scNMSSM模型中的多道双希格斯产生：HL-LHC上从奇异8b到增强8tau信号的研究
Multi-Channel Di-Higgs Production in the scNMSSM: From Exotic 8b to Boosted 8tau Signatures at the HL-LHC
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中文总结 AI 辅助
该研究在scNMSSM模型中，针对HL-LHC的13.6 TeV、3000 fb⁻¹条件，分析四类基准双希格斯信号，发现增强8τ拓扑未被现有LHC搜索覆盖，需专用亚喷注策略，8b拓扑或达5σ灵敏度。
中文摘要 AI 辅助
我们在大型λ/低tanβ的半约束 next-to-minimal 超对称标准模型（scNMSSM）中，研究了质心系能量√s=13.6 TeV、积分亮度L=3000 fb⁻¹的高亮度大型强子对撞机（HL-LHC）上多道双希格斯信号的前景。基于前期工作，从66个可行的类标准模型（SM-like）候选者中选取了4个基准点，涵盖三种双希格斯拓扑：奇异多b道（h1h1→4a1→8b，BP1/BP3）、增强多τ道（h1h1→4a1→8τ，BP2）以及类SM道（BP4）。对每个基准点的10⁵个信号事例，采用完整的信号模拟链（MadGraph5_aMC@NLO + Pythia 8.316 + Delphes 3）进行处理。本底事例数通过已发表的LHC分析估算，仅用于指示性的灵敏度预测。对于8b拓扑（BP1：a1质量m_a1=47.4 GeV，BP3：m_a1=51.9 GeV），当b喷注效率ε(≥4b)约为14%时，信号事例数S约为14000-16000，在采用的简化本底模型下可能达到5σ灵敏度。对于增强8τ拓扑（BP2：m_a1=8.2 GeV），由于洛伦兹增强因子γ约为7.5，82.4%的同a1 τ对的ΔR(τ,τ)<0.4，小于标准喷注锥半径；该拓扑的ε(≥2τ)=38.4%，比SM基准值高约21倍，但因不可约多τ本底需要专用的增强a1标记器。BP4作为类SM参考，与现有HL-LHC的HH预测一致；希格斯自耦合修正因子κ_λ在[0.884, 0.951]范围内，整体被压低至1以下。BP2的增强a1拓扑未被ATLAS或CMS现有的任何双希格斯搜索覆盖，强烈推动HL-LHC开展专用的亚喷注分析策略。
英文摘要
We investigate multi-channel di-Higgs signal prospects in the semi-constrained Next-to-Minimal Supersymmetric Standard Model (scNMSSM) at large-lambda/low-tan(beta) at the HL-LHC with sqrt(s) = 13.6 TeV and L = 3000 fb^{-1}. Building on our previous work, four benchmark points are selected from 66 viable SM-like candidates, spanning three di-Higgs topologies: exotic multi-b (h1h1 -> 4a1 -> 8b, BP1/BP3), boosted multi-tau (h1h1 -> 4a1 -> 8tau, BP2), and SM-like (BP4). A complete signal simulation chain (MadGraph5_aMC@NLO + Pythia 8.316 + Delphes 3) is employed for 10^5 signal events per benchmark point. Background yields are estimated from published LHC analyses and are used only for indicative sensitivity projections. For the 8b topology (BP1: m_{a1} = 47.4 GeV, BP3: m_{a1} = 51.9 GeV), b-jet efficiencies of epsilon(>=4b) ~ 14% yield S ~ 14,000-16,000 events, potentially compatible with 5-sigma sensitivity under the simplified background model adopted. For the boosted 8tau topology (BP2: m_{a1} = 8.2 GeV), 82.4% of same-a1 tau-pairs have Delta R(tau,tau) < 0.4, below the standard jet cone radius, due to the large Lorentz boost gamma ~ 7.5. This topology yields epsilon(>=2tau) = 38.4%, a factor of ~21 above the SM baseline, but requires dedicated boosted a1 taggers due to irreducible multi-tau backgrounds. BP4 serves as a SM-like reference, consistent with existing HL-LHC HH projections. The Higgs self-coupling modifier kappa_lambda in [0.884, 0.951] is universally suppressed below unity. The boosted a1 topology of BP2 is not covered by any existing ATLAS or CMS di-Higgs search, strongly motivating dedicated sub-jet analysis strategies at the HL-LHC.
