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arXiv 1102.3119hep-thhep-ph
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朗道规范中横胶子或夸克产生的非微扰BRST四重态

The non-perturbative BRST quartets generated by transverse gluons or quarks in Landau gauge

Natalia Alkofer, Reinhard Alkofer

摘要:

简要介绍了BRST四重态机制。特别强调的是微扰与非微扰四重奏的区别。本文给出了朗道规范中横胶子或夸克产生的非微扰BRST四重态的场含量。相应的截断Bethe-Salpeter方程为各自的第一个女儿和第二个母态。讨论了在何种意义上这些方程提供了证据的存在的束缚态作为子态的非微扰BRST四重态。注意到在泛函方法的标度解中,夸克胶子顶点的红外发散恰好是使相应的Bethe-Salpeter方程红外相容的正确发散。

英文摘要:

The BRST quartet mechanism is briefly reviewed. A special emphasis is given to the distinction of perturbative versus non-perturbative quartets. The field contents of the non-perturbative BRST quartets generated by transverse gluons or quarks in Landau gauge are presented. Corresponding truncated Bethe-Salpeter equations for the respective first daughter and second parent states are derived. It is discussed in which sense these equations provide evidence for the existence of bound states as daughter states in non-perturbative BRST quartets. It is noted that within the scaling solution of functional approaches the infrared divergence of the quark-gluon vertex is exactly the right one tomake the respective Bethe-Salpeter equation infrared consistent.

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