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arXiv 1201.2135hep-phhep-exnucl-th
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从辐射衰变过程研究η-η'混合

Study of η-η' mixing from radiative decay processes

Yun-Hua Chen, Zhi-Hui Guo, Han-Qing Zheng

摘要:

本文对共振手征理论中的VPγ(γ*)和Pγγ(γ*)衰变进行了深入的分析,其中V代表矢量共振ρ,K*,ω,π,P代表π,K,η,η',γ* 随后衰变为轻子对。在对共振耦合施加QCD短程约束后,ω-> πγ(γ*),ρ-> πγ(γ*),K^{*0} -> K^0γ过程只依赖于一个自由参数,π-> γγ(γ*)可以完全预言。η-η'系统的四个混合参数,即两个混合角\theta δ、\theta θ和两个衰变常数F8、F0,由涉及η或η'的辐射衰变确定。通过对重共振的积分,预测了手征反常区赝Goldstone拉格朗日量的高阶低能常数。我们还预测了ρ-> πe^+ e^-,η' -> γe^+ e^-和γ-> ημ^+ μ^-的衰变宽度,这些结果可以与将来在这些通道中的测量结果进行比较。

英文摘要:

We perform a thorough analysis of the VPγ(γ*) and Pγγ(γ*) decays in the resonance chiral theory, where V stand for the vector resonances ρ, K*, ω, ϕ, P stand for π, K, η, η' and γ* subsequently decays into lepton pairs. Upon imposing QCD short-distance constraints on resonance couplings, the ω-> πγ(γ*), ρ-> πγ(γ*), K^{*0} -> K^0γprocesses only depend on one free parameter and π-> γγ(γ*) can be completely predicted. The four mixing parameters of the η-η' system, i.e. two mixing angles \theta8, \theta0 and two decay constants F8, F0, are determined from radiative decays involving ηor η'. The higher order low energy constants of the pseudo-Goldstone Lagrangian in the chiral anomaly sector are predicted by integrating out heavy resonances. We also predict the decay widths of ρ-> πe^+ e^-, η' -> γe^+ e^- and ϕ-> ημ^+ μ^-, which can be compared with the future measurement in these channels.

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。

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