Dynamics of Baryons from String Theory and Vector Dominance

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dc.creatorHong, Deog Ki
dc.creatorRho, Mannque
dc.creatorYee, Ho-Ung
dc.creatorYi, Piljin
dc.date2007-05-18
dc.date2009-03-10
dc.date.accessioned2026-07-07T12:50:06Z
dc.date.available2026-07-07T12:50:06Z
dc.descriptionWe 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(N_F)=U(1)\times SU(N_F)$ Yang-Mills field and baryons are classically identified as $SU(N_F)$ solitons with a unit Pontryagin number and $N_c$ electric charges. The soliton is shown to be very small in the large 't Hooft coupling limit, allowing us to introduce an effective field ${\cal B}$. Its coupling to the mesons are dictated by the soliton structure, and consists of a direct magnetic coupling to the $SU(N_F)$ field strength as well as a minimal coupling to the $U(N_F)$ 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 $N_c$ 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.
dc.description65pages, 3 figures, vector mesons and axial-vector mesons are now canonically normalized (comparisons with data and conclusions unaffected)
dc.identifierhttps://arxiv.org/abs/0705.2632
dc.identifierhttp://arxiv.org/abs/0705.2632
dc.identifierJHEP0709:063,2007
dc.identifierdoi:10.1088/1126-6708/2007/09/063
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222586
dc.subjectHigh Energy Physics - Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleDynamics of Baryons from String Theory and Vector Dominance
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