Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-10-06
Phys.Lett. B433 (1998) 236-242
Physics
Nuclear Physics
Nuclear Theory
12 pages, 3 Postscript figures, LaTeX, elsart, epsfig, minor changes, references added, to be published in Physics Letters B
Scientific paper
10.1016/S0370-2693(98)00639-X
The thermodynamic potential of a system of pions and nucleons is computed including the piN interactions in the P33 channel. A consistent treatment of the width of the resonance in this channel, the Delta(1232) resonance, is explored in detail. In the low-density limit we recover the leading term of the virial expansion for the thermodynamic potential. An instructive diagrammatic interpretation of the contributions to the total baryon number is presented. Furthermore, we examine within a fireball model the consequences for the pion spectra in heavy-ion collisions at intermediate energies, including the effect of collective flow. A consistent treatment of the Delta width leads to a substantial enhancement of the pion yield at low momenta.
Friman Bengt
Nörenberg W.
Weinhold W.
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