论文标题
Miniboone的祭坛鸡尾酒的更多成分
More Ingredients for an Altarelli Cocktail at MiniBooNE
论文作者
论文摘要
小型过量持续存在，这是粒子物理学中的重要难题。鉴于迷你酮检测器无法区分由于光子而导致的电子信号和背景，因此这项工作的目的是在深度研究小木酮的光子背景。我们首先考虑一种新型的单光子背景，该背景是由多核子散射引起的，并具有相干增强的初始状态辐射或最终状态辐射。我们认为这类流程“ 2p2h $γ$”（两粒子 - 两孔 +光子）可以解释$ {\ sim} 40 $的$ {\ sim} 560 $的多余事件，而Miniboone在Neutrino模式下观察到了多余的事件。其次，我们考虑中性单电流单$π^0 $产生的背景，其中两个光子从$π^0 \toγγ$衰减被错误地识别为电子样淋浴。我们构建了一种现象学的可能性，该可能重现MiniBoone的$π^0 \toγγ$背景。即使使用数据驱动的背景估计技术，我们也会发现对所使用的蒙特卡洛发生器有残留依赖性。我们的结果激发了将迷你酮过量的重要性减少$0.4σ$。
The MiniBooNE excess persists as a significant puzzle in particle physics. Given that the MiniBooNE detector cannot discriminate between electron-like signals and backgrounds due to photons, the goal of this work is to study photon backgrounds in MiniBooNE in depth. We first consider a novel single-photon background arising from multi-nucleon scattering with coherently enhanced initial or final state radiation. This class of processes, which we dub "2p2h$γ$" (two-particle--two-hole + photon) can explain ${\sim}40$ of the ${\sim}560$ excess events observed by MiniBooNE in neutrino mode. Second, we consider the background from neutral-current single-$π^0$ production, where two photons from $π^0\toγγ$ decay are mis-identified as an electron-like shower. We construct a phenomenological likelihood that reproduces MiniBooNE's $π^0\toγγ$ background faithfully. Even with data-driven background estimation techniques, we find there is a residual dependence on the Monte Carlo generator used. Our results motivate a reduction in the significance of the MiniBooNE excess by $0.4σ$.
