Quark orbital angular momentum as a chiral magnetic effect
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910247474429952 |
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| author | Kim, June-Young Won, Ho-Yeon Weiss, Christian |
| author_facet | Kim, June-Young Won, Ho-Yeon Weiss, Christian |
| contents | The flavor-nonsinglet ($u - d$) quark angular momentum (AM) in the proton is computed based on the effective spin-flavor dynamics emerging from chiral symmetry breaking by QCD instantons. The QCD AM operators are converted to effective spin-flavor operators expressing instanton-induced chiral interactions. A large negative orbital AM $L_{u - d}$ arises as a ``chiral magnetic effect'' of the interaction of the quarks with the chiral mean field in the proton in the large-$N_c$ limit. It cancels part of the large positive spin AM $S_{u-d}$ and reduces the total AM $J_{u-d} = L_{u-d} + S_{u-d}$, in agreement with lattice QCD calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_23125 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quark orbital angular momentum as a chiral magnetic effect Kim, June-Young Won, Ho-Yeon Weiss, Christian High Energy Physics - Phenomenology The flavor-nonsinglet ($u - d$) quark angular momentum (AM) in the proton is computed based on the effective spin-flavor dynamics emerging from chiral symmetry breaking by QCD instantons. The QCD AM operators are converted to effective spin-flavor operators expressing instanton-induced chiral interactions. A large negative orbital AM $L_{u - d}$ arises as a ``chiral magnetic effect'' of the interaction of the quarks with the chiral mean field in the proton in the large-$N_c$ limit. It cancels part of the large positive spin AM $S_{u-d}$ and reduces the total AM $J_{u-d} = L_{u-d} + S_{u-d}$, in agreement with lattice QCD calculations. |
| title | Quark orbital angular momentum as a chiral magnetic effect |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.23125 |