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Vector and Axial-vector structures of the Q+

Vector and Axial-vector structures of the Q+. Hyun-Chul Kim. NuRI & Department of Physics, Pusan National University Busan , Korea. Collaborators: T . Ledwig , M.V. Polyakov , K. Goeke. Motivation. CLAS Results.

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Vector and Axial-vector structures of the Q+

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  1. Vector and Axial-vector structures of theQ+ Hyun-Chul Kim NuRI & Department of Physics, Pusan National University Busan, Korea Collaborators: T. Ledwig, M.V. Polyakov, K. Goeke Chiral07, Nov. 13, 2007

  2. Motivation CLAS Results • Very recent CLAS experiments to search for : Null results! K* Exchange is of great importance in describing the above reactions! KNQcoupling must be very small! • Another recent DIANA experiment to search for , • V.V. Barmin et al. [DIANA Collaboration] arXiv :hep-ex / 0603017 Cross sections of Cross sections of : 0.8 nb in 90% CL : 3nb in 90% CL New results on will be reported from the LEPS soon. Chiral07, Nov. 13, 2007

  3. Transition Form factors coupling constant for NQK* coupling constant for NQK Chiral07, Nov. 13, 2007

  4. Hedgehog Ansatz: Selfconsistent Soliton: SU(3) χQSM Chiral07, Nov. 13, 2007

  5. SU(3) χQSM Chiral07, Nov. 13, 2007

  6. : Imbedding into SU(3) Collective Quantization Chiral07, Nov. 13, 2007

  7. Form factors in the cQSM Example: Chiral07, Nov. 13, 2007

  8. Results Chiral07, Nov. 13, 2007

  9. Results Mixing parameter for the octet & antidecuplet Chiral07, Nov. 13, 2007

  10. Vector meson dominance Vector meson dominance: Current Field Identity (CFI) Riazuddin-Fayyazuddin relation Chiral07, Nov. 13, 2007

  11. Results Oh et al.: No tensor couplings! Nam, Hosaka, HChK:: The present predictions turn out to be much smaller than the above references! The tensor coupling is finite and is of the same order of the vector coupling! Chiral07, Nov. 13, 2007

  12. Results Leading contributions are almost cancelled by the rotational corrections! Chiral07, Nov. 13, 2007

  13. Results For the nucleon A. Silva, HChK, D.Urbano, K. Goeke Phys. Rev. D 72 (2005) 094011 Chiral07, Nov. 13, 2007

  14. Results Chiral07, Nov. 13, 2007

  15. Summary and Conclusion • We investigated the vector and axial-vector transition form factors for N Q transitions, based on the chiral quark-soliton model. • For the electric transition, the wave-function correction turns out to be of leading order (generalized Ademollo-Gatto theorem). • The K* and K coupling constants are obtained to be very small. • The width of the Q is shown to be less than 1 MeV. • We anticipate the new result of the LEPS collaboration (T. Nakano). Chiral07, Nov. 13, 2007

  16. Thank you very much! Chiral07, Nov. 13, 2007

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