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arXiv 1601.03086hep-phhep-th
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来自混合和振荡的轻子不对称性

Lepton asymmetry from mixing and oscillations

Alexander Kartavtsev, Peter Millington, Hendrik Vogel

摘要:

我们展示了两个物理上不同的来源CP不对称相关的场景leptogenesis:(i)共振混合和(ii)不同的味道之间的振荡可以明确地确定在Kadanoff-Baym形式主义。通过分析非平衡传播子的谱结构,而不依赖于粒子数密度的定义,这些贡献被隔离。混合源与通常的质量壳层相关联,而振荡源与第三中间壳层相关联。此外,我们确定躺在振荡壳,可以解释为混合和振荡之间的相消干涉的条款。我们确认,相同的壳结构中获得的海森堡和相互作用的图片实现的Kadanoff-Baym形式主义。在这样做,我们说明了这两种方法的自洽性和互补性。特别是相互作用图片的方法具有的优点是,它可以用来分析所有形式的质谱从准简并通过分级。

英文摘要:

We show how the two physically-distinct sources of CP-asymmetry relevant to scenarios of leptogenesis: (i) resonant mixing and (ii) oscillations between different flavours can be unambiguously identified within the Kadanoff-Baym formalism. These contributions are isolated by analyzing the spectral structure of the non-equilibrium propagators without relying on the definition of particle number densities. The mixing source is associated with the usual mass shells, whereas the oscillation source is identified with a third intermediate shell. In addition, we identify terms lying on the oscillation shell that can be interpreted as the destructive interference between mixing and oscillation. We confirm that identical shell structure is obtained in both the Heisenberg- and interaction-picture realizations of the Kadanoff-Baym formalism. In so doing, we illustrate the self-consistency and complementarity of these two approaches. The interaction-picture approach in particular has the advantage that it may be used to analyze all forms of mass spectra from quasi-degenerate through to hierarchical.

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