%0 Journal Article %T Quark-antiquark Scattering Phase Shift and Meson Spectral Function in Pion Superfluid %A Tao Xia %A Pengfei Zhuang %J Physics %D 2014 %I arXiv %X We study the quark-antiquark scattering phase shift and meson spectral function in the pion superfluid described by the Nambu--Jona-Lasinio model. The meson mixing in the pion superfluid changes dramatically the full scattering phase shift and spreads strongly the spectral function of some of the collective modes. %U http://arxiv.org/abs/1411.6713v1