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Photoproduction of Q and its vector and axial-vector structure

Photoproduction of Q and its vector and axial-vector structure. Hyun-Chul Kim ( 金鉉哲 ). Department of Physics, Inha University. Collaborators: T. Ledwig, K. Goeke, Seung-il Nam. Motivation. CLAS Results. Very recent CLAS experiments to search for :: Null results!.

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Photoproduction of Q and its vector and axial-vector structure

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  1. Photoproductionof Qandits vector and axial-vector structure Hyun-Chul Kim (金鉉哲) Department of Physics, InhaUniversity Collaborators: T. Ledwig, K. Goeke, Seung-il Nam NSTAR 2009, Beijing, China

  2. Motivation CLAS Results • Very recent CLAS experiments to search for :: Null results! K* Exchange is of great importance in describing the above reactions! K*NQ & KNQcouplings must be very small! KEK Results • Miwa et al, Phys. Rev. C 77, 045203: No clear peak! Cross sections of Cross sections of : 0.8 nb in 90% CL : 3nb in 90% CL Diff. Cross sections for : 3.5 mb/Sr in 90% CL K*NQcoupling must be very small! NSTAR 2009, Beijing, China

  3. Motivation • Did the CLAS results put a period to the existence of the pentaquark? • Wohl in 2008 Review of Particle Physics:“The whole story – discoveries themselves, the tidal waves of papers by theorists and phenomenologists that followed, and the eventual “undiscovery” – is a curious episode in the history of science.” • In the meanwhile…… NSTAR 2009, Beijing, China

  4. Motivation DIANA Results • Another recent DIANA experiment to search for , V.V. Barmin et al. [DIANA Collaboration] arXiv :hep-ex / 0603017 KNQcouplings must be also tiny! SVD Results A.Aleev et al. [SVD Collaboration] arXiv :0803.3313 NSTAR 2009, Beijing, China

  5. Motivation LEPS New Results T. Nakano et al. [LEPS Collaboration] Phys. Rev. C 79, 025210 K*NQcouplings must be very small! Future experiments at J-PARC to search for NSTAR 2009, Beijing, China

  6. Motivation • If the exists or not…… • If it exists, its width must be below 1 MeV and its existence must be reaction-dependent! • At any rate, K*NQand KNQ couplings must be very small! • In the present talk, we aim at investigating these two coupling constants, based on which we study photoproduction of the . • Wewill also estimate the cross sections of the photoproduction of the . NSTAR 2009, Beijing, China

  7. Vector and Axial-vector transition form factors coupling constant for NQK* coupling constant for NQK NSTAR 2009, Beijing, China

  8. Chiral quark-soliton picture NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  9. Chiral quark-soliton picture NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  10. Chiral quark-soliton picture NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  11. Chiral quark-soliton picture valence level: energy decreases sea levels: energy increases system stabilzes NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  12. Chiral quark-soliton model Nucleon consisting of Nc quarks NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  13. Chiral quark-soliton model Selfconsistent Soliton: Classical solitons Hedgehog Ansatz: No Free parameter to play with! All parameters have been fixed before. NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  14. Chiral quark-soliton model Collective quantization SU(2) Witten imbedding into SU(3): SU(2)XU(1) NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  15. Chiral quark-soliton model Baryon observables We treat the angular frequency and strange quark mass perturbatively. NSTAR 2009, Beijing, China HChK et al. Prog. Part. Nucl. Phys. Vol.37, 91 (1996)

  16. Results NSTAR 2009, Beijing, China T.Ledwig, HChK, K. Goeke, Nucl.Phys. A 811, 353-377(2008).

  17. Results Mixing parameter for the octet & antidecuplet NSTAR 2009, Beijing, China T.Ledwig, HChK, K. Goeke, Nucl.Phys. A 811, 353-377(2008).

  18. Vector meson dominance Vector meson dominance: Current Field Identity (CFI) Riazuddin-Fayyazuddin relation NSTAR 2009, Beijing, China T.Ledwig, HChK, K. Goeke, Nucl.Phys. A 811, 353-377(2008).

  19. 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! NSTAR 2009, Beijing, China T.Ledwig, HChK, K. Goeke, Nucl.Phys. A 811, 353-377(2008).

  20. Results For test, we have derived octet baryon coupling constants within the same formalism, for example, comparable to those from the Nijmegen potential. The coupling constants for the Theta are an order-of-magnitude smaller! NSTAR 2009, Beijing, China

  21. Results Leading contributions are almost cancelled by the rotational corrections! NSTAR 2009, Beijing, China

  22. Results For the nucleon Axial-vector constantsare well reproduced! A. Silva, HChK, D.Urbano, K. Goeke Phys. Rev. D 72 (2005) 094011 NSTAR 2009, Beijing, China

  23. Results Delta decay is quite underestimated! (No meson-loop corrections!) (Present result) (Experimental data) NSTAR 2009, Beijing, China T.Ledwig, HChK, K. Goeke, Phys.Rev. D 78, 054005 (2008).

  24. Analysis of Diakonov et al. revisited D.Diakonov, V. Petrov, M. Polyakov,Zeit. Phys. A 359, 305 (1997) Model-dependent ratiotaken from Blotz et alwithout symmetry conserving quantization Present result Had Diakonov et al. used the present result, they woud get the decay width: instead of 15 MeV (30 MeV). without changing NSTAR 2009, Beijing, China

  25. Results < 1 MeV ! DIANA Collaboration NSTAR 2009, Beijing, China T.Ledwig, HChK, K. Goeke, Phys.Rev. D 78, 054005 (2008).

  26. Results Total cross sections NSTAR 2009, Beijing, China S.i. Nam and HChK, Phys. Rev. D 79, 034031 (2009)

  27. Results Total cross sections with and without K* NSTAR 2009, Beijing, China S.i. Nam and HChK, Phys. Rev. D 79, 034031 (2009)

  28. Results Differential cross sections with and without K* Enhancement in the forward direction! NSTAR 2009, Beijing, China S.i. Nam and HChK, Phys. Rev. D 79, 034031 (2009)

  29. Results Differential cross sections with and without K* NSTAR 2009, Beijing, China S.i. Nam and HChK, Phys. Rev. D 79, 034031 (2009)

  30. Results Beam asymmetries with and without K* NSTAR 2009, Beijing, China S.i. Nam and HChK, Phys. Rev. D 79, 034031 (2009)

  31. 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 also estimated the total cross sections, differential cross sections, and beam asymmetries for the Q photoproduction with the present results. NSTAR 2009, Beijing, China

  32. Thank you very much! NSTAR 2009, Beijing, China

  33. Backup materials Collective operators for the baryon-baryon-meson coupling constants Leading order: Rotational corrections: NSTAR 2009, Beijing, China

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