Chemical potential response of pseudoscalar meson masses in the Nambu-Jona-Lasinio model

被引:2
作者
Miyamura, O [1 ]
Choe, S [1 ]
机构
[1] Hiroshima Univ, Dept Phys, Higashihiroshima 7398526, Japan
基金
日本学术振兴会;
关键词
D O I
10.1016/S0920-5632(01)01751-0
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Using the Nambu-Jona-Lasinio (NJL) model we study chemical potential response of the pion and kaon masses as a function of temperature and chemical potential, i.e., partial derivativem/partial derivativemu (T, mu). First, we obtain the responses assuming the vector-axial vector coupling is zero (gv=0). Then, we include a non-zero gv and study the effects of gv on the responses. We find that the behavior of a for the pion is quite different froth that for the kaon. It means that partial derivativem/partial derivativemu is much dependent on the mass difference between the two quarks, i.e., the a and s quarks (or even between the a and d quarks). Our results may give a clue to future studies of partial derivativem/partial derivativemu on the lattice.
引用
收藏
页码:474 / 476
页数:3
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