Strangeness Production on the Nucleon and on Nuclei
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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

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


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

The Giessen Model: Coupled Channels K-Matrix

  • WidthsGN* are generated dynamically

  • Unitarity because of K=K+,

  • Resonances and background within the same approach!


Strangeness production on the nucleon and on nuclei

Tree-Level Diagrams in the BS Equation


Strangeness production on the nucleon and on nuclei

Meson Production on the Nucleon


Strangeness production on the nucleon and on nuclei

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)


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

Predicted CC-Results for eta-Production on the Neutron

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


Strangeness production on the nucleon and on nuclei

Predictions for gnhn: Variation of Partial Wave Amplitude


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

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.


Strangeness production on the nucleon and on nuclei

(p,K+) Strangeness Production on a Nucleus

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


Strangeness production on the nucleon and on nuclei

Strangeness and Hypernuclear Physics:

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


Strangeness production on the nucleon and on nuclei

DDRH Approach: ab initio Density Functional Theory

Dirac-Brueckner Calculation

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


Strangeness production on the nucleon and on nuclei

DDRH Hypermatter „Equation of State“

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


Strangeness production on the nucleon and on nuclei

DDRH Flavour Dynamics:LSingle Particle Energies

Nuclear Matter SL = 28 MeV

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


Strangeness production on the nucleon and on nuclei

  • 89Y = L + 88Y(4-, g.s.)

  • jj - L Core Interactions

  • Tensor Interaction

DDRH Spectrum for 89Y:


Strangeness production on the nucleon and on nuclei

  • 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:


Strangeness production on the nucleon and on nuclei

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


Strangeness production on the nucleon and on nuclei

[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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