Phi meson mass and decay width in nuclear matter
Phi meson mass and decay width in nuclear matter
复制标题
核物质中的 Phi 介子质量和衰变宽度
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. V. Vacas
中科院分区：
文献类型：
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作者：
D. Cabrera;M. V. Vacas
在真空中以与$\bar{K} K$系统耦合为主的$\phi$介子谱在核物质中得到了修正。根据一个基于手性SU(3)动力学的模型，我们计算了核物质中介子自能$\phi$，考虑了$K$和$\bar{K}$的介质性质。对于后者，我们使用先前的计算结果，该结果考虑了基于最低阶介子-重子手性有效拉格朗日量的$S-$和$P-$波介子-核子相互作用，这导致介质中介子传播子的处理。此外，评估了一组顶点修正以实现规范不变性，其中涉及$\phi$介子与$S-$波和$P-$波的介子-重子顶点的接触耦合。在此方案下，研究了核物质中$\phi$介子的质量位移和衰变宽度。
The $\phi$ meson spectrum, which in vacuum is dominated by its coupling to the $\bar{K} K$ system, is modified in nuclear matter. Following a model based on chiral SU(3) dynamics we calculate the $\phi$ meson selfenergy in nuclear matter considering the $K$ and $\bar{K}$ in-medium properties. For the latter we use the results of previous calculations which account for $S-$ and $P-$wave kaon-nucleon interactions based on the lowest order meson-baryon chiral effective Lagrangian, and this leads to a dressing of the kaon propagators in the medium. In addition, a set of vertex corrections is evaluated to fulfill gauge invariance, which involves contact couplings of the $\phi$ meson to $S-$wave and $P-$wave kaon-baryon vertices. Within this scheme the mass shift and decay width of the $\phi$ meson in nuclear matter are studied.