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- W1556089588 abstract "We discuss the evaluation of the nucleon isoscalar axial coupling, $g_A^{(0)}$, in the instanton vacuum, using the $1/N_c$ expansion. This approach allows a fully consistent treatment of the $U(1)_A$ anomaly. We compute the nucleon matrix element of the topological charge density, $langle N | Fwidetilde{F} | N rangle$, and show that it reduces to the matrix element of the divergence of the isoscalar axial quark current. Our arguments show that the usual evaluation of $g_A^{(0)}$ in the chiral quark soliton model is consistent with the $U(1)_A$ anomaly in leading order of $1/N_c$. Such calculations give $g_A^{(0)} = 0.36$, which is in agreement with the recent estimate by Ellis and Karliner." @default.
- W1556089588 created "2016-06-24" @default.
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- W1556089588 date "1996-04-15" @default.
- W1556089588 modified "2023-09-27" @default.
- W1556089588 title "Nucleon spin structure from the instanton vacuum" @default.
- W1556089588 hasPublicationYear "1996" @default.
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