论文标题
在2HDM中探索相当大的三重希格斯耦合
Exploring sizable triple Higgs couplings in the 2HDM
论文作者
论文摘要
未来山脉的一项重要任务是测量三重希格斯耦合。根据其相对于标准模型（SM）值的尺寸，某些对撞机选项会导致更高的实验精度。在两个HIGGS双重模型（2HDM）I型和II的框架内，我们研究了所有三重希格斯耦合的允许范围，涉及至少一个光，类似Sm的Higgs Boson。我们考虑了理论约束（单位性，稳定性），直接Higgs-Boson搜索的实验约束，类似Smlike Higgs-Boson特性的测量值，风味可观察力和Electroweak Precision Precision数据。我们发现SM型Triple Higgs耦合W.R.T.它的SM值，$λ_{hhh}/λ_{\ rm sm} $，可以介于$ \ sim -0.5 $和$ \ sim 1.5 $之间。根据实现哪个值，HL-LHC可以与ILC竞争或显然不如ILC竞争。我们在$ \ sim -1.5 $和$ \ sim 1.5 $之间找到$λ_{hhh} $。涉及两个重型希格斯玻色子的三重希格斯耦合，$λ_{hhh} $，$λ_{haa} $和$λ_{hh^+h^ - } $可以达到最多可达到$ {\ cal o}（10）$，大致独立于2hdm类型。这可能会导致在HL-LHC或高能量$ E^+E^ - $ colleders的两个希格斯玻色子的产生可能会大大增强。
An important task at future colliders is the measurement of the triple Higgs coupling. Depending on its size relative to the Standard Model (SM) value, certain collider options result in a higher experimental accuracy. Within the framework of Two Higgs Doublet Models (2HDM) type I and II we investigate the allowed ranges for all triple Higgs couplings involving at least one light, SM-like Higgs boson. We take into account theoretical constraints (unitarity, stability), experimental constraints from direct Higgs-boson searches, measurements of the SM-like Higgs-boson properties, flavor observables and electroweak precision data. We find that the SM-type triple Higgs coupling w.r.t. its SM value, $λ_{hhh}/λ_{\rm SM}$, can range between $\sim -0.5$ and $\sim 1.5$. Depending on which value is realized, the HL-LHC can compete with, or is clearly inferior to the ILC. We find the coupling $λ_{hhH}$ between $\sim -1.5$ and $\sim 1.5$. Triple Higgs couplings involving two heavy Higgs bosons, $λ_{hHH}$, $λ_{hAA}$ and $λ_{hH^+H^-}$ can reach values up to ${\cal O}(10)$, roughly independent of the 2HDM type. This can lead to potentially strongly enhanced production of two Higgs-bosons at the HL-LHC or high-energy $e^+e^-$ colliders.
