Investigating two-loop effects for first-order electroweak phase transitions
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866912004836425728 |
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| author | Niemi, Lauri Tenkanen, Tuomas V. I. |
| author_facet | Niemi, Lauri Tenkanen, Tuomas V. I. |
| contents | We study first-order electroweak phase transitions in the real-singlet extended Standard Model, for which non-zero mixing between the Higgs and the singlet can efficiently strengthen the transitions. We perform large-scale parameter space scans of the model using two-loop effective potential at next-to-next-to leading order in the high-temperature expansion, greatly improving description of phase transition thermodynamics over existing one-loop studies. We find that 1) two-loop corrections to the effective potential lead to narrower regions of strong first-order transitions and significantly smaller critical temperatures, 2) transitions involving a discontinuity in the singlet expectation value are significantly stronger at two-loop order, 3) high-temperature expansion is accurate for a wide range of parameter space that allows strong transitions, although it is less reliable for the very strongest transitions. These findings suggest revisiting past studies that connect the possibility of a first-order electroweak phase transition with future collider phenomenology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15912 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Investigating two-loop effects for first-order electroweak phase transitions Niemi, Lauri Tenkanen, Tuomas V. I. High Energy Physics - Phenomenology We study first-order electroweak phase transitions in the real-singlet extended Standard Model, for which non-zero mixing between the Higgs and the singlet can efficiently strengthen the transitions. We perform large-scale parameter space scans of the model using two-loop effective potential at next-to-next-to leading order in the high-temperature expansion, greatly improving description of phase transition thermodynamics over existing one-loop studies. We find that 1) two-loop corrections to the effective potential lead to narrower regions of strong first-order transitions and significantly smaller critical temperatures, 2) transitions involving a discontinuity in the singlet expectation value are significantly stronger at two-loop order, 3) high-temperature expansion is accurate for a wide range of parameter space that allows strong transitions, although it is less reliable for the very strongest transitions. These findings suggest revisiting past studies that connect the possibility of a first-order electroweak phase transition with future collider phenomenology. |
| title | Investigating two-loop effects for first-order electroweak phase transitions |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2408.15912 |