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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2212.11086 |
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| _version_ | 1866916201749282816 |
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| author | Lang, Martin S. Nierste, Ulrich |
| author_facet | Lang, Martin S. Nierste, Ulrich |
| contents | 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 $B_s \to μ^+ μ^-$ 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 $B_s \to μ^+ μ^-$, $b\to sγ$, and the Higgs masses. The $B_s - \bar B_s$ mixing amplitude is naturally suppressed in the model but can probe a portion of the parameter space with very heavy Higgs bosons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2212_11086 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | $B_s \to μ^+ μ^-$ in a Two-Higgs-Doublet Model with flavour-changing up-type Yukawa couplings Lang, Martin S. Nierste, Ulrich High Energy Physics - Phenomenology 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 $B_s \to μ^+ μ^-$ 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 $B_s \to μ^+ μ^-$, $b\to sγ$, and the Higgs masses. The $B_s - \bar B_s$ mixing amplitude is naturally suppressed in the model but can probe a portion of the parameter space with very heavy Higgs bosons. |
| title | $B_s \to μ^+ μ^-$ in a Two-Higgs-Doublet Model with flavour-changing up-type Yukawa couplings |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2212.11086 |