Year: 2026
Type: preprint
Abstract: We derive an analytic resummed description of the missing-mass spectrum in monophoton searches for invisible dark photons at electron--positron colliders. In a dark Abelian Higgs model with a light dark fermion, we construct the spectrum from scalar and fermionic real and virtual contributions without relying on a Monte Carlo shower implementation. Sudakov resummation method is used to deal with the collinear divergence. The analytic expressions make the dependence on the dark charges and the logarithmic structure explicit. A simplified reinterpretation of the BaBar monophoton search, accounting for its finite missing-mass resolution, shows that dark-sector radiation can modify the inferred upper limit on the kinetic-mixing parameter by $\mathcal{O}(10\%)$ in the benchmarks considered.
Source: arXiv (Cornell University)
Institution: Jinan University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G2049368085, G2546017766
OpenAlex ID: W7202378019