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arXiv 0710.2971hep-phhep-ex
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$K^+ \to e^+ ν_{e}γ$在光前夸克模型和$p^6$阶手征微扰理论中的分析

Analysis of $K^+ \to e^+ ν_{e}γ$ in light-front quark model and chiral perturbation theory of order $p^6$

Chuan-Hung Chen, Chao-Qiang Geng, Chong-Chung Lih

摘要:

在光阵面夸克模型(LFQM)和$O(p^6)$手征微扰理论(ChPT)的框架下,我们重新计算了$K^+ \to γ$跃迁的形状因子.我们使用这些形状因子来研究$K^+ \to e^+ ν_{e}γ$的衰变,这是由结构相关的贡献占主导地位。我们示出了作为$x=2E_γ/m_K$的函数的微分衰变分支比,其中$E_γ$($m_K$)是光子能量(K介子质量)。解释性地发现,在$x=0.01$截断为0.1的标准模型中,$K^+ \to e^+ ν_{e}γ$的衰变分支比在LFQM和ChPT中分别为$1.54 (1.44)\times 10^{-5}$和$1.57 (1.47)\times 10^{-5}$.

英文摘要:

Within the frameworks of the light-front quark model (LFQM) and chiral perturbation theory (ChPT) of $O(p^6)$, we reevaluate the form factors of the $K^+ \to γ$ transition. We use these form factors to study the decay of $K^+ \to e^+ ν_{e}γ$, which is dominated by the structure dependent contribution. We show the differential decay branching ratio as a function of $x=2E_γ/m_K$, where $E_γ$ ($m_K$) is the photon energy (kaon mass). Explicitly, we find that, in the standard model with the cut of $x=0.01$ (0.1), the decay branching ratio of $K^+ \to e^+ ν_{e}γ$ is $1.54 (1.44)\times 10^{-5}$ and $1.57 (1.47)\times 10^{-5}$ in the LFQM and ChPT, respectively.

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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