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Antikaon production in A+A collisions at SIS energies within an off-shell G-matrix approach | | W. Cassing
; L. Tolos
; E. L. Bratkovskaya
; A. Ramos
; | | Date: |
2 Apr 2003 | | Journal: | Nucl.Phys. A727 (2003) 59-94 | | Subject: | nucl-th | | Affiliation: | Univ. Giessen), L. Tolos (Univ. Barcelona), E. L. Bratkovskaya (Univ. Frankfurt), A. Ramos (Univ. Barcelona | | Abstract: | The production and propagation of antikaons -- described by dynamical spectral functions $A_h(X,vec{P},M^2)$ as evaluated from a coupled channel $G$-matrix approach -- is studied for nucleus-nucleus collisions at SIS energies in comparison to the conventional quasi-particle limit and the available experimental data using off-shell transport theory. We find that the $K^-$ spectra for $^{12}C + ^{12}C$ and $^{58}Ni + ^{58}Ni$ at 1.8 A$cdot$GeV remain underestimated in the $G$-matrix approach as in the on-shell quasi-particle approximation whereas the preliminary spectra for $Au + Au$ at 1.5 A$cdot$GeV are well described in both limits. This also holds approximately for the $K^-$ rapidity distributions in semi-central collisions of $Ni+Ni$ at 1.93 A$cdot$GeV. However, in all limits considered there is no convincing description of all spectra simultaneously. Our off-shell transport calculations, furthermore, demonstrate that the strongest in-medium effects should be found for low antikaon momenta in the center-of-mass frame, since the deceleration of the antikaons in the attractive Coulomb and nuclear potentials and the propagation to the on-shell mass induces a net shift and squeezing of the $K^-$ spectra to the low momentum regime. | | Source: | arXiv, nucl-th/0304006 | | Services: | Forum | Review | PDF | Favorites | |
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