed, together with similar calculations that follow from the same framework. The results from this research program will provide important theoretical inputs for the future polarized small-$x$ measurements at the electron-ion collider (EIC).

year	journal	country	edition	language
2023-03-30

http://arxiv.org/abs/2303.17532

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