*(1440) N Decays in a Hybrid Baryon Model K. Khosonthongkee † , N. Supanam and Y. Yan School of Physics, Suranaree University of Technology, Nakhon Ratchasima, Thailand 18 th International IUPAP Conference on Few-Body Problems in Physics (FB18) Santos, São Paulo, Brazil August 24, 2006
Decays in a Hybrid Baryon Model. K. Khosonthongkee † , N. Supanam and Y. Yan. School of Physics, Suranaree University of Technology, Nakhon Ratchasima, Thailand. 18 th International IUPAP Conference on Few-Body Problems in Physics (FB18). Santos, São Paulo, Brazil August 24, 2006. Outline. - PowerPoint PPT Presentation
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*(1440)N Decays in a Hybrid Baryon Model
K. Khosonthongkee†, N. Supanam and Y. Yan
School of Physics, Suranaree University of Technology,Nakhon Ratchasima, Thailand
18th International IUPAP Conference on Few-BodyProblems in Physics (FB18)
Santos, São Paulo, Brazil August 24, 2006
Outline
• Introduction• The Hybrid Baryon Model• Interaction Operator• The transition amplitude for N*(1440)
decay• Preliminary Results• Conclusions
Introduction
Strong Interaction
Atom
Nucleus
electron
Nucleon
fundamental theoryof strong interaction
QCD
Low energy
???
Model
Baryon excitation states
Nucleon internal structure
understanding
J= 3/2, I = 3/2, P=+1
J= 1/2, I = 1/2, P=+1
J= 1/2, I = 1/2, P=+1
∆(1232)
N*(1440) Intrinsic excitation of Nucleon at energy around 500 Mev
N, Nucleon(939)
N*(1440), Roper Resonance
Simple Model for N*(1440)
N*(1440) is three-quark with the first radial excitation
N*(1440) too low mass to be radial excitation
problems of the models
Various quarks models
Met difficulties to explain its mass and electromagnetic couplings