发表机构
Henan University; University of Shanghai for Science and Technology; Shanghai Jiao Tong University（河南大学; 上海理工大学; 上海交通大学）
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NMSSM中希格斯级联衰变产生双光子和缺失横动量信号，在HL-LHC上探测低于中微子背景的中性伴随暗物质，预期显著性约6.1σ。
AI 中文摘要
我们研究了在具有非普适规范微子质量的半约束次最小超对称标准模型中，通过希格斯级联衰变探测中微子背景以下的中性伴随暗物质的可能性。我们关注最轻中性伴随质量在65至100 GeV的范围，并研究过程$pp\to H_2\to A_1A_1\to\gamma\gamma+\tilde{\chi}_1^0\tilde{\chi}_1^0$，其中$H_1$是观测到的类SM希格斯玻色子，$H_2$是更重的CP偶态，$A_1$是最轻的CP奇态。所选参数区域位于$A_1$共振附近，满足$m_{A_1}>2m_{\tilde{\chi}_1^0}$，从而允许共振增强的中性伴随湮灭和不可见的$A_1$衰变。在施加理论和实验约束后，我们发现即使其遗迹密度重标的自旋无关散射截面低于中微子背景，仍存在级联信号截面约为0.16 fb（在$\sqrt{s}=14~\mathrm{TeV}$时）的存活样本。对一个代表性基准点进行蒙特卡洛分析，在高亮度LHC上积分亮度为$3000~\mathrm{fb}^{-1}$时，预期统计显著性约为$6.1\sigma$（忽略系统不确定性）。这些结果突显了双光子加缺失横动量通道作为中性伴随暗物质互补探针的潜力。
英文摘要
We investigate the potential of Higgs cascade decays to probe neutralino dark matter below the neutrino floor in the semi-constrained Next-to-Minimal Supersymmetric Standard Model with nonuniversal gaugino masses. We focus on lightest-neutralino masses of 65 to 100 GeV and study the process $pp\to H_2\to A_1A_1\toγγ+\tildeχ_1^0\tildeχ_1^0$, where $H_1$ is the observed SM-like Higgs boson, $H_2$ is a heavier CP-even state, and $A_1$ is the lightest CP-odd state. The selected parameter region lies near the $A_1$ resonance, with $m_{A_1}>2m_{\tildeχ_1^0}$, allowing both resonantly enhanced neutralino annihilation and invisible $A_1$ decays. After imposing theoretical and experimental constraints, we find surviving samples with cascade signal cross sections of approximately 0.16 fb at $\sqrt{s}=14~\mathrm{TeV}$ even when their relic-density-rescaled spin-independent scattering cross sections lie below the neutrino floor. A Monte Carlo analysis of a representative benchmark point yields an expected statistical significance of approximately $6.1σ$ at the high-luminosity LHC with an integrated luminosity of $3000~\mathrm{fb}^{-1}$, neglecting systematic uncertainties. These results highlight the potential of the diphoton plus missing transverse momentum channel as a complementary probe of neutralino dark matter.
Comments13 pages, 5 figures, 2 tables
