LHC Mono-$W/Z$ Signatures as a Probe for Dark Matter Explanations of Astrophysical Excesses
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| Format: | Preprint |
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2026
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| _version_ | 1866914543098134528 |
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| author | Guo, Yu-Chen Li, Ying-Xin Lu, Chih-Ting |
| author_facet | Guo, Yu-Chen Li, Ying-Xin Lu, Chih-Ting |
| contents | The inert two-Higgs doublet model (IDM) is a compelling framework for weakly interacting massive particles (WIMPs) linked to electroweak symmetry breaking. It can account for both the Galactic Center gamma-ray excess (GCE) and the AMS-02 antiproton anomaly while also satisfying relic density and direct detection constraints for dark matter (DM) masses in the $55-75$ GeV range. Three specific DM annihilation channels can be identified: Higgs resonance, $SA$ co-annihilation, and $SS\to WW^{\ast}$ annihilation. Among these, the DM mass range of $70-75$ GeV with dominant $SS\to WW^{\ast}$ annihilation has received less attention in collider searches. To validate this parameter space, we combine LHC searches for mono-$W/Z$ signatures. In particular, we develop a channel-separation strategy to disentangle the contributions of charged mass splitting ($Δ^{\pm}$) and neutral mass splitting ($Δ^0$) in the inert scalar sector at the LHC. Our results indicate that most of the parameter space consistent with these astrophysical anomalies in the $SS\to WW^{\ast}$ annihilation regime will be testable at the High-Luminosity LHC. Specifically, from the leptonic channel we obtain a $2σ$ exclusion limit of $80 \lesssim Δ^0 \lesssim 260$ GeV, while the hadronic channel yields $30 \lesssim Δ^0 \lesssim 150$ GeV and $70 \lesssim Δ^{\pm} \lesssim 230$ GeV for $m_S = 70$ GeV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_07303 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | LHC Mono-$W/Z$ Signatures as a Probe for Dark Matter Explanations of Astrophysical Excesses Guo, Yu-Chen Li, Ying-Xin Lu, Chih-Ting High Energy Physics - Phenomenology High Energy Physics - Experiment The inert two-Higgs doublet model (IDM) is a compelling framework for weakly interacting massive particles (WIMPs) linked to electroweak symmetry breaking. It can account for both the Galactic Center gamma-ray excess (GCE) and the AMS-02 antiproton anomaly while also satisfying relic density and direct detection constraints for dark matter (DM) masses in the $55-75$ GeV range. Three specific DM annihilation channels can be identified: Higgs resonance, $SA$ co-annihilation, and $SS\to WW^{\ast}$ annihilation. Among these, the DM mass range of $70-75$ GeV with dominant $SS\to WW^{\ast}$ annihilation has received less attention in collider searches. To validate this parameter space, we combine LHC searches for mono-$W/Z$ signatures. In particular, we develop a channel-separation strategy to disentangle the contributions of charged mass splitting ($Δ^{\pm}$) and neutral mass splitting ($Δ^0$) in the inert scalar sector at the LHC. Our results indicate that most of the parameter space consistent with these astrophysical anomalies in the $SS\to WW^{\ast}$ annihilation regime will be testable at the High-Luminosity LHC. Specifically, from the leptonic channel we obtain a $2σ$ exclusion limit of $80 \lesssim Δ^0 \lesssim 260$ GeV, while the hadronic channel yields $30 \lesssim Δ^0 \lesssim 150$ GeV and $70 \lesssim Δ^{\pm} \lesssim 230$ GeV for $m_S = 70$ GeV. |
| title | LHC Mono-$W/Z$ Signatures as a Probe for Dark Matter Explanations of Astrophysical Excesses |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.07303 |