THE PION PROPAGATOR IN THE WALECKA MODEL WITH THE DELTA BARYON

被引：34

作者：

HERBERT, T ^{[1
]}

WEHRBERGER, K ^{[1
]}

BECK, F ^{[1
]}

机构：

[1] TH DARMSTADT,INST KERNPHYS,SCHLOSSGARTENSTR 9,W-6100 DARMSTADT,GERMANY

来源：

NUCLEAR PHYSICS A | 1992年 / 541卷 / 04期

关键词：

D O I：

10.1016/0375-9474(92)90229-D

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We evaluate the pion propagator in nuclear matter within the Walecka model, extended to include pions and the DELTA-baryon. Both particle-hole and delta-hole contributions are taken into account in random-phase approximation. While ph excitation is suppressed by the smaller nucleon effective mass in nuclear matter, DELTA-h excitation is almost unaffected by the effective nucleon and delta masses. The resulting pion condensate can be removed by the standard Landau-Migdal parameter g'. We also find a strong dependence of our results on the DELTA-off-shell parameter.

引用

页码：699 / 713

页数：15

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