论文标题
Koto vs. NA62黑暗标量搜索
KOTO vs. NA62 Dark Scalar Searches
论文作者
论文摘要
KAON工厂Koto和Na62处于强度边界的最前沿，并进行了〜10^{13}的前所未有的长期数量，正在测量和分析。这些实验目前有一个独特的机会来寻找黑暗领域。在本文中，我们证明了在Koto和Na62进行的搜索是互补的，都探测了未知领域。我们考虑两个质性不同的物理案例。首先，我们分析了轴突样粒子（ALP）的模型，这些模型将夫妇粘在胶子或电子仪表孔玻色子上。在第二个中，我们介绍了一个基于近似奇怪的风味对称性的模型，该模型导致对Grossman-Nir结合的强烈侵犯。对于第一种情况，我们为Koto实验设计了一个新的搜索策略，K_L-> pi^0 A-> 4 Gamma。它对分支比率的预期灵敏度为10^{ - 9}的水平。这证明了Koto作为发现机的巨大潜力。此外，我们重新审视了Kaon工厂的阿尔卑斯山的其他范围，强调了理论不确定性的主要来源和对撞机实验，并显示了新的预测。在第二种情况下，我们表明该模型可能与Koto-Data的初步分析兼容，该分析显示了新物理学的提示。
The two kaon factories, KOTO and NA62, are at the cutting edge of the intensity frontier, with an unprecedented numbers of long lived and charged Kaons, ~ 10^{13}, being measured and analyzed. These experiments have currently a unique opportunity to search for dark sectors. In this paper, we demonstrate that searches done at KOTO and NA62 are complementary, both probing uncharted territories. We consider two qualitatively different physics cases. In the first, we analyze models of axion-like-particles (ALP) which couple to gluons or electroweak gauge bosons. In the second, we introduce a model based on an approximate strange flavor symmetry that leads to a strong violation of the Grossman-Nir bound. For the first scenario, we design a new search strategy for the KOTO experiment, K_L -> pi^0 a -> 4 gamma . Its expected sensitivity on the branching ratio is at the level of 10^{-9}. This demonstrates the great potential of KOTO as a discovery machine. In addition, we revisit other bounds on ALPs from Kaon factories, highlighting the main sources of theoretical uncertainty, and collider experiments, and show new projections. For the second scenario, we show that the model may be compatible with the preliminary analysis of the KOTO-data that shows a hint for New Physics.
