The effective field theory of low scale see-saw at colliders
Abstract We study the Standard Model effective field theory ($$\nu $$ ν SMEFT) extended with operators involving right-handed neutrinos, focussing on the regime where the right-handed neutrinos decay promptly on collider scales to a photon and a Standard Model neutrino. This scenario arises naturall...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-08-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | http://link.springer.com/article/10.1140/epjc/s10052-020-8339-2 |
| _version_ | 1818476642783199232 |
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| author | Anke Biekötter Mikael Chala Michael Spannowsky |
| author_facet | Anke Biekötter Mikael Chala Michael Spannowsky |
| author_sort | Anke Biekötter |
| collection | DOAJ |
| description | Abstract We study the Standard Model effective field theory ($$\nu $$ ν SMEFT) extended with operators involving right-handed neutrinos, focussing on the regime where the right-handed neutrinos decay promptly on collider scales to a photon and a Standard Model neutrino. This scenario arises naturally for right-handed neutrinos with masses of the order $$m_N \sim 0.1 \dots 10\, \,\text {GeV}$$ mN∼0.1⋯10GeV . We limit the relevant dimension-six operator coefficients using LEP and LHC searches with photons and missing energy in the final state as well as pion and tau decays. While bounds on new physics contributions are generally in the TeV scale for order one operator coefficients, some coefficients, however, remain very poorly constrained or even entirely evade bounds from current data. Consequently, we identify such weakly constrained scenarios and propose new searches for rare top and tau decays involving photons to probe potential new physics in the $$\nu $$ ν SMEFT parameter space. Our analysis highlights the importance of performing dedicated searches for new rare tau and top decays. |
| first_indexed | 2024-12-10T09:28:29Z |
| format | Article |
| id | doaj.art-e2390543555e436e8723b40dff00a858 |
| institution | Directory Open Access Journal |
| issn | 1434-6044 1434-6052 |
| language | English |
| last_indexed | 2024-12-10T09:28:29Z |
| publishDate | 2020-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-e2390543555e436e8723b40dff00a8582022-12-22T01:54:26ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60441434-60522020-08-0180811810.1140/epjc/s10052-020-8339-2The effective field theory of low scale see-saw at collidersAnke Biekötter0Mikael Chala1Michael Spannowsky2Department of Physics, Institute for Particle Physics Phenomenology, Durham UniversityCAFPE and Departamento de Física Teórica y del Cosmos, Universidad de GranadaDepartment of Physics, Institute for Particle Physics Phenomenology, Durham UniversityAbstract We study the Standard Model effective field theory ($$\nu $$ ν SMEFT) extended with operators involving right-handed neutrinos, focussing on the regime where the right-handed neutrinos decay promptly on collider scales to a photon and a Standard Model neutrino. This scenario arises naturally for right-handed neutrinos with masses of the order $$m_N \sim 0.1 \dots 10\, \,\text {GeV}$$ mN∼0.1⋯10GeV . We limit the relevant dimension-six operator coefficients using LEP and LHC searches with photons and missing energy in the final state as well as pion and tau decays. While bounds on new physics contributions are generally in the TeV scale for order one operator coefficients, some coefficients, however, remain very poorly constrained or even entirely evade bounds from current data. Consequently, we identify such weakly constrained scenarios and propose new searches for rare top and tau decays involving photons to probe potential new physics in the $$\nu $$ ν SMEFT parameter space. Our analysis highlights the importance of performing dedicated searches for new rare tau and top decays.http://link.springer.com/article/10.1140/epjc/s10052-020-8339-2 |
| spellingShingle | Anke Biekötter Mikael Chala Michael Spannowsky The effective field theory of low scale see-saw at colliders European Physical Journal C: Particles and Fields |
| title | The effective field theory of low scale see-saw at colliders |
| title_full | The effective field theory of low scale see-saw at colliders |
| title_fullStr | The effective field theory of low scale see-saw at colliders |
| title_full_unstemmed | The effective field theory of low scale see-saw at colliders |
| title_short | The effective field theory of low scale see-saw at colliders |
| title_sort | effective field theory of low scale see saw at colliders |
| url | http://link.springer.com/article/10.1140/epjc/s10052-020-8339-2 |
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