Bal Anubha, Curtis Edward, Magnan Anne-Marie, Maier Benedikt, Robens Tania, Wardle Nicholas
Physics Department, Imperial College London, Prince Consort Road, London, SW7 2BW UK.
Rudjer Boskovic Institute, Bijenicka cesta 54, 10000 Zagreb, Croatia.
Eur Phys J C Part Fields. 2025;85(8):891. doi: 10.1140/epjc/s10052-025-14622-y. Epub 2025 Aug 21.
We present a search for new scalar bosons predicted by the Inert Doublet Model at an machine with centre-of-mass energies of 240 and 365 . Within this model, four additional scalar bosons ( and ) are predicted. Due to an additional symmetry, the lightest new scalar, here chosen to be , is stable and provides an adequate dark matter candidate. The search for pair production of the new scalars is investigated in final states with two electrons or two muons, in the context of the future circular collider proposal, FCC-ee. Building on previous studies in the context of the CLIC proposal, this analysis extends the search to detector-level objects, using a parametric neural network to enhance the signal contributions over the Standard Model backgrounds, and sets projected exclusion and discovery contours in the vs. plane. With a total integrated luminosity of 10.8 (2.7) for 240 (365) , the discovery reach for the model goes up to for at 240 (365) . For exclusion, almost the entire phase-space available in the vs. plane is expected to be ruled out at 95% CL, reaching up to .
我们展示了在质心能量为240和365 GeV的对撞机上寻找惰性双态模型所预测的新标量玻色子的研究。在该模型中，预测存在另外四个标量玻色子（H⁺、H⁻、A⁰和H⁰）。由于一种额外的对称性，最轻的新标量（这里选为H⁰）是稳定的，并提供了一个合适的暗物质候选者。在未来圆形对撞机提案FCC - ee的背景下，研究了在有两个电子或两个μ子的末态中寻找新标量玻色子对产生的情况。基于之前在CLIC提案背景下的研究，本分析将搜索扩展到探测器层面的对象，使用参数化神经网络增强信号贡献相对于标准模型背景的比例，并在mH⁰与mA⁰平面上设定预期的排除和发现轮廓。对于240（365）GeV，总积分亮度为10.8（2.7）fb⁻¹，在240（365）GeV时，该模型的发现范围对于mA⁰ < mH⁰可达500 GeV。对于排除，预计在95%置信水平下，mH⁰与mA⁰平面上几乎所有可用的相空间将被排除，可达mA⁰ = 1 TeV。
