2021/04/08 by Daisuke Fujii, Atsushi Hosaka
Physics and Astronomy · #Baryon #Black Holes and Theoretical Physics #Excited state #Instanton #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Resonance (particle physics) #hep-ph
paper · pdf · doi:10.1103/physrevd.104.014022
published as Phys. Rev. D 104, 014022 (2021) · 6 pages
arxiv created 2021/04/08 · openalex publication_date 2021/07/29 · arxiv updated 2021/08/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We investigate the one pion decay of the Roper resonance N*(1440)\ensuremath→N\ensuremathπ in the Sakai-Sugimoto model of the holographic QCD. The nucleon and Roper resonance emerge as ground and first excited states of the collective radial motion of the instanton in the four dimensional space with one extra dimension. It is found that the ratio of the \ensuremathπNN* and \ensuremathπNN couplings, and hence the ratio of gA^NN* and gANN, is well reproduced in comparison with the experimental data. The mechanism of this result is due to the collective nature of excitations, which is very different from that of the single particle nature of the constituent quark model. Our results are obtained in the large-Nc and large \ensuremathλ ('t Hooft coupling) limit which are useful to test how baryon resonances share what are expected in these limits.