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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

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


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


The Giessen Model: Coupled Channels K-Matrix

  • WidthsGN* are generated dynamically

  • Unitarity because of K=K+,

  • Resonances and background within the same approach!




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)


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


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


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


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


Predicted Indications for a new sharp resonance? CC-Results for eta-Production on the Neutron

CC-Results (fit) for eta-Production on the Proton


Predictions for Indications for a new sharp resonance?gnhn: Variation of Partial Wave Amplitude


B. Krusche, MENU 2007 (CB-ELSA/TAPS Coll.) Indications for a new sharp resonance?


Strangeness Production on a Nucleus in a Resonance Model (COSY and HypHI [email protected])

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.


(p,K (COSY and HypHI [email protected])+) Strangeness Production on a Nucleus

R. Shyam, H.L., U. Mosel,Nucl.Phys. A764 (2006) 313


Strangeness and Hypernuclear Physics: (COSY and HypHI [email protected])

From SU(2) Isospin to SU(3) Flavour Dynamics


DDRH Approach: (COSY and HypHI [email protected])ab initio Density Functional Theory

Dirac-Brueckner Calculation

PLB345 (1995), PRC52 (1995), PRC57 (1998), PRC64 (2001), PRC66 (2002), Springer Lect. Not. (2004)


DDRH Hypermatter „Equation of State“ (COSY and HypHI [email protected])

Minimum at 10% L-content: B0=-18MeV at r0=0.21fm-3


DDRH Flavour Dynamics: (COSY and HypHI [email protected])LSingle Particle Energies

Nuclear Matter SL = 28 MeV

DDRH Theory: Density Dependent NN and NL Dirac-Brueckner Vertices


  • 89 (COSY and HypHI [email protected])Y = L + 88Y(4-, g.s.)

  • jj - L Core Interactions

  • Tensor Interaction

DDRH Spectrum for 89Y:


  • LS (COSY and HypHI [email protected])0 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:


Summary and Outlook (COSY and HypHI [email protected])

  • 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


The (COSY and HypHI [email protected])[email protected] & FAIR (T. Saito): Produce Hypernuclei inHeavyIon Collisions

Ni+Ni @ Tlab=3AGeV

T. Gaitanos, H.L.,U. Mosel: GiBUU+Coalescence+SMM


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