Invisible dark-sector radiation: analytic resummation for dark photon searches

@misc{deng2026invisible,
  title = {{Invisible dark-sector radiation: analytic resummation for dark photon searches}},
  author = {Xiangyu Deng and Rongfeng Ou and Yi Li and Mengchao Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2608.12079},
  eprint = {2608.12079},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.12079},
}

TY  - UNPB
TI  - Invisible dark-sector radiation: analytic resummation for dark photon searches
AU  - Xiangyu Deng
AU  - Rongfeng Ou
AU  - Yi Li
AU  - Mengchao Zhang
PY  - 2026
DA  - 2026/10/12
PB  - arXiv
DO  - 10.48550/arxiv.2608.12079
UR  - https://arxiv.org/abs/2608.12079
AB  - 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 𝒪(10%) in the benchmarks considered.
ER  -