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| Home > Publications database > Search for a pseudoscalar boson produced in decays of the 125 GeV Higgs boson and decaying into $τ$ leptons |
| Conference Presentation | PUBDB-2019-02011 |
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2019
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Please use a persistent id in citations: doi:10.3204/PUBDB-2019-02011
Abstract: Several theories extending the Standard Model (SM) have predicted the existence of addi- tional Higgs bosons. Searches for these extra Higgs bosons have focused primarily on general two Higgs doublet models (2HDM) as well as the minimal supersymmetric standard model, whose Higgs sector corresponds to the 2HDM. However, models where the two Higgs doublets are extended by one additional Higgs singlet complex field (2HD+1S) are consistent with SM measurements and constraints from searches for additional Higgs bosons. Moreover, 2HD+1 models such as the next-to-minimal supersymmetric (NMSSM) models can solve the so-called μ-problem of the MSSM and comfortably accommodate the 125 GeV Higgs boson in the mass spectrum. The Higgs sector of the 2HD+1S models contains seven physical states, namely three CP-even, two CP-odd and two charged bosons. There exist scenarios where the lightest pseudoscalar boson (a1 ) can have a mass in the range 2m τ < m a 1 < 2m b , and this case becomes potentially accessible in the channel H(125) → a1a1 → 4τ . This analysis presents a search for pairs of very light pseudoscalar bosons, in the mass range between 4 and 15 GeV, produced in the decay of the 125 GeV Higgs boson, and each decaying to pairs of τ leptons. The study thus complements recent searches for H(125) → a 1 a 1 decay performed in the rest of the possible channels and in a different m a 1 region. This search is based on proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 35.9 fb −1 .
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