Dynamics of baryons from string theory and vector dominance

By D. Hong, M. Rho, Ho-Ung Yee, Piljin Yi. 2007

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We consider a holographic model of QCD from string theory, a la Sakai and Sugimoto, and study baryons. In this model, mesons are collectively realized as a five-dimensional U(NF) = U(1) × SU(NF) Yang-Mills field and baryons are classically identified as SU(NF) solitons with a unit Pontryagin number and Nc electric charges. The soliton is shown to be very small in the large 't Hooft coupling limit, allowing us to introduce an effective field . Its coupling to the mesons are dictated by the soliton structure, and consists of a direct magnetic coupling to the SU(NF) field strength as well as a minimal coupling to the U(NF) gauge field. Upon the dimensional reduction, this effective action reproduces all interaction terms between nucleons and an infinite tower of mesons in a manner consistent with the large Nc expansion. We further find that all electromagnetic interactions, as inferred from the same effective action via a holographic prescription, are mediated by an infinite tower of vector mesons, rendering the baryon electromagnetic form factors completely vector-dominated as well. We estimate nucleon-meson couplings and also the anomalous magnetic moments, which compare well with nature.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e6d74782247b9763a2067df64405944d3ef0c64f

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In Nuclear and High Energy Physics

  1. Johanna Erdmenger
  2. N. Evans
  3. I. Kirsch
  4. E. Threlfall
  5. R. Myers
  6. D. Mateos
  7. R. Thomson
  8. M. Ammon

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