We discuss neutral Higgs boson production through gluon fusion and bottom-quark annihilation in the CP-conserving $\mathbb{Z}_3$-invariant Next-to-Minimal Supersymmetric Standard Model (NMSSM) at proton colliders. For gluon fusion we adapt known asymptotic expansions in supersymmetric particles for the inclusion of next-to-leading order contributions of squarks and gluinos from the Minimal Supersymmetric Standard Model (MSSM) and include electro-weak corrections involving light quarks. Together with the resummation of higher order sbottom contributions in the bottom-quark Yukawa coupling for both production processes we thus present accurate cross section predictions implemented in a new release of the code SusHi. We elaborate on the new features of an additional SU$(2)_L$ singlet in the production of CP-even and -odd Higgs bosons with respect to the MSSM and include a short discussion of theory uncertainties.
In this study, we explore the detectability of heavy Higgs bosons in the $pp \to b\bar{b}H/A \to b\bar{b}t\bar{t}$ channel at a 100 TeV hadron collider within the semi-constrained Next-to-Minimal Supersymmetric Standard Model (NMSSM). We calculate their production cross sections and decay branching ratios, comparing these with simulation results from existing reference. We focus on the heavy, doublet-dominated CP-even Higgs $H$ and CP-odd Higgs $A$, with mass limits set below 10 TeV to ensure detectability. We find that at a collider with 3 ab$^{-1}$ of integrated luminosity, the potential for…
NMSSMCALC: A Program Package for the Calculation of Loop-Corrected Higgs Boson Masses and Decay Widths in the (Complex) NMSSM
本文给出了计算CP守恒和CP破坏NMSSM中环修正NMSSM希格斯玻色子玻色子质量和衰变宽度的程序包NMSSMCALC。在壳层上和$\overline{\mbox{DR}}$条件的混合重整化方案中，对希格斯玻色子质量进行了完整的单圈修正。Higgs衰变宽度包含了主要的高阶QCD修正，而衰变为底夸克、奇夸克和τ轻子的过程则通过有效耦合得到了高阶超对称修正的补充。所有相关的离壳衰变到两个大质量规范玻色子，规范和希格斯玻色子玻色子和希格斯对的最终状态，以及到重夸克对计算。输入和输出文件具有SUSY Les Houches Accord的功能，因此该程序可以很容易地与现有的计算机工具连接。
We evaluate the full next-to-leading order supersymmetric (SUSY) electroweak and SUSY-QCD corrections to the on-shell two-body decays of the charged Higgs bosons in the framework of the CP-conserving and CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM). Our corrections are implemented in the code NMSSMCALCEW in order to compute the branching ratios of the charged Higgs boson where we also take into account the state-of-the-art QCD corrections already included in the code. We investigate the impact of the NLO corrections for each decay mode in a wide range of …
We present the full next-to-leading order (NLO) supersymmetric (SUSY) electroweak and SUSY-QCD corrections to the decay widths of the charged Higgs boson decays into on-shell final states in the framework of the CP-conserving and CP-violating Next-to-Minimal Supersymmetric Model (NMSSM). The newly calculated corrections have been implemented in the code NMSSMCALCEW. In these proceedings, we discuss the impact of the NLO corrections on the charged Higgs boson branching ratios in a wide range of the parameter space that is still compatible with the experimental constraints. We also investigate t…
R-parity conserving supersymmetric models with right-handed (RH) neutrinos are very appealing since they could naturally explain neutrino physics and also provide a good dark matter (DM) candidate such as the lightest supersymmetric particle (LSP). In this work we consider the next-to-minimal supersymmetric standard model (NMSSM) plus RH neutrino superfields, with effective Majorana masses dynamically generated at the electroweak scale (EW). We perform a scan of the relevant parameter space and study both possible DM candidates: RH sneutrino and neutralino. Especially for the case of RH sneutr…
