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Strangeness Production on the Nucleon and on Nuclei

Strangeness Production on the Nucleon and on Nuclei. H. Lenske Institut für Theoretische Physik, U. Giessen. Content: Meson Production on the Nucleon The Giessen Coupled Channels Model Photo-Production of Strangeness Hadro-Production of Hypernuclei Strangeness in Nuclear Matter

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Strangeness Production on the Nucleon and on Nuclei

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  1. Strangeness Production on the Nucleon and on Nuclei H. Lenske Institut für Theoretische Physik, U. Giessen • Content: • Meson Production on the Nucleon • The Giessen Coupled Channels Model • Photo-Production of Strangeness • Hadro-Production of Hypernuclei • Strangeness in Nuclear Matter • Summary and Outlook

  2. Baryons: Quark Model vs. Dynamical Models • Our Choice of Degrees of Freedom (besides photon): • asymptotic hadronic mass eigenstates: mesons and baryons • empirical hadron masses • Lagrangian model with phenomenological coupling constants • regularization by form factors • unitary coupled channels approach

  3. The Giessen Model: Coupled Channels K-Matrix • WidthsGN* are generated dynamically • Unitarity because of K=K+, • Resonances and background within the same approach!

  4. Tree-Level Diagrams in the BS Equation

  5. Meson Production on the Nucleon

  6. gp  KL Results from the Giessen Model • separate fits to SAPHIR and CLAS data • constraints from other hadronic and g channels V. Shyklar, H.L., U. Mosel, nucl-th/0505010/PRC 72:015210 (2005)

  7. Consequences on Reaction Dynamics of KL Channels from CLAS/SAPHIR Solutions

  8. New Resonances in g+N K+L ? SAPHIR, Tran et al. (1998): structure at about 1.9 GeV in g + N K + L Mart, Bennhold (PRC 61: 012201): claim for a new D13(1960) resonance PRC 66:055212 (2002): Born term and t􀀀channel interference

  9. Photo- & Hadro-Production of h on the Proton • dominated by S11(1535) • 5/2-Partial waves account for high energy tail • destructive interference by S11(1650) • importance of P11(1710) above ~1600MeV

  10. Excitement in quasi-free eta-Production on the neutron: Indications for a new sharp resonance? Data on eta-production on the proton considered in the GiM-CC analysis: V. Crede et al. (CB-ELSA), Phys. Rev. Lett. 94, 012004 (2005), hep-ex/0311045. M. Dugger et al. (CLAS), Phys. Rev. Lett. 89, 222002 (2002). F. Renard et al. (GRAAL), Phys. Lett. B528, 215 (2002), hep-ex/0011098

  11. Predicted CC-Results for eta-Production on the Neutron CC-Results (fit) for eta-Production on the Proton

  12. Predictions for gnhn: Variation of Partial Wave Amplitude

  13. B. Krusche, MENU 2007 (CB-ELSA/TAPS Coll.)

  14. Strangeness Production on a Nucleus in a Resonance Model (COSY and HypHI Proposal@GSI) N*(1710) N*(1650) N*(1720) R. Shyam, H.L. et al, PRC 69:065205 (2004);Nucl.Phys. A764 (2006) 313; S. Bender et al., in prep.

  15. (p,K+) Strangeness Production on a Nucleus R. Shyam, H.L., U. Mosel,Nucl.Phys. A764 (2006) 313

  16. Strangeness and Hypernuclear Physics: From SU(2) Isospin to SU(3) Flavour Dynamics

  17. DDRH Approach: ab initio Density Functional Theory Dirac-Brueckner Calculation PLB345 (1995), PRC52 (1995), PRC57 (1998), PRC64 (2001), PRC66 (2002), Springer Lect. Not. (2004)

  18. DDRH Hypermatter „Equation of State“ Minimum at 10% L-content: B0=-18MeV at r0=0.21fm-3

  19. DDRH Flavour Dynamics:LSingle Particle Energies Nuclear Matter SL = 28 MeV DDRH Theory: Density Dependent NN and NL Dirac-Brueckner Vertices

  20. 89Y = L + 88Y(4-, g.s.) • jj - L Core Interactions • Tensor Interaction DDRH Spectrum for 89Y:

  21. LS0 Mixing in Asymmetric Nuclear Matter and Exotic Nuclei through the isovector mean-field: • LS0 CC Problem  Mass Eigenstates (Dm~77MeV): • Transformation Flavor EigenstatesF «Mass Eigenstates Y:

  22. Summary and Outlook • The Giessen K-Matrix Model • Kaon (Strangeness) and eta-Production on the Nucleon • Caveats in Spectra: It‘s a bump but not a resonance… • Spin Observables, w Production… • Production and Spectroscopy of Hypernuclei • Hypernuclei and YN Interactions, Spectral Functions • Hypermatter in beta-Equilibrium and Neutron Stars • The Future (1): Hypernuclear Physics at FAIR • The Future (2): Hypernuclear Physics at Europe (FP7) Main Contributors:V. Shklyar,C. Keil,U. Badarch,P. Konrad,R. Shyam

  23. TheHypHIProject@GSI & FAIR (T. Saito): Produce Hypernuclei inHeavyIon Collisions Ni+Ni @ Tlab=3AGeV T. Gaitanos, H.L.,U. Mosel: GiBUU+Coalescence+SMM

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