1. Deeply Bound Mesonic States -Case of Kaon-
Hiroshi Toki (RCNP/Osaka)
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2. Deeply bound pionic atoms
not observed by the standard method
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3. Optical potential and wave function
Seki-Masutani optical potential
Two conditions
Strong attraction
2. Strong short range repulsion
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4. Formation of deeply bound pionic atoms
1. Deeply bound pionic atoms were predicted to exist
H. Toki and T. Yamazaki (Phys.Lett.B213(1988) 129)
2. We have to create the pion near the nuclear surface by
using (D,He3) reaction (Nucl.Phys.A530(1991)679)
The transferred proton takes care of the momentum transfer.
S. Hirenzaki, H. Toki and T. Yamazaki (Nucl. Phys. A530 (1991) 679 )
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5. Theoretical prediction and experiments Experiments were performed at GSI by K. Itahashi et al. in Pb208 (d,He3) reaction
S. Hirenzaki et al. Nucl.Phys.A530(1991)679
K. Itahashi et al Z.Phys.A355(1996)219
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6. Deeply bound kaonic states in nuclei E. Oset and H. Toki, Phys. Rev
Deeply bound kaonic states in nuclei E. Oset and H. Toki, Phys.Rev.C74(2006)
Theory part results depend on the model setting
Theorists should make the model reliable
Experimental part try to consider all the possible processes
Kaon absorption by two nucleons
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7. Chiral unitary model for S=-1 channel Oset, Ramos et al
Chiral unitary model for S=-1 channel Oset, Ramos et al. (Valencia group)
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8. KN scattering amplitude in chiral unitary model
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9. Two poles for Ｌａｍｂｄａ（１４０５）
Jido et al.
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10. Evidence for two poles
Natcher et al (2005)
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11. Kaon-Nucleon interaction in medium
Nucleon Pauli effect
Self-consistency
Kaon self-energy
Pion self-energy
Two body absorption
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12. KN optical potential in medium in chiral unitary model
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13. Nuclear kaon bound states in light nuclei Akaishi and Yamazaki PRC65(2002)044005
Kaon-nucleon interaction (one channel) fitted to Lambda(1405) and phase shift
Pion-Sigma(1193) channel only for decay
Nucleon Pauli effect is considered　（G-matrix)
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14. Kaon-nucleon interaction
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15. Deeply bound kaonic states
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16. Discovery of a strange tribaryon S(3115) in He4(K-,p) reaction Suzuki et al (KEK), PLB597 (2004) 263
T=1 state
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17. Possible interpretation
S(3115) is bound state of p+n+Lambda+pi whose threshold value is 16MeV above
LambdaHe4+pi(255) and Lambda4 emit proton(508)
KNN p(562) + Lambda
KNN p(488) + Sigma
Sigma K- p
Very surface region
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18. Coincidence data of FINUDA M. Angelo et al. PRL94 (2005) 212303K- A
Lambda
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Quasi-elastic scattering

19. Typical inclusive spectra at 400 MeV
As the scattering angle increases, the width of the peak broadens and the magnitude of the differential cross section drops. Also the centroid of the peak moves with free NN kinematics.
d /d d [mb/(sr.MeV)]
Data: Otsu PhD thesis
 (MeV)
 (MeV)
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20. Conclusion
The theoretical results depend on the Hamiltonian—need careful check with all available experiments
The experimental results are real
But, we have to consider all the possibilities from all directions
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