Effect of inelastic scalar dark matter in hidden U(1) scenario after the LZ nuclear recoil

@misc{das2026effect,
  title = {{Effect of inelastic scalar dark matter in hidden $U(1)$ scenario after the LZ nuclear recoil}},
  author = {Arindam Das and Takaaki Nomura},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.15600},
  eprint = {2609.15600},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.15600},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Effect of inelastic scalar dark matter in hidden U(1) scenario after the LZ nuclear recoil
AU  - Arindam Das
AU  - Takaaki Nomura
PY  - 2026
DA  - 2026/09/18
PB  - arXiv
DO  - 10.48550/arxiv.2609.15600
UR  - https://arxiv.org/abs/2609.15600
AB  - We study a hidden U(1)_H extension of the Standard Model (SM) introducing two SM singlet complex scalar fields where one of them can be considered as a viable inelastic Dark Matter (DM) candidate due to its U(1)_H charge being half of the charge of the other one which develops a vacuum expectation value. First we estimate a parameter region satisfying observed DM relic abundance through DM annihilation and further use these parameters to study inelastic DM-nucleus scattering to reproduce the recent high nuclear recoil energy event found by LZ collaboration. These interactions are mediated by a dark photon (A^′) which is evolved after the spontaneous breaking of U(1)_H symmetry and having a kinetic mixing with the SM photon. Hence we estimate bounds on the kinetic mixing as a function of A^′ mass and finally compare it with existing experimental bounds from different beam-dump and collider experiments. These parameters could be probed by lifetime and energy frontier experiments in future.
ER  -