KOTO vs. NA62 dark scalar searches
KOTO vs. NA62 dark scalar searches
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DOI：
10.1007/jhep08(2020)110
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发表时间：
2020-05
影响因子：
5.4
通讯作者：
S. Gori;G. Perez;K. Tobioka
中科院分区：
文献类型：
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作者：
S. Gori;G. Perez;K. Tobioka
两个 kaon 工厂 KOTO 和 NA62 位于强度前沿的最前沿，测量和分析了前所未有数量的长寿命和带电 kaons,∼ 10 13。这些实验目前为寻找暗区提供了独特的机会。在本文中，我们证明 KOTO 和 NA62 进行的搜索是互补的，两者都在探索未知领域。我们考虑两种性质不同的物理案例。首先，我们分析与胶子或电弱规范玻色子耦合的类轴子粒子（ALP）模型。在第二部分中，我们引入了一个基于近似奇怪风味对称性的模型，该模型导致严重违反格罗斯曼-尼尔界限。对于第一种情况，我们为 KOTO 实验设计了一种新的搜索策略，KL→ π 0 a→ 4γ。它对分支比的预期灵敏度为 10−9 水平。这表明 KOTO 作为发现机器的巨大潜力。此外，我们重新审视了 Kaon 工厂的 ALP 的其他界限，强调了理论不确定性和对撞机实验的主要来源，并展示了新的预测。对于第二种情况，我们表明该模型可能与 KOTO 数据的初步分析兼容，这为新物理学提供了线索。
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→ π 0 a→ 4γ. 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.