550 GeV 线性产生器上希格斯自耦合测量

希格斯机制是标准模型成功的关键，可通过确定希格斯自耦合进行实验验证。作为希格斯势的简单模型，标准模型以希格斯玻色子质量和真空期望值表达式明确预测希格斯自耦合。任何偏离都表明标准模型之外的物理，并有助于指导扩展的希格斯模型。在足够大的中心-of-mass 能量下，双希格斯产生提供对三线型希格斯自耦合的树级灵敏度。在 550 GeV 时，$e^+e^-$ 的主要产生模式来自双希格斯辐射，WW 融合贡献较小。本文 extrapolated based on a full simulation analysis from 2014 by incorporating expected improvements in flavour tagging and kinematic reconstruction for event selection, and are presented in this contribution together with the ongoing re-analysis using fast SGV (Simulation a Grande Vitesse) simulations of the ILD detector concept on a full SM background including the aforementioned state-of-the-art reconstruction and analysis tools。