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Magnetic moments of N(1535) in the chiral unitary model

Magnetic moments of N(1535) in the chiral unitary model. Tetsuo Hyodo a. S. I. Nam a,b , D. Jido a and A. Hosaka a. a RCNP , Osaka b Pusan National Univ. , Korea. 2003, June 26th. Motivations. Experiments Application of the chiral unitary model

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Magnetic moments of N(1535) in the chiral unitary model

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  1. Magnetic moments ofN(1535)in the chiral unitary model Tetsuo Hyodoa S. I. Nama,b, D. Jidoa and A. Hosakaa a RCNP, Osaka b Pusan National Univ. , Korea 2003, June 26th

  2. Motivations • Experiments • Application of the chiral unitary model • Investigation of the resonance structure Recent developments of the experimental technique enable us to measure the magnetic moments of the excited baryons. Chiral unitary model Flavor SU(3) meson-baryon scatterings (s-wave) Chiral symmetry Resonances Unitarity of S-matrix

  3. Framework of the chiral unitary model Chiral perturbation theory Unitarization Generated resonances are expressed as the poles of the T-matrix. Resonances

  4. The N(1535) resonance in the chiral unitary model Positions of the poles Coupling strengths

  5. Photon coupling diagrams ChPT do not contribute ground state baryons Extract T. Hyodo et al., nucl-th/0305023

  6. Flavor SU(3) symmetry Numerical results : magnetic moments ofL(1670) D. Jido et al., Phys. Rev. C 66, 025203 (2002) SU(3) octet -> Coleman-Glashow relation Qualitatively Quantitatively : ○ : ×

  7. Flavor SU(3) symmetry SU(3) decomposition of the coupling constant • Octet components are dominant and 10, 27 • are small. • L(1670) contains a singlet component. The deviation from the SU(3) relation: • mixture of the singlet component • SU(3) breaking effects

  8. Comparison with quark model Compare the results with the quark model. The absolute values of the present results differ from those of the quark model, especially in . W.-T. Chiang et al., nucl-th/0211061 difference of pictures of the excited states

  9. Conclusions We calculate the magnetic moments of the N(1535) resonance using the chiral unitary model. • Signs of the results are consistent with the SU(3) • (Coleman-Glashow) relation. • The results qualitatively agree with those of the • quark model, but the quantitative disagreement • would reflects the difference of the pictures of the • excited baryons. D. Jido et al., Phys. Rev. C 66, 025203 (2002) T. Hyodo, S.I. Nam, D. Jido and A. Hosaka nucl-th/0305023

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