Theory Seminar

KEK 素粒子原子核研究所・理論セミナー

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TITLE：	Baryon with Massive Strangeness in Holographic QCD
	（in English)
SPEAKER：	Dr. Takaaki Ishii (RIKEN)
DATE：	September 28 (Tue.) 11:00-12:00
PLACE:	Kenkyu Honkan, Conference Room 1

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　　　 （ABSTRACT）

The Sakai-Sugimoto model is a holographic of large N_c massless QCD, while quark masses are non-zero in real QCD. I talk on studies of the Sakai-Sugimoto model where the strange quark are considered as massive. In particular, we focus on spectra of baryons with strangeness. First, I compute mass shifts in the spectra of three-flavor baryons at the leading order in perturbation in quark masses by using the SU(3) collective coordinate quantization of the baryons. Comparison with experimental data shows an agreement only qualitatively. This part is based on arXiv:0910.1179. Second, I consider an approach to realize a hyperon as a bound-state of a two-flavor baryon and a kaon, which approach has been known in the Skyrme model as the bound-state approach to strangeness. As a simple case of study, pseudo-scalar kaon is considered as fluctuation around a baryon. I find strongly-bound hyperon-states are absent, different from the case of the Skyrme model. Observed is a weak bound-state which would correspond to \Lambda(1405). The second part is based on arXiv:1009.0986.