Flavor-mixing induced by the mismatched vector interactions at finite μ_I  

作　　者：张昭 苏海鹏 

机构地区：[1]School of Mathematics and Physics,North China Electric Power University

出　　处：《Nuclear Science and Techniques》2015年第2期135-142,共8页核技术（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.11275069)

摘　　要：The relation between the vector-isoscalar and vector-isovector interactions in the two-flavor Nambu-JonaLasinio(NJL) model is investigated under the different constraints from QCD. We demonstrate that the flavormixing can be induced by the mismatched vector-isoscalar and vector-isovector interactions at finite baryon chemical potential μ and isospin chemical potential μI. The effect of this non-anomaly flavor-mixing on the possible separate chiral transitions at nonzero μIis studied under the assumption of the effective restoration of U(1)Asymmetry. We find that for the weak isospin asymmetry, the two separate phase boundaries found previously can be converted into one only if the vector-isovector coupling gv vis significantly stronger than the vector-isoscalar one gs vwithout the axial anomaly.The relation between the vector-isoscalar and vector-isovector interactions in the two-flavor Nambu-JonaLasinio（NJL） model is investigated under the different constraints from QCD. We demonstrate that the flavormixing can be induced by the mismatched vector-isoscalar and vector-isovector interactions at finite baryon chemical potential μ and isospin chemical potential μI. The effect of this non-anomaly flavor-mixing on the possible separate chiral transitions at nonzero μIis studied under the assumption of the effective restoration of U（1）Asymmetry. We find that for the weak isospin asymmetry, the two separate phase boundaries found previously can be converted into one only if the vector-isovector coupling gv^vis significantly stronger than the vector-isoscalar one gv^s without the axial anomaly.

关 键 词：相互作用 不匹配 味混合 载体 矢量位 化学势 不对称 QCD 

分 类 号：O571[理学—粒子物理与原子核物理]