arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.06324hep-ph
收藏

夸克交换过程的四夸克充分QCD求和规则

Tetraquark-adequate QCD sum rules for quark-exchange processes

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian

摘要:

我们考虑夸克-强子对偶关系和QCD求和规则涉及异国情调的四夸克流,这里专门的情况下,夸克交换过程。我们指出的差异,他们表现出的情况下,涉及普通的双线性夸克流。基于只有至少具有四夸克奇点的图才能对四夸克态的形成有贡献的观察,我们证明了夸克-强子对偶关系和相应的求和规则分裂成两个不重叠的关系.最终的四夸克适当QCD求和规则只涉及这些关系之一,其中算子乘积展开从$O(α_s^2)$阶图开始。

英文摘要:

We consider quark-hadron duality relations and QCD sum rules for correlators involving exotic tetraquark currents, here specializing to the case of quark-exchange processes. We point out the differences they exhibit with respect to the cases involving ordinary bilinear quark currents. Based on the observation that only diagrams possessing at least four-quark singularities can contribute to the formation of tetraquark states, we show that the quark-hadron duality relations and the corresponding sum rules split into two non-overlapping relations. The ultimate tetraquark-adequate QCD sum rule is concerned only with one of these relations, in which the operator product expansion starts with diagrams of order $O(α_s^2)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