Abstract
We propose a unified new approach to describe polarized and unpolarized quark distributions in the proton based on the gauge-gravity correspondence, light-front holography, and the generalized Veneziano model. We find that the spin-dependent quark distributions are uniquely determined in terms of the unpolarized distributions by chirality separation without the introduction of additional free parameters. The predictions are consistent with existing experimental data and agree with perturbative QCD constraints at large longitudinal momentum x. In particular, we predict the sign reversal of the polarized down-quark distribution in the proton at x=0.8±0.03, a key property of nucleon substructure which will be tested very soon in upcoming experiments.
Highlights
We propose a unified new approach to describe polarized and unpolarized quark distributions in the proton based on the gauge-gravity correspondence, light-front holography, and the generalized Veneziano model
We find that the spin-dependent quark distributions are uniquely determined in terms of the unpolarized distributions by chirality separation without the introduction of additional free parameters
In this Letter, we present a novel unified approach to describe the polarized and unpolarized quark distributions based on light-front holographic QCD (LFHQCD) [19] and the generalized Veneziano model [20,21,22]
Summary
We propose a unified new approach to describe polarized and unpolarized quark distributions in the proton based on the gauge-gravity correspondence, light-front holography, and the generalized Veneziano model. This contradiction with the pQCD constraint at x → 1 challenges our confidence in understanding the large-x behavior of the polarized PDFs. In this Letter, we present a novel unified approach to describe the polarized and unpolarized quark distributions based on light-front holographic QCD (LFHQCD) [19] and the generalized Veneziano model [20,21,22].
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