$ k^+ \rightarrowπ^{0} e^{+}νγ$ decay oka设置的研究

论文标题

$ k^+ \rightarrowπ^{0} e^{+}νγ$ decay oka设置的研究

Study of $K^+ \rightarrow π^{0} e^{+} νγ$ decay with OKA setup

论文作者

Polyarush, A. Yu., Duk, V. A., Filippov, S. N., Guschin, E. N., Khudyakov, A. A., Kravtsov, V. I., Kudenko, Yu. G., Akimenko, S. A., Artamonov, A. V., Blik, A. M., Burtovoy, V. S., Donskov, S. V., Filin, A. P., Inyakin, A. V., Gorin, A. M., Khaustov, G. V., Kholodenko, S. A., Kolosov, V. N., Kurshetsov, V. F., Lishin, V. A., Medynsky, M. V., Mikhailov, Yu. V., Obraztsov, V. F., Polyakov, V. A., Romanovsky, V. I., Rykalin, V. I., Sadovsky, A. S., Samoilenko, V. D., Shapkin, M. M., Stenyakin, O. V., Tchikilev, O. G., Uvarov, V. A., Yushchenko, O. P., Bychkov, V. N., Kekelidze, G. D., Lysan, V. M., Zalikhanov, B. Zh.

论文摘要

出现了对$ k^+ \rightarrowπ^{0} e^{+}νγ$衰减的研究结果。观察到了32000多个事件。提出了光子能量上的差分光谱和KAON休息框中的光子电子开头。标准化为$ k_ {e3} $衰减的分支比率是针对$ e^*_γ$和$cosθ^{*} _ {eγ} $的不同切割计算的。特别是，$ e^{*}_γ> 30 $ meV和$θ^{*} _ {eγ}> 20^{\ circ} $的分支比率是r = $ \ frac { π^{0} e^{+}ν_{e}）} $ = =（0.587 $ \ pm $ 0.010（$stat。$）$ \ pm $ \ pm $ 0.015（$ syst。$）$ \ times10^{ - 2} $，与Chpt $ O（p^{4}）相当良好。

Results of a study of the $K^+ \rightarrow π^{0} e^{+} νγ$ decay at OKA setup are presented. More than 32000 events of this decay are observed. The differential spectra over the photon energy and the photon-electron opening angle in kaon rest frame are presented. The branching ratios, normalized to that of $K_{e3}$ decay are calculated for different cuts in $E^*_γ$ and $cosΘ^{*}_{eγ}$. In particular, the branching ratio for $E^{*}_γ>30$ MeV and $Θ^{*}_{e γ}>20^{\circ}$ is measured R = $\frac{Br(K^+ \rightarrow π^{0} e^{+} ν_{e} γ) } {Br(K^+ \rightarrow π^{0} e^{+} ν_{e})} $ = =(0.587$\pm$0.010($stat.$)$\pm$0.015($syst.$))$\times10^{-2}$, which is in a good agreement with ChPT $O(p^{4})$ calculations.

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