JournalPhysical Review D (2470-0010), 109, 015017-1 ~ 015017-23
Enrollment typeSCIE
publication date 20240119
In this study, we explore the phenomenological signatures associated with a light fermiophobic Higgs boson, $h_f$, within the type-I two-Higgs-doublet model at the HL-LHC. Our meticulous parameter scan illuminates an intriguing mass range for $m_{h_f}$, spanning [1,10] GeV. This mass range owes its viability to substantial parameter points, largely due to the inherent challenges of detecting the soft decay products of $h_f$ at contemporary high-energy colliders. Given that this light hf ensures $Br(h_f\to\gamma\gamm)\simeq1$, $Br(H^\pm\to h_fW^\pm)\simeq1$, and $M_{H^\pm}？330 GeV$, we propose a golden discovery channel: $pp\to h_fH^\pm\to\gamma\gamma\gamma\gamm l^\pm\nu$, where $l^\pm$includes $e^\pm$ and $\mu^\pm$. However, a significant obstacle arises as the two photons from the $h_f$ decay mostly merge into a single jet due to their proximity within $\Delta R<0.4$. (Skip)
