论文标题
结构依赖辐射的分支比率的新确定$ k^{+} \ to e^{+}ν_{e}γ$ decay
New determination of the branching ratio of the structure dependent radiative $K^{+} \to e^{+} ν_{e} γ$ decay
论文作者
论文摘要
The branching ratio of the structure dependent (SD) radiative $K^{+} \to e^{+} ν_{e} γ$ decay relative to that of the $K^+\rightarrow e^+ ν_{e} (γ)$ decay including the internal bremsstrahlung (IB) process ($K_{e2(γ)}$) has been measured in the J-PARC E36使用塑料闪烁体/铅三明治探测器实验。在分析中，在SD辐射衰减中还考虑了Ib的效果为$ k_ {e2γ（γ）}^{\ rm sd} $。通过将新数据与先前报道的E36实验的结果结合使用，在修订后使用CSI（TL）量热计，以$ k_ {e2γ（γ）}^{\ rm sd} $，新值$ br（k_ {k_ {k_ {e2γ（γ（γ（γ）\ rm rm rm rm rm rm rm rm rm rm rm rm rm，已经确定了SD}）/br（k_ {e2（γ））= 1.20 \ pm0.07 $，这与最近的晶格QCD计算是一致的，但大于手性扰动理论（chpt）在$ o（p^4）$和先前的Kloe值的期望。同样，使用该方法将Kloe论文中描述的外形率和分支比率相关联，目前的结果与基于测量的非局部性手性夸克模型的表单要素预测一致，但在$ o（p^6）$上的chpt大于chpt。
The branching ratio of the structure dependent (SD) radiative $K^{+} \to e^{+} ν_{e} γ$ decay relative to that of the $K^+\rightarrow e^+ ν_{e} (γ)$ decay including the internal bremsstrahlung (IB) process ($K_{e2(γ)}$) has been measured in the J-PARC E36 experiment using plastic scintillator/lead sandwich detectors. In the analysis, the effect of IB was also taken into account in the SD radiative decay as $K_{e2γ(γ)}^{\rm SD}$. By combining the new data with the previously reported result of the E36 experiment using a CsI(Tl) calorimeter after revision for the IB correction for $K_{e2γ(γ)}^{\rm SD}$, a new value $Br(K_{e2γ(γ)}^{\rm SD})/Br(K_{e2(γ)})=1.20\pm0.07$ has been determined, which is consistent with a recent lattice QCD calculation, but larger than the expectation of Chiral Perturbation Theory (ChPT) at order $O(p^4)$ and the previous KLOE value. Also, using the method to relate form factor and branching ratio described in the KLOE paper, the present result is consistent with the form factor prediction based on a gauged nonlocal chiral quark model, but larger than ChPT at order $O(p^6)$.
