Integrating out new fermions at one loop
Abstract We present the fermionic universal one-loop effective action obtained by integrating out heavy vector-like fermions at one loop using functional techniques. Even though previous approaches are able to handle integrating out heavy fermions with non-chiral interactions, i.e. vanishing γ 5 int...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP01(2021)049 |
| _version_ | 1818595683208265728 |
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| author | Andrei Angelescu Peisi Huang |
| author_facet | Andrei Angelescu Peisi Huang |
| author_sort | Andrei Angelescu |
| collection | DOAJ |
| description | Abstract We present the fermionic universal one-loop effective action obtained by integrating out heavy vector-like fermions at one loop using functional techniques. Even though previous approaches are able to handle integrating out heavy fermions with non-chiral interactions, i.e. vanishing γ 5 interaction terms, the computations proceed in a tedious manner that obscures a physical interpretation. We show how directly tackling the fermionic functional determinant not only allows for a much simpler and transparent computation, but is also able to account for chiral interaction terms in a simple, algorithmic way. Finally, we apply the obtained results to integrate out at one loop the vector-like fermions appearing in a toy model and in a fermionic model that exhibits strong cosmological phase transitions. |
| first_indexed | 2024-12-16T11:19:54Z |
| format | Article |
| id | doaj.art-22d46664c05e4bc2b3ffd3d3b77a636b |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-16T11:19:54Z |
| publishDate | 2021-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-22d46664c05e4bc2b3ffd3d3b77a636b2022-12-21T22:33:29ZengSpringerOpenJournal of High Energy Physics1029-84792021-01-012021113510.1007/JHEP01(2021)049Integrating out new fermions at one loopAndrei Angelescu0Peisi Huang1Department of Physics and Astronomy, University of Nebraska-LincolnDepartment of Physics and Astronomy, University of Nebraska-LincolnAbstract We present the fermionic universal one-loop effective action obtained by integrating out heavy vector-like fermions at one loop using functional techniques. Even though previous approaches are able to handle integrating out heavy fermions with non-chiral interactions, i.e. vanishing γ 5 interaction terms, the computations proceed in a tedious manner that obscures a physical interpretation. We show how directly tackling the fermionic functional determinant not only allows for a much simpler and transparent computation, but is also able to account for chiral interaction terms in a simple, algorithmic way. Finally, we apply the obtained results to integrate out at one loop the vector-like fermions appearing in a toy model and in a fermionic model that exhibits strong cosmological phase transitions.https://doi.org/10.1007/JHEP01(2021)049Beyond Standard ModelEffective Field Theories |
| spellingShingle | Andrei Angelescu Peisi Huang Integrating out new fermions at one loop Journal of High Energy Physics Beyond Standard Model Effective Field Theories |
| title | Integrating out new fermions at one loop |
| title_full | Integrating out new fermions at one loop |
| title_fullStr | Integrating out new fermions at one loop |
| title_full_unstemmed | Integrating out new fermions at one loop |
| title_short | Integrating out new fermions at one loop |
| title_sort | integrating out new fermions at one loop |
| topic | Beyond Standard Model Effective Field Theories |
| url | https://doi.org/10.1007/JHEP01(2021)049 |
| work_keys_str_mv | AT andreiangelescu integratingoutnewfermionsatoneloop AT peisihuang integratingoutnewfermionsatoneloop |