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Baryons from Instantons in Holographic QCD

2007; Oxford University Press; Volume: 117; Issue: 6 Linguagem: Inglês

10.1143/ptp.117.1157

1347-4081

H. Hata, Tadakatsu Sakai, Shigeki Sugimoto, Shinichiro Yamato,

Particle physics theoretical and experimental studies

We consider aspects of dynamical baryons in a holographic dual of QCD that is formulated on the basis of a D4/D8-brane configuration. We construct a soliton solution carrying a unit baryon number and show that it is obtained as an instanton solution of four-dimensional Yang-Mills theory with fixed size. The Chern-Simons term on the flavor D8-branes plays a crucial role of protecting the instanton from collapsing to zero size. By quantizing the collective coordinates of the soliton, we derive the baryon spectra. Negative-parity baryons as well as baryons with higher spins and isospins can be obtained in a simple manner.