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| Main Authors: | , , |
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| Format: | Preprint |
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2021
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| Online Access: | https://arxiv.org/abs/2111.02533 |
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| _version_ | 1866910547202539520 |
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| author | de Lima, Carlos Henrique Stolarski, Daniel Wu, Yongcheng |
| author_facet | de Lima, Carlos Henrique Stolarski, Daniel Wu, Yongcheng |
| contents | In this work, we study the status of negative coupling modifiers in extended Higgs sectors, focusing on the ratio of coupling modifiers that probes custodial symmetry violation $λ_{WZ} = κ_{W}/κ_{Z}$. Higgs sectors with multiplets larger than doublets are the only weakly coupled models that give tree-level modifications to $λ_{WZ}$, and we explore all such models allowed by the constraint from the $ρ$ parameter and perturbative unitarity. This class of models has a custodial symmetry violating potential, while the vacuum configuration preserves the symmetry. We apply precision measurements from ATLAS and CMS and show that each data set can exclude a vast set of models with $λ_{WZ} < 0$ at greater than 95\% confidence level. We give evidence that $λ_{WZ}<0$ is excluded in all weakly coupled models.
[Erratum for this work on page 19 changing our claims of complete exclusion of negative $λ_{WZ}$ to a softer version where only the minimal models are excluded.] |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2111_02533 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Status of negative coupling modifiers for extended Higgs sectors de Lima, Carlos Henrique Stolarski, Daniel Wu, Yongcheng High Energy Physics - Phenomenology In this work, we study the status of negative coupling modifiers in extended Higgs sectors, focusing on the ratio of coupling modifiers that probes custodial symmetry violation $λ_{WZ} = κ_{W}/κ_{Z}$. Higgs sectors with multiplets larger than doublets are the only weakly coupled models that give tree-level modifications to $λ_{WZ}$, and we explore all such models allowed by the constraint from the $ρ$ parameter and perturbative unitarity. This class of models has a custodial symmetry violating potential, while the vacuum configuration preserves the symmetry. We apply precision measurements from ATLAS and CMS and show that each data set can exclude a vast set of models with $λ_{WZ} < 0$ at greater than 95\% confidence level. We give evidence that $λ_{WZ}<0$ is excluded in all weakly coupled models. [Erratum for this work on page 19 changing our claims of complete exclusion of negative $λ_{WZ}$ to a softer version where only the minimal models are excluded.] |
| title | Status of negative coupling modifiers for extended Higgs sectors |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2111.02533 |