Higgs-Physics at a Future Electron Proton Collider

对希格斯玻色子的精确测量，特别是它与费米子和玻色子的耦合参数以及它的总宽度，将允许测试电弱对称破缺的机制，从而打开一扇了解标准模型以外的物理学的窗口。目前正在讨论的几个未来对撞机项目旨在为这些高精度测量提供实验设施。最突出的项目将使用电子-正电子对撞，例如国际直线对撞机(ILC)或环形电子正电子对撞机(CEPC)提案。近年来，大型强子对撞机(LHC)质心能量高达1.3TeV的电子-质子对撞机显然可能成为一种潜在的低成本替代方案。仔细进行的研究表明，结合在电子-质子和质子-质子碰撞中收集的数据，可以在希格斯耦合参数上产生具有竞争力的精度。然而，到目前为止，还不清楚是否也可以进行全希格斯宽度测量。此外，全面的探测器模拟目前不用于全面的探测器或物理性能评估。在德国粒子物理界最新的战略研讨会上，对未来大型电子强子对撞机(LHeC)上的希格斯物理势的此类研究得到了大力鼓励。在这项研究项目中，我们将进一步开发完整的LHeC探测器模拟，并使用替代信号和背景样本巩固相关研究。此外，我们计划利用希格斯玻色子产生的质心能量的截面依赖关系来测量模型无关的希格斯玻色子的总宽度的可能性。

Precision measurements of the Higgs boson, in particular its coupling parameters to fermions and bosons as well as its total width, would allow to test the mechanics of electroweak symmetry breaking and thus open a window to physics beyond the Standard Model. Several future collider projects, which are currently under discussion, aim to provide the experimental facilities for these high precision measurements. The most prominent projects would use electron-positron collisions, such as the International Linear Collider (ILC) or the Circular Electron Positron Collider (CEPC) proposals. In recent years, it became evident that an electron-proton collider with a center-of-mass energy of up to 1.3 TeV at the Large Hadron Collider (LHC) could be a potential low-cost alternative. Carefully conducted studies suggest that a combination of data collected in electron-proton and proton-proton collisions would yield a competitive precision on Higgs coupling parameters. However, as of now it is not clear whether a total Higgs width measurement could be performed as well. Moreover, a full detector simulation is currently not used for full detector- or physics-performance evaluations. Such studies on the Higgs physics potential at a future Large electron Hadron Collider (LHeC) were strongly encouraged during the latest strategy workshop of the German particle physics community. Within this research project, we will further develop the full LHeC detector simulation and consolidate the relevant studies using alternative signal and background samples. Moreover, we plan to investigate the possibility to use the cross-section dependence on the center-of-mass energy of the Higgs boson production in order to measure a model independent total width of the Higgs boson.