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arXiv 2106.12482hep-phnucl-exnucl-th
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大$N_c$手征微扰理论中的$η^{(')}\toπ^+π^-γ^{(\ast)}$

$η^{(')}\toπ^+π^-γ^{(\ast)}$ in large-$N_c$ chiral perturbation theory

Patricia Bickert, Stefan Scherer

摘要:

本文在大$N_c$手征微扰理论中,计算了单圈水平下的$η^{(')}\toπ^+π^-γ^{(\ast)}$衰变过程,包括次-次-主导阶(NNLO).在LO,NLO和NNLO连续进行数值评估的结果,拟合相关的低能量常数可用的实验数据。我们讨论了$η^{(')}\toπ^+π^-γ$和$η^{(')}\toπ^+π^-l^+l^-$的宽度和衰变谱,以及$l=e,\ μ$。

英文摘要:

We present a calculation of the decays $η^{(')}\toπ^+π^-γ^{(\ast)}$ at the one-loop level up to and including next-to-next-to-leading order (NNLO) in large-$N_c$ chiral perturbation theory. The numerical evaluation of the results is performed successively at LO, NLO, and NNLO, fitting the relevant low-energy constants to the available experimental data. We discuss the widths and decay spectra of $η^{(')}\toπ^+π^-γ$ as well as $η^{(')}\toπ^+π^-l^+l^-$, with $l=e,\ μ$.

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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