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Multi-instanton contributions to anomalous quark interactions

机译:对异常夸克互动的多算法贡献

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In quantum chromodynamics (QCD), the role which topologically nontrivial configurations play in splitting the singlet pseudo-Goldstone meson, the η ′ , from the octet is familiar. In addition, such configurations contribute to other processes which violate the axial U ( 1 ) A symmetry. While the nature of topological fluctuations in the vacuum is still unsettled, at temperatures above that for the chiral phase transition, they can be described by a dilute gas of instantons. We show that instantons of arbitrary topological charge Q generate anomalous interactions between 2 N f | Q | quarks, which for Q = 1 make the η ′ heavy. For two flavors we compute an anomalous quartic meson coupling and discuss its implications for the phenomenology of the chiral phase transition. A dilute instanton gas suggests that for cold, dense quarks, instantons do not evaporate until very high densities, when the baryon chemical potential is ? 2 ? ? GeV .
机译:在量子色力动力学(QCD)中,拓扑非血管配置在分裂单向伪金石中,η'的角色熟悉。 另外,这种配置有助于违反轴向U(1)对称的其他过程。 虽然真空中拓扑波动的性质仍然仍然不沉浸,但在高于手性相转变的温度下,它们可以通过稀释的液中的稀释气体来描述它们。 我们表明任意拓扑电荷Q的方案产生2n F之间的异常相互作用 Q | Quarks,用于Q = 1使η'重。 对于两种口味,我们计算了异常的四分之一的中思偶联,并讨论其对手性相转变的现象学的影响。 稀释的instanton天然气表明,对于寒冷,致密的夸克,即时不会蒸发直至非常高的密度,当Baryon化学潜力是? 2? 还 GEV。

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