Experimentally probing the charm-Yukawa coupling in the LHC experiments is important, but very challenging due to an enormous QCD background. We study a new channel that can be used to search for the Higgs decay $H\to c\overline{c}$, using the vector boson fusion (VBF) mechanism with an associated photon. In addition to suppressing the QCD background, the photon gives an effective trigger handle. We discuss the trigger implications of this final state that can be utilized in ATLAS and CMS. We propose a novel search strategy for $H\to c\overline{c}$ in association with VBF jets and a photon, where we find a projected sensitivity of about 13 times the SM charm-Yukawa coupling at 95% ${\mathrm{CL}}_s$ at High Luminosity LHC (HL-LHC). Our result is comparable and complementary to existing projections at the HL-LHC. We also discuss the implications of increasing the center of mass collision energy to 30 TeV and 100 TeV.

中文翻译：

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希格斯玻色子在矢量玻色子聚变和光子中吸引夸克衰变

在 LHC 实验中实验探测魅力-汤川耦合很重要，但由于巨大的 QCD 背景，这非常具有挑战性。我们研究了一种可用于搜索希格斯衰变的新通道$H\to C\overline{C}$，使用带有相关光子的矢量玻色子融合 (VBF) 机制。除了抑制 QCD 背景之外，光子还提供了有效的触发手柄。我们讨论了可以在 ATLAS 和 CMS 中使用的这个最终状态的触发含义。我们提出了一种新颖的搜索策略$H\to C\overline{C}$ 与 VBF 射流和光子相关联，我们发现投影灵敏度约为 SM 魅力-汤川耦合的 13 倍，为 95% ${\mathrm{CL}}_{秒}$在高亮度 LHC (HL-LHC)。我们的结果与 HL-LHC 的现有预测具有可比性和互补性。我们还讨论了将质心碰撞能量增加到 30 TeV 和 100 TeV 的影响。