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

Photoproduction of K* for the study of L (1405). Tetsuo Hyodo a. Hosaka a , M. J. Vicente Vacas b and E. Oset b. a RCNP , Osaka b IFIC, Valencia. Special thanks to Prof. Morimatsu. 2004, January 30th. Contents. Chiral unitary model Motivation : Two poles?

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

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  1. Photoproduction of K* for the study of L(1405) Tetsuo Hyodoa Hosakaa, M. J. Vicente Vacasb and E. Osetb a RCNP, Osaka b IFIC, Valencia Special thanks to Prof. Morimatsu 2004, January 30th

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

  3. Motivation : 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. Poles of amplitude in S=-1 channel 8×8 ~ 1,8,8,10,10,27 attractive repulsive D. Jido, et al., Nucl. Phys. A 723, 205 (2003)

  8. 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)

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

  10. Advantage of this reaction With polarized photon beam, the exchanged particle can be identified. Clear mechanism

  11. Effective interactions for vector meson gVP coupling VPP coupling

  12. Effective interaction for baryon resonance ChU amplitude S(1385) pole term S(1385)MB coupling Form factor

  13. Total cross section

  14. Invariant mass distribution Plab = 2.5 GeV/c sqrt s ~ 2.35 GeV

  15. Isospin decomposition of pS states • Difference among charged states -> when summed up, this term vanishes • No p-wave contribution -> I=1 s-wave amplitude

  16. Invariant mass distribution 2 Plab = 2.5 GeV/c sqrt s ~ 2.35 GeV

  17. I=1, s-wave amplitdue

  18. Summary and conclusions 1 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 charged pS states in • thegp -> K*L(1405) reaction, it is • possible to isolate higher energy pole.

  19. Summary and conclusions 2 • If we observe neutral pS state, clear I=0 • distribution is obtained. • Combining three pS states, we can also • study the s-wave I=1 amplitude, where • the existence of another pole is argued. T. Hyodo, et al, nucl-th/0401051 http://www.rcnp.osaka-u.ac.jp/~hyodo/

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

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