Abstract
The Standard Model extended with a complex singlet scalar (cxSM) can admit a strong first order electroweak phase transition (SFOEWPT) as needed for electroweak baryogenesis and provide a dark matter (DM) candidate. The presence of both a DM candidate and a singlet-like scalar that mixes with the Standard Model Higgs boson leads to the possibility of a \( b\overline{b} \) + MET final state in pp collisions. Focusing on this channel, we analyze the prospective reach at the Large Hadron Collider (LHC) for a heavy singlet-like scalar in regions of cxSM parameter space compatible with a SFOEWPT and DM phenomenology. We identify this parameter space while implementing current constraints from electroweak precision observable and Higgs boson property measurements as well as those implied by LHC heavy resonance searches. Implementing a proposed search strategy, we find that the heavy scalar and DM candidate can be probed up to 1 TeV and 450 GeV at 2σ level respectively.
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Acknowledgments
M.J. Ramsey-Musolf and W. Zhang were supported in part by the National Natural Science Foundation of China under grant no. 11975150 and by the Ministry of Science and Technology of China under grant no. WQ20183100522. M. J. Ramsey-Musolf also gratefully acknowledges support under the Double First Class Plan of the Shanghai Jiao Tong University and sponsorship from Shanghai Tang Junyuan Education Foundation. Y. Cai received financial support from the China Scholarships Council program. L. Zhang’s work was supported by the National Science Fund of China for Excellent Young Scholars under grant number 12122507.
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Zhang, W., Cai, Y., Ramsey-Musolf, M.J. et al. Testing complex singlet scalar cosmology at the Large Hadron Collider. J. High Energ. Phys. 2024, 51 (2024). https://doi.org/10.1007/JHEP01(2024)051
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DOI: https://doi.org/10.1007/JHEP01(2024)051