Beyond the Standard Model Higgs sectors
<p>Although the experimentally detected 125 GeV spin-0 resonance has properties very close to the one predicted by the Standard Model, it is still possible that the Higgs sector in nature is not SM-like. In this work we will discuss two projects investigating the experimental validity of THDM...
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| Format: | Thesis |
| Language: | English |
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2019
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| Summary: | <p>Although the experimentally detected 125 GeV spin-0 resonance has properties very close to the one predicted by the Standard Model, it is still possible that the Higgs sector in nature is not SM-like. In this work we will discuss two projects investigating the experimental validity of THDM (Two Higgs Doublet Model) and THDM+S models.</p>
<p>In the first project we demonstrate that the peak (2.3 σ) at 95 GeV as recently seen by CMS collaboration in the di-photon final state can be explained within the type-I THDM by means of fermiophobic CP-even Higgs boson H. In this context we discuss the other Higgs anomalies such as LEP excess in Higgsstrahlung and observation of enhanced rates in tt¯h at the LHC, showing that parameters capable of
explaining the CMS di-photon excess can address these deviations as well while at the
same time being compatible with LHC Run-I Higgs signal strength measurements.</p>
<p>In the second project we investigate experimental bounds on the exotic Higgs decays into the pair of light pseudoscalars devoting special attention to the mass regions of [3,4] GeV and [9,11] GeV where the pseudoscalar can mix with the QCD bound states η<sub>c</sub> and η<sub>b</sub> respectively. We find that mixing effects can modify the total decay width of the pseudoscalar and therefore have an impact on the derived bounds. We present exclusion limits on μ<sub>h</sub>BR(h → aa) and μ<sub>h</sub> BR(h → aZ) at a 95% C.L. in the framework of THDM+S model in order to facilitate the comparison with the recent results by the CMS collaboration.</p>
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