Prospects for discovering a light charged Higgs boson within the NMSSM at the FCC-eh collider
分析了在未来圆形对撞机上利用$\sqrt s \approx 3.5$ TeV在强子-电子模式（FCC-eh）下通过$h^{-} \to s \bar c + s \bar u$观测相对轻荷希格斯玻色子（$h^{\pm}$）衰变的前景。假设中间体希格斯玻色子（$h_2$）是类标准模型（SM），在次极小超对称标准模型（NMSSM）框架下研究了$e^- b \to ν_e h^{-} b$（$b$在初态和终态都可以是$\bar b$）的产生.我们考虑暗物质（DM），超粒子和希格斯玻色子数据的约束。带电的希格斯玻色子衰变成轻的味道，导致三个喷流与一个$b$标记的喷流失去横向能量信号。我们的研究结果表明，光荷希格斯玻色子的质量接近，例如，114（121）GeV具有3.2（1.8）$σ$的最大显著性，在使用基于正常切割的选择和1 ab $^{-1}$的光度之后。然而，我们进一步采用优化技术，以提高后者的4.4（2.2）PDMATHAMT，分别。
We present our computation of the ${\cal O}((α_t+α_λ+α_κ)^2)$ two-loop corrections to the Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric Standard Model (NMSSM) using the Feynman-diagrammatic approach in the gaugeless limit at vanishing external momentum. We choose a mixed $\overline{\mbox{DR}}$-on-shell (OS) renormalisation scheme for the Higgs sector and apply both $\overline{\mbox{DR}}$ and OS renormalisation in the top/stop sector. For the treatment of the infrared divergences we apply and compare three different regularisation methods: the introduction of a regulator…
鉴于最近发现的125 GeV的希格斯玻色子，我们研究了次极小超对称标准模型（NMSSM）的Peccei-Quinn不变扩展的现象学。极小模型没有NMSSM单重场的二次和三次项，预言了一个轻的类单重最轻超对称粒子（LSP）。该模型受到希格斯粒子不可见衰变和LSP的暗物质特性的强烈约束，而一些约束可以通过假设Peccei-Quinn扇区中轴子的CP偶伴saxion导致后期熵产生稀释热LSP密度来放松。该模型的对撞机信号包含多喷流和$h/W/Z$加上丢失能量，在14 TeV LHC运行的早期就能发现。
Production of a light top-squark pair in association with a light non-standard Higgs boson within the NMSSM at the 13 TeV LHC and a 33 TeV proton collider
我们研究了大型强子对撞机加速器和未来33 TeV质子对撞机的潜力，以观察与最轻的希格斯玻色子（${\tilde t}_1 {\tilde t}_1 h_1$）相关联的轻顶夸克对的产生，正如次最小超对称标准模型（NMSSM）所预测的那样。我们随机扫描NMSSM参数空间的大约一千万个点，允许最轻的顶夸克和最轻的希格斯玻色子的所有可能的衰变，没有关于它们衰变率的假设，除了已知的物理约束，例如微扰边界，与最近的普朗克实验测量一致的暗物质遗迹密度，希格斯质量边界上的下一个最轻的希格斯玻色子，$h_2$，假设它与LHC对标准模型希格斯玻色子玻色子的测量、电荷子质量和Z不可见宽度的LEP界、B介子稀有衰变的实验界以及一些与我们研究的粒子不同的超对称粒子谱的LHC实验界是一致的。我们发现，对于低质量顶夸克，主要的衰变模式是${\tilde t}_1 \rightarrow b \tildeχ_1^{\pm}$与$\tildeχ_1^{\pm} \rightarrow W^{\pm} \tildeχ_1^0 $。我们使用三个基准点与最高的横截面，这自然属于压缩光谱的顶部squark，并进行现象学分析，以确定最佳的事件选择，最大限度地提高信号的显着性超过背景。我们着重研究了$W$的轻子衰变和最轻的希格斯玻色子衰变为b夸克（$h_1 \rightarrow b \bar b$）。我们的研究结果表明，高亮…
Unlike its minimal counterpart, the Next to Minimal supersymmetric Standard Model (NMSSM) allows the possibility that the lightest neutralino could have a mass as small as $\sim 1 {\rm GeV}$ while still providing a significant component of relic dark matter (DM). Such a neutralino can provide an invisible decay mode to the Higgs as well. Further, the observed SM-like Higgs boson ($H_{125}$) could also have an invisible branching fraction as high as $\sim 19\%$. Led by these facts, we first delineate the region of parameter space of the NMSSM with a light neutralino ($M_{{\tildeχ}_{1}^{0}} < 62…
R-parity violation and CP-violating and CP-conserving spin asymmetries in l^+ l^- -> sneutrino -> tau^+ tau^-: probing sneutrino mixing at LEP2, NLC and mu^+mu^- colliders
We study the possibility of measuring neutrino Yukawa couplings in the Next-to-Minimal Supersymmetric Standard Model with right-handed neutrinos (NMSSMr) when the lightest Supersymmetric partner (a right-handed sneutrino) is the Dark Matter (DM) candidate, by exploiting a `dijet + dilepton + Missing Transverse Energy' (MET) signature. We show that, unlike the miminal realisation of Supersymmetry (SUSY), i.e., the MSSM, for which the DM candidate is a much heavier (fermionic) state (a neutralino), this non-minimal SUSY model offers one with a much lighter (bosonic) state (a sneutrino) as DM, wh…
