Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relativistic Transport Approach for Nucleus-Nucleus Collisions from SIS
  to SPS Energies   We formulate a covariant transport approach for high energy nucleus-nucleus
collisions where the real part of the nucleon selfenergies is fitted to nuclear
matter properties which are evaluated on the basis of a NJL-type Lagrangian for
the quark degrees of freedom. The parameters of the quark-model Lagrangian are
fixed by the Gell-Mann, Oakes and Renner relation, the pion- nucleon
$\Sigma$-term, the nucleon energy as well as the nuclear binding energy at
saturation density $\rho_0$. We find the resulting scalar and vector
selfenergies for nucleons to be well in line with either Dirac-Brueckner
computations for $\rho \leq 2 \rho_0$ or those from the phenomenological
optical potential when accounting for a swelling of the nucleon at finite
nuclear matter density. The meson-baryon interaction density is modelled to
describe a decrease of the meson mass with baryon density. The imaginary part
of the hadron selfenergies is determined by a string fragmentation model which
accounts for the in-medium mass of hadrons in line with the 'chiral' dynamics
employed. The applicability of the transport approach is demonstrated in
comparison with experimental data from SIS to SPS energies. The enhancement of
the K$^+/\pi^+$ ratio in A + A collisions compared to p + A reactions at AGS
energies is reproduced within the 'chiral' dynamics. Furthermore, detailed
predictions for the stopping in Pb + Pb collisions at 153 GeV/A are presented.

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The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga