标题： 背景抑制对于带有极化缪子的$μ\to eγ$的研究 显示英文标题

标题： Background Suppression for $μ\to eγ$ with Polarized Muons

摘要： 使用极化μ子搜索轻子味违反的$\mu^{+}\rightarrow e^{+}\gamma$衰变，重新审视了由于正常μ子衰变中的$e^{+}$与辐射μ子衰变中的高能光子之间的偶然巧合产生的严重背景的抑制，$\mu^{+} \rightarrow e^{+} \nu \overline{\nu} \gamma$。 发现高能光子在$\mu^{+} \rightarrow e^{+} \nu \overline{\nu} \gamma$衰变中倾向于沿着μ子自旋方向发射，类似于正常μ子衰变中的$e^{+}$。 对 either $e^{+}$s 或与缪子自旋方向反平行运动的光子进行选择性测量，将分别抑制具有右旋和左旋 $e^{+}$s 的 $\mu^{+} \rightarrow e^{+} \gamma$ 的偶然背景。 显示英文摘要

摘要： A search for the lepton-flavor violating $\mu^{+}\rightarrow e^{+}\gamma$ decay using polarized muons is revisited in terms of suppression of the serious background arising from an accidental coincidence between a $e^{+}$ in the normal muon decay and a high energy photon in the radiative muon decay, $\mu^{+} \rightarrow e^{+} \nu \overline{\nu} \gamma$. It is found that a high energy photon in $\mu^{+} \rightarrow e^{+} \nu \overline{\nu} \gamma$ decay is preferentially emitted parallel to the muon spin direction, similarly to $e^{+}$ in the normal muon decay. The selective measurements of either $e^{+}$s or photons moving antiparallel to the muon spin direction would suppress the accidental background for $\mu^{+} \rightarrow e^{+} \gamma$ with right-handed and left-handed $e^{+}$s respectively.