Probing a scalar singlet-triplet extension of the standard model via vector boson fusion at a muon collider
Year: 2024
Type: article
Abstract: In this article, we investigate the Y = 0 S U ( 2 ) scalar triplet and Z 2 -odd scalar singlet extension of the standard model (SM). Here, the triplet charged Higgs boson decays to Z W ± , breaking the custodial symmetry at the tree level, proportional to the triplet vacuum expectation value, while the singlet provides the dark matter (DM) relic. The triplet neutral Higgs boson ( T 0 ) can decay fully invisibly owing to the triplet-singlet portal coupling λ s t . The other SM Higgs portal couplings λ h t , λ h s are constrained by the Higgs boson to diphoton observations, and the dark matter relic and direct searches as well as invisible Higgs decay bounds, respectively. For a cleaner signature, we indulge in a futuristic multi-TeV muon collider (MuC) to probe both the triplet scalars ( T ± , T 0 ) via vector boson fusion with forward muon tagging, at the center-of-mass energies of 3 and 10 TeV. The analysis is comprised of a traditional cut-based approach and a boosted decision tree (BDT) classifier, where the latter is more effective for lower energies. With large missing energy contributions to the final states from combinations of DM mass and λ s t , the 3 TeV MuC is projected to probe triplet scalar masses of 450 GeV with the BDT classifier. The 10 TeV MuC can pinpoint the custodial symmetry breaking T ± → Z W ± → 3 -lepton decay up to 800 GeV of triplet scalar mass from cut-based analysis, with λ s t as low as 1.5 being adequate. Published by the American Physical Society 2024
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G1721801740, G5228402632, G6643164877
OpenAlex ID: W4405722546