发表机构
Department of Physics, Liaoning Normal University; Center for Theoretical and Experimental High Energy Physics, Liaoning Normal University（辽宁师范大学物理学院; 辽宁师范大学理论与实验高能物理中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过FCC-ee的$e^+e^-\to\gamma\gamma jj$过程，在91 GeV能量下探测轴子类粒子与轻子的耦合，发现极化束流能显著提高灵敏度，并在不同质量区间给出互补的耦合上限。
AI 中文摘要
我们研究了未来环形对撞机在正负电子模式（FCC-ee）下，通过过程$e^{+}e^{-} \rightarrow \gamma\gamma jj$在质心能量$\sqrt{s}=91$ GeV、积分亮度$\mathcal{L}=150~\text{ab}^{-1}$下，对轴子类粒子（ALP）与轻子耦合的灵敏度。我们分析了三种情形，$\mathbf{c}_R=0$、$\mathbf{c}_L=0$和$\mathbf{c}_R=\mathbf{c}_L$，针对非极化和极化束流（$(P_{e^-}, P_{e^+}) = (+80\\%, -80\\%)$），并推导了有效耦合强度的预期下限。极化情形比非极化情形提供更高的灵敏度。具体而言，对于$\mathbf{c}_R=0$情形（探测ALP-中微子耦合$\text{Tr}(g_{a\nu\nu})/f_a$），极化情形下的预期灵敏度在ALP质量范围10--24 GeV内达到约$0.0105~\text{GeV}^{-1}$；对于$\mathbf{c}_L=0$（探测ALP-带电轻子耦合$\text{Tr}(g_{a\ell\ell})/f_a$），在10--27 GeV范围内达到$0.0174~\text{GeV}^{-1}$；对于$\mathbf{c}_R=\mathbf{c}_L$（探测ALP-中微子耦合$\text{Tr}(g_{a\nu\nu})/f_a$），在45--80 GeV范围内达到$0.00394~\text{GeV}^{-1}$。在这些ALP质量范围内，我们的预期灵敏度与未来对撞机上其他搜索通道的预期灵敏度互补。
英文摘要
We study the sensitivity of the Future Circular Collider in electron-positron mode (FCC-ee) to the axion-like particle (ALP) couplings with leptons via the process $e^{+}e^{-} \rightarrow γγjj$ at the center-of-mass energy $\sqrt{s}=91$ GeV with the integrated luminosity $\mathcal{L}=150~\text{ab}^{-1}$. We analyze three scenarios, $\mathbf{c}_R=0$, $\mathbf{c}_L=0$ and $\mathbf{c}_R=\mathbf{c}_L$, for both unpolarized and polarized beams with $(P_{e^-}, P_{e^+}) = (+80\%, -80\%)$, and derive projected lower limits on the effective coupling strengths. The polarized case provides higher sensitivity than the unpolarized case. Specifically, for the $\mathbf{c}_R=0$ scenario (probing the ALP-neutrino coupling $\text{Tr}(g_{aνν})/f_a$), the projected sensitivity in the polarized case reaches approximately $0.0105~\text{GeV}^{-1}$ for the ALP mass in the range $10$--$24$ GeV; for $\mathbf{c}_L=0$ (probing the ALP-charged lepton coupling $\text{Tr}(g_{a\ell\ell})/f_a$), it reaches $0.0174~\text{GeV}^{-1}$ in the $10$--$27$ GeV range; and for $\mathbf{c}_R=\mathbf{c}_L$ (probing the ALP-neutrino coupling $\text{Tr}(g_{aνν})/f_a$), it reaches $0.00394~\text{GeV}^{-1}$ in the $45$--$80$ GeV range. In these ALP mass ranges, our projected sensitivities are complementary to the projected sensitivities from other search channels at future colliders.
Comments32 pages, 14 figures
