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Magnetic and axial-vector transitions of the baryon antidecuplet

Magnetic and axial-vector transitions of the baryon antidecuplet. Hyun-Chul Kim. NuRI & Department of Physics, Pusan National University. Collaborators: Ghil-Seok Yang, Klaus Goeke. Outline. Motivation. Magnetic transitions. Axial-vector transitions.

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Magnetic and axial-vector transitions of the baryon antidecuplet

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  1. Magnetic and axial-vector transitions of the baryonantidecuplet Hyun-Chul Kim NuRI & Department of Physics, Pusan National University Collaborators: Ghil-Seok Yang, Klaus Goeke LENS, NOV. 11, 2006

  2. Outline Motivation • Magnetic transitions • Axial-vector transitions General Formalism in the SU(3)f χQSM “model - independent approach” Results • Transition magnetic moment for baryons • Decay width of • with axial-vector coupling constants Summary LENS, NOV. 11, 2006

  3. Motivation • Photoproduction off the neutron at the GRAAL • “ Evidence for a resonant structure at W ~ 1.675 GeV ” New nucleon-like Resonance Magnetic transitions • V.Kuznetsov [GRAAL Collaboration], arXiv:hep-ex/0409032 [Update : hep-ex / 0606065] LENS, NOV. 11, 2006

  4. Motivation • Decay width and magnetic transitions • The SELEX data: • V.V. Molchanov et al. [SELEX Collaboration], Phys. Lett. B. 590(2004) 161 LENS, NOV. 11, 2006

  5. Motivation • M. Battaglieri et al. [CLAS Collaboration] Phys.Rev.Lett.96:042001,2006 • B. McKinnon et al. [CLAS Collaboration] Phys.Rev.Lett.96:212001,2006 • Another recent DIANA experiment to search for , • V.V. Barmin et al. [DIANA Collaboration] arXiv :hep-ex / 0603017 • Several new experiments in progress [LEPS, KEK-PS E522] Axial-vector transitions • Very recent CLAS experiments to search for : Null results! LENS, NOV. 11, 2006

  6. Collective Hamiltonian in the SU(3)f QSM General Formalism in the SU(3)f χQSM SU(3)f symmetric SU(3)f symmetric breaking LENS, NOV. 11, 2006

  7. 1 General Formalism in the SU(3)f χQSM ♠ Wave function correction LENS, NOV. 11, 2006

  8. 1 = General Formalism in the SU(3)f χQSM LENS, NOV. 11, 2006

  9. “model - independent approach” Dynamical parameters = ; The transition magnetic moments experimental data for the octet magnetic moments as an input , minimizing the mean square deviation for the octet magnetic moments LENS, NOV. 11, 2006

  10. “model - independent approach” 2006 PDG 2006 PDG • G-S.Yang, H-Ch,Kim, M.Praszalowicz and K.Goeke, Phys.Rev D 70, 114002(2004) LENS, NOV. 11, 2006

  11. “model - independent approach” Dynamical parameters [31] 2006 PDG Input [39] 2006 PDG (KTeV) [40] S.D. Bass, Rev.Mod.Phys. 77 (2005) 1257 The transition axial-vector coupling constants • the experimental data for the hyperon semileptonic decay as an input . LENS, NOV. 11, 2006

  12. Results The transition magnetic moments SELEX GRAAL LENS, NOV. 11, 2006

  13. Results LENS, NOV. 11, 2006

  14. Results LENS, NOV. 11, 2006

  15. Results LENS, NOV. 11, 2006

  16. Results : LENS, NOV. 11, 2006

  17. Results [KeV] Consistent with the GRAAL data MAID reproduced the GRAAL data with the present work • H-ChK, M. Polyakov, M. Praszalowicz, G-S.Yang, and K.Goeke, Phys. Rev. D 71, 094023(2005) LENS, NOV. 11, 2006

  18. Results The axial-vector coupling constant for LENS, NOV. 11, 2006

  19. Results • Q+ decay width: : Diakonov, Petrov, Polyakov LENS, NOV. 11, 2006

  20. LENS, NOV. 11, 2006

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  23. Results • The decay width of in SU(3) flavor symmetry LENS, NOV. 11, 2006

  24. Results • The decay width of in SU(3) flavor symmetry breaking LENS, NOV. 11, 2006

  25. Summary & Conclusion • In this talk, we presented recent investigations on the magnetic and axial-vector transitions from the baryon antidecuplet, in particular,Q+ to thebaryon octet, based on the SU(3) chiral quark-soliton model in a model-independent approach (more general than the work by Diakonov et al.) • We used the octet magnetic moments and hyperon semileptonic decay constants as input to fix dynamical parameters. • The results of the magnetic transitions are shown to describe the recent GRAAL data as well as the SELEX. • The axial-vector constant for QNKwas predicted and the decay width of the Q+ was studied: The decay width of Q+ seems to be constraint by the singlet axial vector constant. With =0.3-0.37, the decay width of the Q+ turns out to be smaller than 1 MeV. LENS, NOV. 11, 2006

  26. Happy Birthday to Prof. Min! We all appreciate your efforts on Nuclear Physics Community in Korea! LENS, NOV. 11, 2006

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