B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings
Abstract We present a Two-Higgs-Doublet Model in which the structure of the quark Yukawa matrices is governed by three spurions breaking the flavour symmetries of the quark Yukawa sector. The model naturally suppresses flavour-changing neutral current (FCNC) amplitudes in the down-type sector, but p...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-04-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP04(2024)047 |
| _version_ | 1797209531022835712 |
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| author | Martin S. Lang Ulrich Nierste |
| author_facet | Martin S. Lang Ulrich Nierste |
| author_sort | Martin S. Lang |
| collection | DOAJ |
| description | Abstract We present a Two-Higgs-Doublet Model in which the structure of the quark Yukawa matrices is governed by three spurions breaking the flavour symmetries of the quark Yukawa sector. The model naturally suppresses flavour-changing neutral current (FCNC) amplitudes in the down-type sector, but permits sizable FCNC couplings in the up sector. We calculate the branching ratio of B s → μ + μ − to leading and next-to-leading order of QCD for the case with FCNC couplings of the heavy neutral Higgs bosons to up-type quarks and verify that all counterterms follow the pattern dictated by the spurion expansion of the Yukawa matrices. We find correlations between B s → μ + μ − , b → sγ, and the Higgs masses. The $${B}_{s}-{\overline{B} }_{s}$$ mixing amplitude is naturally suppressed in the model but can probe a portion of the parameter space with very heavy Higgs bosons. |
| first_indexed | 2024-04-24T09:56:10Z |
| format | Article |
| id | doaj.art-270641bfb25a4e55a3f39cec2a1f5b1d |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-24T09:56:10Z |
| publishDate | 2024-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-270641bfb25a4e55a3f39cec2a1f5b1d2024-04-14T11:06:13ZengSpringerOpenJournal of High Energy Physics1029-84792024-04-012024413410.1007/JHEP04(2024)047B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplingsMartin S. Lang0Ulrich Nierste1Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology (KIT)Institute for Theoretical Particle Physics, Karlsruhe Institute of Technology (KIT)Abstract We present a Two-Higgs-Doublet Model in which the structure of the quark Yukawa matrices is governed by three spurions breaking the flavour symmetries of the quark Yukawa sector. The model naturally suppresses flavour-changing neutral current (FCNC) amplitudes in the down-type sector, but permits sizable FCNC couplings in the up sector. We calculate the branching ratio of B s → μ + μ − to leading and next-to-leading order of QCD for the case with FCNC couplings of the heavy neutral Higgs bosons to up-type quarks and verify that all counterterms follow the pattern dictated by the spurion expansion of the Yukawa matrices. We find correlations between B s → μ + μ − , b → sγ, and the Higgs masses. The $${B}_{s}-{\overline{B} }_{s}$$ mixing amplitude is naturally suppressed in the model but can probe a portion of the parameter space with very heavy Higgs bosons.https://doi.org/10.1007/JHEP04(2024)047Bottom QuarksMulti-Higgs ModelsRare DecaysSpecific BSM Phenomenology |
| spellingShingle | Martin S. Lang Ulrich Nierste B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings Journal of High Energy Physics Bottom Quarks Multi-Higgs Models Rare Decays Specific BSM Phenomenology |
| title | B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings |
| title_full | B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings |
| title_fullStr | B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings |
| title_full_unstemmed | B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings |
| title_short | B s → μ + μ − in a two-Higgs-doublet model with flavour-changing up-type Yukawa couplings |
| title_sort | b s μ μ in a two higgs doublet model with flavour changing up type yukawa couplings |
| topic | Bottom Quarks Multi-Higgs Models Rare Decays Specific BSM Phenomenology |
| url | https://doi.org/10.1007/JHEP04(2024)047 |
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