Two-Loop Contributions to the Anomalous Chromomagnetic Dipole Moment of the Top Quark in Two-Higgs-Doublet Models
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909177493848064 |
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| author | Bisal, Subhadip |
| author_facet | Bisal, Subhadip |
| contents | We present the analytical results for the anomalous chromomagnetic moment of a quark at the one-loop and two-loop levels through model-independent parameterizations, considering the external gluon to be off-shell. Then, we consider different types of two-Higgs doublet models with the momentum transfer of the external gluon, $q^2 = \pm M_Z^2$, and $0$, for the numerical evaluations thereof for the top quark. We find that the contributions in the two-Higgs-doublet models are on the order of $\mathcal{O}(10^{-3})$ at the one-loop level and $\mathcal{O}(10^{-4})$ at the two-loop level, where the one-loop and two-loop contributions interfere destructively, resulting in the overall contributions being on the order of $\mathcal{O}(10^{-3})$ with a positive sign. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14065 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Two-Loop Contributions to the Anomalous Chromomagnetic Dipole Moment of the Top Quark in Two-Higgs-Doublet Models Bisal, Subhadip High Energy Physics - Phenomenology We present the analytical results for the anomalous chromomagnetic moment of a quark at the one-loop and two-loop levels through model-independent parameterizations, considering the external gluon to be off-shell. Then, we consider different types of two-Higgs doublet models with the momentum transfer of the external gluon, $q^2 = \pm M_Z^2$, and $0$, for the numerical evaluations thereof for the top quark. We find that the contributions in the two-Higgs-doublet models are on the order of $\mathcal{O}(10^{-3})$ at the one-loop level and $\mathcal{O}(10^{-4})$ at the two-loop level, where the one-loop and two-loop contributions interfere destructively, resulting in the overall contributions being on the order of $\mathcal{O}(10^{-3})$ with a positive sign. |
| title | Two-Loop Contributions to the Anomalous Chromomagnetic Dipole Moment of the Top Quark in Two-Higgs-Doublet Models |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2404.14065 |