论文标题
与来自球状簇的重轴状粒子的光子相连的限制
Constraints on the coupling with photons of heavy axion-like-particles from Globular Clusters
论文作者
论文摘要
我们更新与光子相互作用的轴颗粒（$ m_a $最高为100 keV）的球状簇（$ m_a $）。恒星核中这种颗粒的产生由Primakoff $γ+Ze \ to Ze+A $和光子合并过程$γ+γ\到$。以前的估计中未包括后者，主要是高质量。此外，我们解释了恒星核心内部的轴衰变的可能性，这是我们在这里考虑的质量和群体中不可忽略的效果。因此，我们的结果对先前的约束进行了重大修改，尤其是对于$ m_a \ gtrsim 50 $ kev。球状簇星，SN 1987a和Beam-Dump实验的组合约束在参数空间中留下一个小的三角形区域，$ m_a \ sim \ sim 0.5-1 \，$ meV和$ g_ {aγ}} \ sim 10^{ - 5} { - 5} $ gev $ gev $^$^{ - 1} $。这是非正式地称为ALP“宇宙三角”，因为它只能使用标准宇宙学论证将其排除在外。但是，正如我们将提到的，有一些可行的宇宙学模型与该区域中具有参数的轴突样颗粒兼容。我们还讨论了在即将进行的加速器实验中实验探索宇宙三角的可能性。
We update the globular cluster bound on massive ($m_a$ up to a few 100 keV) axion-like particles (ALP) interacting with photons. The production of such particles in the stellar core is dominated by the Primakoff $γ+ Ze\to Ze +a$ and by the photon coalescence process $γ+γ\to a$. The latter, which is predominant at high masses, was not included in previous estimations. Furthermore, we account for the possibility that axions decay inside the stellar core, a non-negligible effect at the masses and couplings we are considering here. Consequently, our result modifies considerably the previous constraint, especially for $m_a \gtrsim 50$ keV. The combined constraints from Globular Cluster stars, SN 1987A, and beam-dump experiments leave a small triangularly shaped region open in the parameter space around $m_a \sim 0.5-1\,$ MeV and $g_{aγ} \sim 10^{-5}$ GeV$^{-1}$. This is informally known as the ALP "cosmological triangle" since it can be excluded only using standard cosmological arguments. As we shall mention, however, there are viable cosmological models that are compatible with axion-like particles with parameters in such region. We also discuss possibilities to explore the cosmological triangle experimentally in upcoming accelerator experiments.
