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INFN Sezione di Trieste, I-34127 Trieste.
The Graduate University for Advanced Studies (SOKENDAI), Hayama 240-0193.
Phys Rev Lett. 2020 Oct 16;125(16):161806. doi: 10.1103/PhysRevLett.125.161806.
We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e^{+}e^{-}→γa, a→γγ in the mass range 0.2<m_{a}<9.7 GeV/c^{2} using data corresponding to an integrated luminosity of (445±3) pb^{-1}. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength g_{aγγ} of ALPs to photons at the level of 10^{-3} GeV^{-1}. The limits are the most restrictive to date for 0.2<m_{a}<1 GeV/c^{2}.
我们利用超级KEKB对撞机上的 Belle II 探测器，开展了一项寻找轻赝标量粒子 a 直接衰变为两个光子的研究。我们在质量范围 0.2 < mₐ < 9.7 GeV/c² 内，使用对应积分亮度为(445±3) pb⁻¹的数据，寻找过程 e⁺e⁻→γa，a→γγ。在标准模型的扩展理论中，经常假定主要与标准模型规范玻色子相互作用的轻赝标量粒子（所谓的类轴子粒子或 ALP）。我们没有发现 ALP 的证据，并在 10⁻³ GeV⁻¹ 的水平上，对 ALP 与光子的耦合强度 gₐγγ 设置了 95%置信水平的上限。对于 0.2 < mₐ < 1 GeV/c²，这些限制是迄今为止最严格的。
