A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections
Abstract In the type-I seesaw mechanism the Casas-Ibarra (CI) parametrization provides a convenient description of the Dirac neutrino mass matrix in terms of the light and heavy Majorana neutrino masses, the lepton flavor mixing matrix U and an unknown complex orthogonal matrix O. If O is assumed to...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2020-04-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP04(2020)179 |
| _version_ | 1828465028714463232 |
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| author | Zhi-zhong Xing Di Zhang |
| author_facet | Zhi-zhong Xing Di Zhang |
| author_sort | Zhi-zhong Xing |
| collection | DOAJ |
| description | Abstract In the type-I seesaw mechanism the Casas-Ibarra (CI) parametrization provides a convenient description of the Dirac neutrino mass matrix in terms of the light and heavy Majorana neutrino masses, the lepton flavor mixing matrix U and an unknown complex orthogonal matrix O. If O is assumed to be real, it will be impossible to generate unflavored thermal leptogenesis via the lepton-number-violating and CP-violating decays of the lightest heavy Majorana neutrino. We find that this observation can be invalidated after small but unavoidable quantum corrections to the CI parametrization are taken into account with the help of the one-loop renormalization-group equations (RGEs) between the seesaw and electroweak scales. We illustrate a novel and viable unflavored leptogenesis scenario of this kind based on the RGEs in the seesaw-extended standard model, and show its direct link to the CP-violating phases of U at low energies. |
| first_indexed | 2024-12-11T03:24:54Z |
| format | Article |
| id | doaj.art-124ef66ce4504df3953f105d7190278e |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-11T03:24:54Z |
| publishDate | 2020-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-124ef66ce4504df3953f105d7190278e2022-12-22T01:22:32ZengSpringerOpenJournal of High Energy Physics1029-84792020-04-012020411610.1007/JHEP04(2020)179A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum correctionsZhi-zhong Xing0Di Zhang1Institute of High Energy Physics and School of Physical Sciences, University of Chinese Academy of SciencesInstitute of High Energy Physics and School of Physical Sciences, University of Chinese Academy of SciencesAbstract In the type-I seesaw mechanism the Casas-Ibarra (CI) parametrization provides a convenient description of the Dirac neutrino mass matrix in terms of the light and heavy Majorana neutrino masses, the lepton flavor mixing matrix U and an unknown complex orthogonal matrix O. If O is assumed to be real, it will be impossible to generate unflavored thermal leptogenesis via the lepton-number-violating and CP-violating decays of the lightest heavy Majorana neutrino. We find that this observation can be invalidated after small but unavoidable quantum corrections to the CI parametrization are taken into account with the help of the one-loop renormalization-group equations (RGEs) between the seesaw and electroweak scales. We illustrate a novel and viable unflavored leptogenesis scenario of this kind based on the RGEs in the seesaw-extended standard model, and show its direct link to the CP-violating phases of U at low energies.http://link.springer.com/article/10.1007/JHEP04(2020)179CP violationNeutrino PhysicsRenormalization Group |
| spellingShingle | Zhi-zhong Xing Di Zhang A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections Journal of High Energy Physics CP violation Neutrino Physics Renormalization Group |
| title | A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections |
| title_full | A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections |
| title_fullStr | A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections |
| title_full_unstemmed | A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections |
| title_short | A direct link between unflavored leptogenesis and low-energy CP violation via the one-loop quantum corrections |
| title_sort | direct link between unflavored leptogenesis and low energy cp violation via the one loop quantum corrections |
| topic | CP violation Neutrino Physics Renormalization Group |
| url | http://link.springer.com/article/10.1007/JHEP04(2020)179 |
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