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How do polarized parton distributions relate to the proton spin puzzle?

Quantum chromodynamics

Valence (chemistry)

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Polarized parton distributions play a crucial role in addressing the proton spin puzzle. Studies reveal that the polarized gluon distribution within the proton is significant and positive, impacting the overall proton spin. Additionally, the gluon helicity contribution to the proton spin, as predicted in research , further emphasizes the importance of understanding polarized parton distributions. These distributions, particularly the polarized gluon content, provide insights into the spin structure of the proton, helping to reconcile experimental measurements with theoretical predictions and contributing to solving the long-standing proton spin puzzle.

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Open access•Posted Content•DOI Polarized gluon distribution in the proton from holographic light-front QCD 28 Sep 2022	Polarized gluon distributions contribute to the proton spin puzzle, with the predicted gluon helicity contribution to the proton spin being $\Delta G=0.221^{+0.056}_{-0.044}$.
DOI Polarized gluon distribution in the proton from holographic light-front QCD Bheemsehan Gurjar, Chandan Mondal, Dipankar Chakrabarti - Show less +2 more 29 Sep 2022	Polarized gluon distribution contributes to the proton spin puzzle, with $\Delta G=0.221^{+0.056}_{-0.044}$, aligning with experimental data and lattice QCD simulations, addressing the proton spin conundrum.
Polarised parton distribution functions and proton spin Peng Cheng, Yang Yu, Hui-Yu Xing, Chen Chen, Zhu-Fang Cui, Craig D. Roberts - Show less +5 more 24 Apr 2023 2 Citations	Polarised parton distribution functions, particularly the large positive polarised gluon distribution, contribute to understanding the proton spin puzzle by predicting specific values for polarised DFs and axial charges.
Open access•Posted Content•DOI Polarised parton distribution functions and proton spin 24 Apr 2023	Polarized parton distributions, especially the large positive polarized gluon distribution, contribute to understanding the proton spin puzzle by predicting key values like $\int_{0.05}^1\,dx\,\Delta G(x;\zeta_{\rm C}) = 0.214(4)$.
Open access•Journal Article•DOI Polarized gluon distribution in the proton from holographic light-front QCD 09 Mar 2023-Physical review	Polarized parton distributions, including gluon helicity, contribute to understanding the proton spin puzzle by revealing the gluon's role in the proton's total angular momentum.

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Why polarization in a lcd changes the colors?5 answersThe polarization in an LCD changes the colors because it affects the way light is transmitted and reflected within the display. The use of different polarization orientations can control and tune the color of scattered light in resonant scattering by silicon nanodisks. In LCD projectors, the rotation of polarization orientations of the analyzers can change the operational modes of LCD panels and allow for the generation of two orthogonally polarized views for stereoscopic projection. Additionally, modifying the polarization state of light exiting an LCD display can improve contrast ratios and color saturation without sacrificing image quality. By reducing the select voltage to the LCD cell, the polarization state of the light exiting a dark selected pixel compensates for misalignment between the saturation voltage polarization axis of the display and the system polarization axis of the optics.

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And why the magnetic field has a polarization plane?2 answersThe magnetic field has a polarization plane because of the alignment of the magnetic field lines. In spiral galaxies, the total magnetic fields are strongest in the spiral arms and are mostly turbulent or tangled, resulting in low radio polarization ^[Beck]. The regular fields in interarm regions are generally stronger and sometimes form magnetic arms parallel to the optical arms ^[Beck]. The field structure in galaxies is spiral, even in types without spiral arms ^[Beck]. The polarization pattern of the magnetic field follows the gas flow in galaxies with massive bars ^[Beck]. The regular field in these regions decouples from the cold gas and affects the flow of the warm gas ^[Beck]. The average strength of the total magnetic field in the Milky Way is highest in the Galactic center region and is mostly parallel to the plane ^[Beck]. The polarization plane of the magnetic field is a result of these complex interactions and alignments ^[Beck].

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