Abstract
We systematically investigate tri-local (non-local) three-quark baryon fields with U L (2)×U R (2) chiral symmetry, according to their Lorentz and isospin (flavor) group representations. We note that they can also be called “nucleon wave functions” due to this full non-locality. We study their chiral transformation properties and find all the possible chiral multiplets consisting of \(J=\frac{1}{2}\) and \(J=\frac{3}{2}\) baryon fields. We find that the axial coupling constant \(|g_{A}| = \frac{5}{3}\) is only for nucleon fields belonging to the chiral representation \((\frac{1}{2},1) \oplus(1,\frac{1}{2})\), which contains both nucleon and Δ fields. Moreover, all the nucleon fields belonging to this representation have \(|g_{A}| = \frac{5}{3}\).
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Acknowledgements
This work is partly supported by the National Natural Science Foundation of China under Grant No. 11147140, and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
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Chen, HX. Baryon tri-local interpolating fields. Eur. Phys. J. C 72, 2129 (2012). https://doi.org/10.1140/epjc/s10052-012-2129-4
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DOI: https://doi.org/10.1140/epjc/s10052-012-2129-4