Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios
Abstract Models with an extended Higgs sector open up the phenomenological possibility of additional scalars, beyond the SM-like boson observed by the LHC, with mass at or below the electroweak scale. Such scenarios are in particular viable in the presence of electroweak-singlet spin-0 fields, as ex...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2022-02-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-022-09985-5 |
| _version_ | 1818870927071379456 |
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| author | Florian Domingo Sebastian Paßehr |
| author_facet | Florian Domingo Sebastian Paßehr |
| author_sort | Florian Domingo |
| collection | DOAJ |
| description | Abstract Models with an extended Higgs sector open up the phenomenological possibility of additional scalars, beyond the SM-like boson observed by the LHC, with mass at or below the electroweak scale. Such scenarios are in particular viable in the presence of electroweak-singlet spin-0 fields, as expected for instance in the context of the NMSSM. Given that the size of radiative corrections can substantially affect the Higgs potential, a negative squared mass at the tree level does not necessarily yield a tachyonic spectrum at the physical level, but only indicates a failure of the tree-level description for calculational purposes. We explain how to tackle this technical issue in the example of the NMSSM, in scenarios with light $$\mathcal {CP}$$ CP -odd or $$\mathcal {CP}$$ CP -even singlet-dominated states and show how loop corrections to the Higgs masses and decay widths can be derived with the regularized Lagrangian. We further explore how the same flexibility in the definition of tree-level parameters can be exploited to circumvent large deviations of the tree-level spectrum from the kinematical setup in Higgs decays, or to estimate the theoretical uncertainty associated with the discrepancy between tree-level and physical Higgs spectra. The latter is of particular relevance for the properties of the SM-like Higgs boson in supersymmetry-inspired models. |
| first_indexed | 2024-12-19T12:14:47Z |
| format | Article |
| id | doaj.art-35230df6804c4c398f0b7d1fe452c7b4 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-19T12:14:47Z |
| publishDate | 2022-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-35230df6804c4c398f0b7d1fe452c7b42022-12-21T20:22:02ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522022-02-0182212510.1140/epjc/s10052-022-09985-5Curing tachyonic tree-level syndrome in NMSSM light-singlet scenariosFlorian Domingo0Sebastian Paßehr1Bethe Center for Theoretical Physics and Physikalisches, Institut der Universität BonnInstitute for Theoretical Particle Physics and Cosmology, RWTH Aachen UniversityAbstract Models with an extended Higgs sector open up the phenomenological possibility of additional scalars, beyond the SM-like boson observed by the LHC, with mass at or below the electroweak scale. Such scenarios are in particular viable in the presence of electroweak-singlet spin-0 fields, as expected for instance in the context of the NMSSM. Given that the size of radiative corrections can substantially affect the Higgs potential, a negative squared mass at the tree level does not necessarily yield a tachyonic spectrum at the physical level, but only indicates a failure of the tree-level description for calculational purposes. We explain how to tackle this technical issue in the example of the NMSSM, in scenarios with light $$\mathcal {CP}$$ CP -odd or $$\mathcal {CP}$$ CP -even singlet-dominated states and show how loop corrections to the Higgs masses and decay widths can be derived with the regularized Lagrangian. We further explore how the same flexibility in the definition of tree-level parameters can be exploited to circumvent large deviations of the tree-level spectrum from the kinematical setup in Higgs decays, or to estimate the theoretical uncertainty associated with the discrepancy between tree-level and physical Higgs spectra. The latter is of particular relevance for the properties of the SM-like Higgs boson in supersymmetry-inspired models.https://doi.org/10.1140/epjc/s10052-022-09985-5 |
| spellingShingle | Florian Domingo Sebastian Paßehr Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios European Physical Journal C: Particles and Fields |
| title | Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios |
| title_full | Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios |
| title_fullStr | Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios |
| title_full_unstemmed | Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios |
| title_short | Curing tachyonic tree-level syndrome in NMSSM light-singlet scenarios |
| title_sort | curing tachyonic tree level syndrome in nmssm light singlet scenarios |
| url | https://doi.org/10.1140/epjc/s10052-022-09985-5 |
| work_keys_str_mv | AT floriandomingo curingtachyonictreelevelsyndromeinnmssmlightsingletscenarios AT sebastianpaßehr curingtachyonictreelevelsyndromeinnmssmlightsingletscenarios |