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arXiv 0810.1217hep-ph
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阿贝尔轴反常与$η-η'$混合的色散方法

Dispersive Approach to Abelian Axial Anomaly and $η-η'$ Mixing

Y. N. Klopot, A. G. Oganesian, O. V. Teryaev

摘要:

我们研究了通过轴向异常的色散表示可以了解$η$ - $η'$混合的情况。我们表明,我们的方法导致强界的$η-η'$混合角:$θ= -15.3^o \pm 1^o$。此外,我们的结果还表明了宽度$Γ_{η\to 2γ}$对混合角$θ$的显著依赖性。这个性质解释了相对较小的混合如何强烈影响衰变宽度。

英文摘要:

We investigate what can be learnt about the $η$ -$η'$ mixing by means of dispersive representation of axial anomaly. We show that our method leads to the strong bounds for the $η-η'$ mixing angle: $θ= -15.3^o \pm 1^o$. Moreover, our result manifests also a dramatic dependence of the width $Γ_{η\to 2γ}$ on the mixing angle $θ$. This property explains how the relatively small mixing strongly effects the decay width.

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