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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeNov 11th 2018
   • PermaLink
   Author: Urs
   Format: MarkdownItexsome minimum, see the related edit announcement [here](https://nforum.ncatlab.org/discussion/9264/mass-gap/?Focus=73852#Comment_73852) <a href="https://ncatlab.org/nlab/revision/proton+spin+crisis/1">v1</a>, <a href="https://ncatlab.org/nlab/show/proton+spin+crisis">current</a>

   some minimum, see the related edit announcement here

   v1, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeSep 4th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to today's * Xiangdong Ji, Feng Yuan, Yong Zhao, _Proton spin after 30 years: what we know and what we don't?_ ([arXiv:2009.01291](https://arxiv.org/abs/2009.01291)) <a href="https://ncatlab.org/nlab/revision/diff/proton+spin+crisis/2">diff</a>, <a href="https://ncatlab.org/nlab/revision/proton+spin+crisis/2">v2</a>, <a href="https://ncatlab.org/nlab/show/proton+spin+crisis">current</a>

   added pointer to today’s

   • Xiangdong Ji, Feng Yuan, Yong Zhao, Proton spin after 30 years: what we know and what we don’t? (arXiv:2009.01291)

   diff, v2, current

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeApr 15th 2021
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to: * C. Alexandrou et al., *Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass*, Phys. Rev. D 101, 094513 ([arXiv:2003.08486](https://arxiv.org/abs/2003.08486), [doi:10.1103/PhysRevD.101.094513](https://doi.org/10.1103/PhysRevD.101.094513)) <a href="https://ncatlab.org/nlab/revision/diff/proton+spin+crisis/3">diff</a>, <a href="https://ncatlab.org/nlab/revision/proton+spin+crisis/3">v3</a>, <a href="https://ncatlab.org/nlab/show/proton+spin+crisis">current</a>

   added pointer to:

   • C. Alexandrou et al., Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass, Phys. Rev. D 101, 094513 (arXiv:2003.08486, doi:10.1103/PhysRevD.101.094513)

   diff, v3, current