标题： 柴郡猫袋模型：颜色异常与 $η'$ 性质 显示英文标题

标题： The Cheshire Cat Bag Model: Color Anomaly and $η'$ Properties

摘要： 我们证明，如果允许赝标纯量同位旋单态 ($\eta'$) 在表面耦合，则颜色可以从一个QCD袋泄漏出来。为了强制实现颜色的完全限制，建议增加一个边界项。推导了$\eta'$的质量与衰变常数和QCD胶子凝聚之间的新关系，并将其与经验参数进行了比较。 显示英文摘要

摘要： We show that color can leak from a QCD bag if we allow for pseudoscalar isoscalar singlet ($\eta'$) coupling at the surface. To enforce total confinement of color an additional boundary term is suggested. New relations between the $\eta'$ mass and decay constant and the QCD gluon condensates are derived and compared with the empirical parameters.