Probing a scalar singlet-triplet extension of the Standard Model via VBF at the Muon Collider
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| Format: | Preprint |
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2024
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| _version_ | 1866929533469327360 |
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| author | Bandyopadhyay, Priyotosh Parashar, Snehashis |
| author_facet | Bandyopadhyay, Priyotosh Parashar, Snehashis |
| contents | In this article, we investigate the $Y=0$ $SU(2)$ scalar triplet and $Z_2$-odd scalar singlet extension of the Standard Model (SM). Here, the triplet charged Higgs boson decays to $ZW^\pm$, breaking the custodial symmetry at the tree-level, proportional to the triplet vev, while the singlet provides the dark matter (DM) relic. The triplet neutral Higgs ($T^0$) can decay fully invisibly owing to the triplet-singlet portal coupling $λ_{st}$. The other SM Higgs portal couplings $λ_{ht}, λ_{hs}$ are constrained by the Higgs to di-photon 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^\pm, T^0 $) via vector boson fusion with Forward muon tagging, at the centre-of-mass energies of 3 TeV and 10 TeV. The analysis is comprised of a traditional cut-based approach and a 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 $λ_{st}$, 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 $T^\pm \to ZW^\pm \to 3$-lepton decay up to 800 GeV of triplet scalar mass from cut-based analysis, with $λ_{st}$ as low as 1.5 being adequate. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_06298 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing a scalar singlet-triplet extension of the Standard Model via VBF at the Muon Collider Bandyopadhyay, Priyotosh Parashar, Snehashis High Energy Physics - Phenomenology In this article, we investigate the $Y=0$ $SU(2)$ scalar triplet and $Z_2$-odd scalar singlet extension of the Standard Model (SM). Here, the triplet charged Higgs boson decays to $ZW^\pm$, breaking the custodial symmetry at the tree-level, proportional to the triplet vev, while the singlet provides the dark matter (DM) relic. The triplet neutral Higgs ($T^0$) can decay fully invisibly owing to the triplet-singlet portal coupling $λ_{st}$. The other SM Higgs portal couplings $λ_{ht}, λ_{hs}$ are constrained by the Higgs to di-photon 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^\pm, T^0 $) via vector boson fusion with Forward muon tagging, at the centre-of-mass energies of 3 TeV and 10 TeV. The analysis is comprised of a traditional cut-based approach and a 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 $λ_{st}$, 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 $T^\pm \to ZW^\pm \to 3$-lepton decay up to 800 GeV of triplet scalar mass from cut-based analysis, with $λ_{st}$ as low as 1.5 being adequate. |
| title | Probing a scalar singlet-triplet extension of the Standard Model via VBF at the Muon Collider |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2410.06298 |