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Photoproduction of K * for the study of the structure of L (1405)

Photoproduction of K * for the study of the structure of L (1405). Tetsuo Hyodo a. A. Hosaka a , E. Oset b , A. Ramos c and M. J. Vicente Vacas b. a RCNP , Osaka b IFIC, Valencia c Barcelona Univ. 2003, November 4th. Contents. Introduction Motivation : Two poles?

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Photoproduction of K * for the study of the structure of L (1405)

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  1. Photoproduction of K* for the study of the structure of L(1405) Tetsuo Hyodoa A. Hosakaa, E. Osetb, A. Ramosc and M. J. Vicente Vacasb a RCNP, Osaka b IFIC, Valencia c Barcelona Univ. 2003, November 4th

  2. Contents • Introduction • Motivation : Two poles? • Chiral unitary model • Framework of the chiral unitary model • Example : K-p scatterings • Pole structure of L(1405) • Example : p-p -> K0pS • K*L(1405) production • Effective interactions • Numerical results

  3. Motivations : Two poles? There are two poles of the scattering amplitude around nominal L(1405) energy region. L(1405) : JP=1/2-, I=0 • Cloudy bag model • (1990) • J. Fink et al. PRC41, 2720 • Chiral unitary model • (2001~) • J. A. Oller et al. PLB500, 263 • E. Oset et al. PLB527, 99 • D. Jido et al. PRC66, 025203 • T. Hyodo et al. PRC68, 018201 ChU model, T. Hyodo

  4. Chiral unitary model Flavor SU(3) meson-baryon scatterings (s-wave) Chiral symmetry Unitarity of S-matrix Low energy behavior Non-perturbative resummation Dynamical generation Resonances L(1405), L(1670), N(1535), S(1620), X(1620)

  5. Framework of the chiral unitary model Chiral perturbation theory Unitarization Generated resonances are expressed as poles of the scattering amplitude. Resonances

  6. Total cross sections of K-p scatterings T. Hyodo, et al., Phys. Rev. C 68, 018201 (2003)

  7. L(1405) in the chiral unitary model pS mass distribution 1390 + 66i (pS) 1426 + 16i (KN) D. Jido, et al., Nucl. Phys. A 723, 205 (2003)

  8. Example : the p-p -> K0pS reaction Chiral unitary model Chiral term N(1710)

  9. Results for p-p -> K0pS Mass distribution Total cross sections [mb] S(1385) effect Good agreement • There aretwo mechanismsin the initial • stage interaction, which filter each one • of the resonances. T. Hyodo, et al., nucl-th/0307005, Phys. Rev. C, in press

  10. Photoproduction of K* L(1405) Only K-p channel appears at the initial stage Higher pole ??

  11. Effective interactions for meson part gVP coupling VPP coupling

  12. Effective interaction for S(1385) S(1385)MB coupling K-P -> S(1385) -> MB amplitude SU(6)symmetry

  13. Experiments : pS mass distribution Plab = 2.5 GeV/c sqrt s ~ 2.35 GeV Preliminary

  14. Summary and conclusions We study thestructure ofL(1405) using the chiral unitary model. • There aretwo polesof the scattering • amplitude around nominal L(1405). Pole 1 (1426+16i) : strongly couples to KN state Pole 2 (1390+66i) : strongly couples to pS state • By observing the pS mass distribution in • thegp -> K*L(1405) reaction, it could be • possible to isolate higher energy pole. http://www.rcnp.osaka-u.ac.jp/~hyodo/index_e.html

  15. Appendix : other processes gp -> K-pS J.C. Nacher, et al., PLB445, 55(1999) Spring-8 K-p -> gpS J.C. Nacher, et al., PLB461, 299(1999) J-PARC?

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