AI 中文总结
该研究在大λ、低tanβ的scNMSSM中，以双圈精度研究双希格斯产生与希格斯自耦合三线性项，发现其符合ATLAS+CMS上限，相关结果或可在HL-LHC检验，且对电弱相变研究有定性意义。
AI 中文摘要
本研究在大λ、低tanβ的scNMSSM（半约束次最小超对称标准模型）中，以完整双圈精度研究希格斯自耦合三线性项与双希格斯产生截面。对受理论、对撞机、味物理及暗物质约束的100万个参数点进行随机扫描，得到66个类标准模型点，其单态分数S₁₃²<0.05，均处于m_h₁∈[122.0,125.0]GeV质量范围——该特征反映了大λ、低tanβ下scNMSSM的固有属性：双态主导构型在运动学上被限制在~125GeV以下。研究发现三线性耦合比普遍被抑制：κ_λ=0.884–0.982，平均值⟨κ_λ⟩=0.944±0.018。√s=13.6TeV下的非共振双希格斯截面处于30.3–36.9fb（为标准模型的0.88–1.05σ），而通过gg→h₃→h₁h₁的共振贡献可忽略（≤0.004fb）。所有预测与当前ATLAS+CMS双希格斯上限一致，预计将在HL-LHC（高亮度大型强子对撞机）上得到探测。这些结果在电弱相变背景下被讨论，其中κ_λ的普遍抑制与可支撑增强一阶相变的修正希格斯势定性一致。通过有限温度分析定量确定相变强度留待未来工作完成。
英文摘要
The trilinear Higgs self-coupling and di-Higgs production cross section are investigated in the semi-constrained NMSSM (scNMSSM) at large-$λ$ / low-$\tanβ$ with full two-loop precision. A random scan of one million parameter points subject to theoretical, collider, flavor, and dark matter constraints yields 66 SM-like points with singlet fraction $S_{13}^2 < 0.05$, all found in the mass range $m_{h_1} \in [122.0,\,125.0]~\text{GeV}$ --- a feature that reflects an intrinsic property of the scNMSSM at large-$λ$ / low-$\tanβ$, where doublet-dominated configurations are kinematically confined below ${\sim}125~\text{GeV}$. The trilinear coupling ratio is found to be universally suppressed: $κ_λ= 0.884$--$0.982$, $\langleκ_λ\rangle = 0.944 \pm 0.018$. The non-resonant di-Higgs cross section at $\sqrt{s} = 13.6~\text{TeV}$ lies in the range $30.3$--$36.9~\text{fb}$ ($0.88$--$1.05\,σ_{\rm SM}$), with the resonant contribution via $gg \to h_3 \to h_1h_1$ negligible ($\leq 0.004~\text{fb}$). All predictions are consistent with current ATLAS+CMS di-Higgs upper limits and is expected to be probed at the HL-LHC. These results are discussed in the context of the electroweak phase transition, where the universal suppression of $κ_λ$ is qualitatively consistent with a modified Higgs potential that could support a strengthened first-order transition. A quantitative determination of the phase transition strength via finite-temperature analysis is left for future work.
Comments3 figures
Journal refMod. Phys. Lett. A (2026) 2650207
