A holographic QCD and excited baryons from string theory
Abstrak
We study baryons of arbitrary isospin in a stringy holographic QCD model. In this D4-D8 holographic setting, the flavor symmetry is promoted to a gauge symmetry in the bulk, and produces, as KK modes of the gauge field, pions and spin one mesons of low energy QCD. Baryons of arbitrary isospins are represented as instanton solitons with isospin and spin quantum numbers locked, in a manner similar to the Skyrmion model. The soliton picture leads to a natural effective field theory of arbitrary baryons interacting with mesons. Couplings of baryons to axial mesons, including pions, are dominated in the large Nc limit by a direct coupling to the flavor field strength in five dimensions. We delineate the relevant couplings and determine their strengths. This work generalizes part of refs. [D.K. Hong, M. Rho, H.-U. Yee and P. Yi, Chiral dynamics of baryons from string theory, Phys. Rev. D 76 (2007) 061901 [hep-th/0701276]] and [D.K. Hong, M. Rho, H.-U. Yee and P. Yi, Dynamics of baryons from string theory and vector dominance, JHEP 09 (2007) 063 [arXiv:0705.2632]] to all excited baryons. Due to technical difficulties in introducing relativistic higher spin fields, we perform all computations in the nonrelativistic regime, which suffices for the leading Nc predictions.
Topik & Kata Kunci
Penulis (2)
Jaemo Park
Piljin Yi
Akses Cepat
PDF tidak tersedia langsung
Cek di sumber asli →- Tahun Terbit
- 2008
- Bahasa
- en
- Total Sitasi
- 33×
- Sumber Database
- Semantic Scholar
- DOI
- 10.1088/1126-6708/2008/06/011
- Akses
- Open Access ✓