论文标题
微酮的轴突样颗粒上的新边界
New bounds on axion-like particles from MicroBooNE
论文作者
论文摘要
中微子实验位于强度边界的边缘，因此可以利用以搜索与可见扇区弱耦合的新光颗粒。在这项工作中，我们使用Microboone实验中的数据对轴突样颗粒（ALP）得出了新的约束，这是从搜索$ e^+ e^ - $对指向NUMI吸收器方向的搜索。特别是，我们考虑添加高维有效的操作员，将ALP耦合到Electroweak仪表玻色子。这些将在Numi吸收器中的静止衰减中诱导$ k \ toπa$，以及ALP腐烂成对成对的瘦素或光子。我们详细讨论并比较了先前文献中为衰减宽度$ k \rightarrowπa$获得的各种结果。对于涉及HIGGS的操作员，微酮已经设定了100至200 MeV之间的ALP质量的竞争界限（与NA62的竞争界限（与Na62的界限相当）。我们还从微酮记录的完整NUMI数据集中计算了预期的灵敏度。我们的结果表明，搜索$ a \toγγ$信号的搜索可能能够改善从涉及ALP耦合到$ W $的操作员上的Beam-Dump实验的当前限制。
Neutrino experiments lie at the edge of the intensity frontier and therefore can be exploited to search for new light particles weakly coupled to the visible sector. In this work we derive new constraints on axion-like particles (ALPs) using data from the MicroBooNE experiment, from a search for $e^+ e^-$ pairs pointing in the direction of the NuMI absorber. In particular, we consider the addition of higher-dimensional effective operators coupling the ALP to the electroweak gauge bosons. These would induce $K\to πa$ from kaon decay at rest in the NuMI absorber, as well as ALP decays into pairs of leptons or photons. We discuss in detail and compare various results obtained for the decay width $K\rightarrow πa$ in previous literature. For the operator involving the Higgs, MicroBooNE already sets competitive bounds (comparable to those of NA62) for ALP masses between 100 and 200 MeV. We also compute the expected sensitivities from the full NuMI dataset recorded at MicroBooNE. Our results show that a search for a $a\toγγ$ signal may be able to improve over current constraints from beam-dump experiments on the operator involving the ALP coupling to the $W$.
