Masses of vector bosons in two‐color dense QCD based on the generalized hidden local symmetry

摘要

We study the dependence of "vector" and "axial‐vector" boson masses (mesons and diquark baryons with J~P? = ?1~±) on the baryon density μ_B for two‐color QCD. We show that the baryonic axial‐vector boson has a finite vacuum expectation value (VEV) at the finite μ_B where the U(1)_B symmetry is spontaneously broken. We also find that the VEV causes the mixing between "vector" and "axial‐vector" bosons. As a result of the mixing, our model can reproduce the μ_B dependence of "(axial‐) vector" boson masses shown by the lattice data.