共振的Feynman-Hellmann定理和对QCD奇异性的探索
Feynman-Hellmann theorem for resonances and the quest for QCD exotica
摘要：
推广了量子场论中共振态的Feynman-Hellmann定理。在这个定理的基础上，提出了一个判据来研究QCD中某些强子态的奇异性。结果表明，这一建议是支持显式计算手征微扰理论和大- $N_c$参数。分析最近的晶格数据的夸克质量依赖的赝标量，矢量介子，重子八重态和重子十重态部门，我们得出结论，正如预期的那样，这些主要是夸克模型状态，尽管修正是不可忽略的。
英文摘要：
The generalization of the Feynman-Hellmann theorem for resonance states in quantum field theory is derived. On the basis of this theorem, a criterion is proposed to study the possible exotic nature of certain hadronic states emerging in QCD. It is shown that this proposal is supported by explicit calculations in Chiral Perturbation Theory and by large-$N_c$ arguments. Analyzing recent lattice data on the quark mass dependence in the pseudoscalar, vector meson, baryon octet and baryon decuplet sectors, we conclude that, as expected, these are predominately quark-model states, albeit the corrections are non-negligible.
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