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L (1405) production in the p - p -> K 0 pS reaction

L (1405) production in the p - p -> K 0 pS reaction. 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, July 31st. Contents. MB scattering. Motivation Chiral unitary model

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L (1405) production in the p - p -> K 0 pS reaction

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  1. L(1405) production in the p-p -> K0pS reaction Tetsuo Hyodoa A. Hosakaa, E. Osetb, A. Ramosc and M. J. Vicente Vacasb a RCNP, Osaka b IFIC, Valencia c Barcelona Univ. 2003, July 31st

  2. Contents MB scattering Motivation Chiral unitary model L(1405) in the chiral unitary model Model for p-p -> K0pS Results Conclusions Experiments + a T. Hyodo, et al., nucl-th/0307005

  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) • Fink et al. PRC41, 2720 • Chiral unitary model • (2001~) • Oller et al. PLB500, 263 • Oset et al. PLB527, 99 • Jido et al. PRC66, 025203 • Hyodo et al. PRC68, 018201

  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. L(1405) in the chiral unitary model Two poles : 1390 + 66i (pS), 1426 + 16i (KN) pS mass distribution D. Jido, et al., nucl-th/0303062

  7. Mechanism of p-p -> K0pS 〜 at rest p-p c.m. frame 〜 pS c.m. frame Channel MB = KN, pS, pL, hL, hS, KX Chiral unitary model pS invariant mass distribution -> L(1405)

  8. Chiral amplitude for p-p -> K0pS Construct the initial stage interaction from ChPT. Meson 4-point vertex Yukawa vertex Generalized Yukawa vertex At low energies, these two diagrams are relevant.

  9. Chiral amplitude for p-p -> K0pS : results Do not agree!! Experiment : D. W. Tomas, et al., NPB56, 15(1973)

  10. N(1710) contribution for p-p -> K0pS Initial c.m. energy of p-p system 〜 1.9GeV -> resonance excitation in the initial stage P11 resonance : s-wave coupling to MMB N(1710)-> p N (10-20 %) -> p p N (40-90 %) -> h p N (no) Extrapolation of ppN decay pN decay

  11. Final results for p-p -> K0pS Good retult!! N(1710) Chiral terms

  12. Conclusions We calculate thep-p -> K0pSreaction using the chiral unitary model. • There aretwo mechanismsin the initial • stage interaction. • Theyfilter each one of the resonances. • Combination of the two mechanisms • gives a good description of data. chiral term N(1710) contribution : higher pole (1426+16i) : lower pole (1390+66i)

  13. Experiments : pS mass distribution 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?

  14. + a : Q production in K+p -> p+K+n Q+ : 5-quark (4 quark + 1 anti-quark) LEPS, T. Nakano et al., Phys. Rev. Lett. 91 (2003) 012002 Parity : 1/2+ ? 1/2- ? … K+p -> p+K+n Polarization test T. Hyodo, A. Hosaka, and E. Oset, nucl-th/0307105

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