Linking a 152 GeV diphoton excess to dark matter and gravitational waves in the singlet-extended 2HDM
Abstract
We investigate the diphoton excesses near 152 GeV accompanied by missing transverse momentum (MET) in the Type-I two-Higgs-doublet model extended by a complex scalar singlet, whose imaginary component serves as a pseudo-Nambu-Goldstone dark matter (DM) candidate χ. The signal arises from the cascade process gg→ h3→ h2h2→γγχχ, where h2 is the scalar resonance near 152 GeV and h3 is a heavier CP-even scalar. After imposing the theoretical and experimental constraints, we identify parameter regions that accommodate at least one of the Low-MET and High-MET excesses within 1σ and simultaneously reproduce the observed DM relic density within an assumed 10% theoretical uncertainty. A subset of these samples supports first-order electroweak phase transitions with substantial supercooling. For a three-year observation, selected samples yield gravitational-wave signals with signal-to-noise ratios (SNRs) above $10$ at LISA, TianQin, DECIGO, and BBO. A representative benchmark that accommodates both excesses within their respective 1σ intervals and satisfies the relic-density requirement yields a three-year BBO SNR of approximately $173$.
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BibTeX
@misc{dong2026linking,
title = {{Linking a 152 GeV diphoton excess to dark matter and gravitational waves in the singlet-extended 2HDM}},
author = {Yabo Dong and Jun Fan and Kun Wang and Haijun Yang and Jingya Zhu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.39057},
eprint = {2610.39057},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.39057},
}
RIS
TY - UNPB
TI - Linking a 152 GeV diphoton excess to dark matter and gravitational waves in the singlet-extended 2HDM
AU - Yabo Dong
AU - Jun Fan
AU - Kun Wang
AU - Haijun Yang
AU - Jingya Zhu
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.39057
UR - https://arxiv.org/abs/2610.39057
AB - We investigate the diphoton excesses near 152 GeV accompanied by missing transverse momentum (MET) in the Type-I two-Higgs-doublet model extended by a complex scalar singlet, whose imaginary component serves as a pseudo-Nambu-Goldstone dark matter (DM) candidate χ. The signal arises from the cascade process gg→ h_3→ h_2h_2→γγχχ, where h_2 is the scalar resonance near 152 GeV and h_3 is a heavier CP-even scalar. After imposing the theoretical and experimental constraints, we identify parameter regions that accommodate at least one of the Low-MET and High-MET excesses within 1σ and simultaneously reproduce the observed DM relic density within an assumed 10% theoretical uncertainty. A subset of these samples supports first-order electroweak phase transitions with substantial supercooling. For a three-year observation, selected samples yield gravitational-wave signals with signal-to-noise ratios (SNRs) above $10$ at LISA, TianQin, DECIGO, and BBO. A representative benchmark that accommodates both excesses within their respective 1σ intervals and satisfies the relic-density requirement yields a three-year BBO SNR of approximately $173$.
ER -