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arXiv · hep-th/0701276

Chiral Dynamics of Baryons from String Theory

Deog Ki Hong·Mannque Rho·Ho-Ung Yee·Piljin Yi
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Abstract

We study baryons in an AdS/CFT model of QCD by Sakai and Sugimoto, realized as small instantons with fundamental string hairs. We introduce an effective field theory of the baryons in the five-dimensional setting, and show that the instanton interpretation implies a particular magnetic coupling. Dimensional reduction to four dimensions reproduces the usual chiral effective action, and in particular we estimate the axial coupling $g_A$ between baryons and pions and the magnetic dipole moments, both of which are proportional to $N_c$. We extrapolate to finite $N_c$ and discuss subleading corrections.

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Deog Ki Hong, Mannque Rho, Ho-Ung Yee, Piljin Yi. 2007-02-08. Chiral Dynamics of Baryons from String Theory. https://doi.org/10.1103/physrevd.76.061901

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