Production of lepton-flavor-violating scalars through resonant positive-muon annihilation on atomic electrons
Abstract
We investigate an invisible lepton-flavor-violating scalar ϕ with exclusive e−μ couplings and study its resonant production via μ+e-→ϕ in fixed-target experiments. Since the effective center-of-mass energy is determined by the momentum of the initial-state bound electrons, atomic effects can significantly affect the resonance behavior. We therefore employ relativistic bound-state electron wave functions to calculate the production cross section and reveal a material-dependent broadening of the resonance lineshape. For the proposed HIAF experiment, fewer than one day of data taking (6×1010 MOT) can probe couplings at the 10−5 level at 90\% confidence level near resonance, demonstrating that high-intensity muon fixed-target experiments provide a powerful complementary probe of lepton-flavor violation.
Related
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- Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at √s = 13 TeV and 13.6 TeV
- Seeing in the Dark: Gravitational Waves from Resonant Production of Dark Photon Dark Matter
- Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at √s=13 TeV and 13.6 TeV
BibTeX
@misc{shen2026production,
title = {{Production of lepton-flavor-violating scalars through resonant positive-muon annihilation on atomic electrons}},
author = {Jinhong Shen and Youpeng Wu and Zijian Wang and Leyun Gao and Qite Li and Chen Zhou and Qiang Li and Yu Xu and Xueheng Zhang and Liangwen Chen and He Zhao and Zhiyu Sun and Ruihu Zhu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2607.18669},
eprint = {2607.18669},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.18669},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Production of lepton-flavor-violating scalars through resonant positive-muon annihilation on atomic electrons
AU - Jinhong Shen
AU - Youpeng Wu
AU - Zijian Wang
AU - Leyun Gao
AU - Qite Li
AU - Chen Zhou
AU - Qiang Li
AU - Yu Xu
AU - Xueheng Zhang
AU - Liangwen Chen
AU - He Zhao
AU - Zhiyu Sun
AU - Ruihu Zhu
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2607.18669
UR - https://arxiv.org/abs/2607.18669
AB - We investigate an invisible lepton-flavor-violating scalar ϕ with exclusive e−μ couplings and study its resonant production via μ^+e^-→ϕ in fixed-target experiments. Since the effective center-of-mass energy is determined by the momentum of the initial-state bound electrons, atomic effects can significantly affect the resonance behavior. We therefore employ relativistic bound-state electron wave functions to calculate the production cross section and reveal a material-dependent broadening of the resonance lineshape. For the proposed HIAF experiment, fewer than one day of data taking (6×10^10 MOT) can probe couplings at the 10^−5 level at 90\% confidence level near resonance, demonstrating that high-intensity muon fixed-target experiments provide a powerful complementary probe of lepton-flavor violation.
ER -