Variant Nelson-Barr mechanism with minimal flavor violation
Abstract Within the general framework of using spontaneous CP violation to solve the strong CP problem, we construct a variant Nelson-Barr model in which the Standard Model (SM) quark contribution to the strong CP phase is cancelled by new heavy QCD-charged fermions. This cancellation is ensured by...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-04-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP04(2023)063 |
| _version_ | 1797769686256975872 |
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| author | Yang Bai George N. Wojcik |
| author_facet | Yang Bai George N. Wojcik |
| author_sort | Yang Bai |
| collection | DOAJ |
| description | Abstract Within the general framework of using spontaneous CP violation to solve the strong CP problem, we construct a variant Nelson-Barr model in which the Standard Model (SM) quark contribution to the strong CP phase is cancelled by new heavy QCD-charged fermions. This cancellation is ensured by choosing conjugate representations for the new colored states under the same global flavor symmetry of SM quarks. Choosing the global flavor symmetry to be that of minimal flavor violation, we suppress higher-order corrections to the strong CP phase to well below current experimental constraints. More than two dozen massless Goldstone bosons emerge from spontaneous flavor symmetry breaking, which yield strong astrophysical constraints on the symmetry breaking scale. In the early universe, the Goldstone bosons can be thermally produced from their interactions with the heavy colored fermions and contribute to ∆N eff at a measurable level. As a function of reheating temperature, the predicted ∆N eff shows an interesting plateau behavior we dub the “flavor stairway”, which encodes information about the SM quark flavor structure. |
| first_indexed | 2024-03-12T21:11:37Z |
| format | Article |
| id | doaj.art-15ef6bbcc0c14e5b8bb65a5aaf875df7 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-12T21:11:37Z |
| publishDate | 2023-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-15ef6bbcc0c14e5b8bb65a5aaf875df72023-07-30T11:04:47ZengSpringerOpenJournal of High Energy Physics1029-84792023-04-012023413810.1007/JHEP04(2023)063Variant Nelson-Barr mechanism with minimal flavor violationYang Bai0George N. Wojcik1Department of Physics, University of Wisconsin-MadisonDepartment of Physics, University of Wisconsin-MadisonAbstract Within the general framework of using spontaneous CP violation to solve the strong CP problem, we construct a variant Nelson-Barr model in which the Standard Model (SM) quark contribution to the strong CP phase is cancelled by new heavy QCD-charged fermions. This cancellation is ensured by choosing conjugate representations for the new colored states under the same global flavor symmetry of SM quarks. Choosing the global flavor symmetry to be that of minimal flavor violation, we suppress higher-order corrections to the strong CP phase to well below current experimental constraints. More than two dozen massless Goldstone bosons emerge from spontaneous flavor symmetry breaking, which yield strong astrophysical constraints on the symmetry breaking scale. In the early universe, the Goldstone bosons can be thermally produced from their interactions with the heavy colored fermions and contribute to ∆N eff at a measurable level. As a function of reheating temperature, the predicted ∆N eff shows an interesting plateau behavior we dub the “flavor stairway”, which encodes information about the SM quark flavor structure.https://doi.org/10.1007/JHEP04(2023)063Axions and ALPsCosmology of Theories BSMTheories of FlavourVector-Like Fermions |
| spellingShingle | Yang Bai George N. Wojcik Variant Nelson-Barr mechanism with minimal flavor violation Journal of High Energy Physics Axions and ALPs Cosmology of Theories BSM Theories of Flavour Vector-Like Fermions |
| title | Variant Nelson-Barr mechanism with minimal flavor violation |
| title_full | Variant Nelson-Barr mechanism with minimal flavor violation |
| title_fullStr | Variant Nelson-Barr mechanism with minimal flavor violation |
| title_full_unstemmed | Variant Nelson-Barr mechanism with minimal flavor violation |
| title_short | Variant Nelson-Barr mechanism with minimal flavor violation |
| title_sort | variant nelson barr mechanism with minimal flavor violation |
| topic | Axions and ALPs Cosmology of Theories BSM Theories of Flavour Vector-Like Fermions |
| url | https://doi.org/10.1007/JHEP04(2023)063 |
| work_keys_str_mv | AT yangbai variantnelsonbarrmechanismwithminimalflavorviolation AT georgenwojcik variantnelsonbarrmechanismwithminimalflavorviolation |