双色重子丰介质中的强子谱
Hadron Spectrum in a Two-Colour Baryon-Rich Medium
摘要：
在8^3 × 16格点上，利用全对全传播子研究了具有两种Wilson夸克味的SU（2）格点规范理论的强子谱，着重研究了强子谱对夸克化学势μ的依赖性.当μ从0增加时，具有非零重子数B的双夸克态如预期那样响应，而B=0的态保持不受影响，直到在μ =m_pi/2处非零重子密度开始。发病后的π介子质量增加，根据手征微扰理论，而ρ变得更轻。在双夸克扇区中，可以识别出与超流基态相关的Goldstone态。超流性的另一个结果是具有相同时空和同位旋量子数的介子和重子之间的近似简并。最后，我们找到了在重子介质中态与K介子量子数结合的初步证据。
英文摘要：
The hadron spectrum of SU(2) lattice gauge theory with two flavours of Wilson quark is studied on an 8^3x16 lattice using all-to-all propagators, with particular emphasis on the dependence on quark chemical potential mu. As mu is increased from zero the diquark states with non-zero baryon number B respond as expected, while states with B=0 remain unaffected until the onset of non-zero baryon density at mu=m_pi/2. Post onset the pi-meson mass increases in accordance with chiral perturbation theory while the rho becomes lighter. In the diquark sector a Goldstone state associated with a superfluid ground state can be identified. A further consequence of superfluidity is an approximate degeneracy between mesons and baryons with the same spacetime and isospin quantum numbers. Finally we find tentative evidence for the binding of states with kaon quantum numbers within the baryonic medium.
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