On the resolution of the sign of gluon polarization in the proton

Autor:	Hunt-Smith, N. T., Cocuzza, C., Melnitchouk, W., Sato, N., Thomas, A. W, White, M. J.
Rok vydání:	2024
Předmět:	High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Lattice Nuclear Theory
Druh dokumentu:	Working Paper
Popis:	Recently the possible existence of negative gluon helicity, $\Delta g$, has been observed to be compatible with existing empirical constraints, including from jet production in polarized proton-proton collisions at RHIC, and lattice QCD data on polarized gluon Ioffe time distributions. We perform a new global analysis of polarized parton distributions in the proton with new constraints from the high-$x$ region of deep-inelastic scattering (DIS). A dramatic reduction in the quality of the fit for the negative $\Delta g$ replicas compared to those with positive $\Delta g$ suggest that the negative $\Delta g$ solution cannot simultaneously account for high-$x$ polarized DIS data along with lattice and polarized jet data.
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2403.08117 Zobrazit plný text záznamu View this record from Arxiv