Search for light scalar particles produced in Higgs boson decays in exclusive final states with two muons and two hadrons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910264489672704 |
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| author | CMS Collaboration |
| author_facet | CMS Collaboration |
| contents | A search for new scalar particles of $\mathcal{O}$(GeV) mass in exclusive final states with muons and light hadrons is presented. The analysis uses proton-proton collision data produced at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 201$-$2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The search targets exotic decays of the Higgs boson to a pair of prompt or long-lived identical scalar particles with proper decay lengths $cτ$ up to 100 mm and masses within the range of 0.4$-$2.0 GeV. This mass window corresponds to a unique parameter space where hadronic decays of these particles mostly result in a pair of light hadrons. The considered experimental signature is a collimated pair of muons and another pair of charged kaons or pions, each of which may be prompt or displaced. The analysis improves the sensitivity to very light scalar boson masses and demonstrates a novel approach to probe hadronic decays of light scalar bosons. Upper limits on the branching fraction of the Higgs boson to scalar bosons at the level of $\mathcal{O}$(10$^{-4}$) are obtained for several scalar boson masses between 0.4 and 2.0 GeV, with proper decay lengths of up to $\sim$1 mm. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_27875 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Search for light scalar particles produced in Higgs boson decays in exclusive final states with two muons and two hadrons in proton-proton collisions at $\sqrt{s}$ = 13 TeV CMS Collaboration High Energy Physics - Experiment A search for new scalar particles of $\mathcal{O}$(GeV) mass in exclusive final states with muons and light hadrons is presented. The analysis uses proton-proton collision data produced at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 201$-$2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. The search targets exotic decays of the Higgs boson to a pair of prompt or long-lived identical scalar particles with proper decay lengths $cτ$ up to 100 mm and masses within the range of 0.4$-$2.0 GeV. This mass window corresponds to a unique parameter space where hadronic decays of these particles mostly result in a pair of light hadrons. The considered experimental signature is a collimated pair of muons and another pair of charged kaons or pions, each of which may be prompt or displaced. The analysis improves the sensitivity to very light scalar boson masses and demonstrates a novel approach to probe hadronic decays of light scalar bosons. Upper limits on the branching fraction of the Higgs boson to scalar bosons at the level of $\mathcal{O}$(10$^{-4}$) are obtained for several scalar boson masses between 0.4 and 2.0 GeV, with proper decay lengths of up to $\sim$1 mm. |
| title | Search for light scalar particles produced in Higgs boson decays in exclusive final states with two muons and two hadrons in proton-proton collisions at $\sqrt{s}$ = 13 TeV |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2605.27875 |