Towards a viable scalar interpretation of
| Autor: | Martti Raidal, Christian Spethmann, Sean Fraser, Luca Marzola, Carlo Marzo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
010308 nuclear & particles physics Physics beyond the Standard Model High Energy Physics::Phenomenology FOS: Physical sciences Scalar boson 01 natural sciences Computer Science::Digital Libraries Universality (dynamical systems) High Energy Physics - Phenomenology Theoretical physics High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Higgs boson Embedding Vector field Leptoquark High Energy Physics::Experiment 010306 general physics Lepton |
| Zdroj: | Physical Review |
| Popis: | Recent measurements of semileptonic B-meson decays seemingly imply violations of lepton flavor universality beyond the Standard Model predictions. With three-level explanations based on extended Higgs sectors being strongly challenged by the measurements of the $B_c^-$ lifetime, new theories invoking leptoquark or vector fields appear as the only feasible answer. However, in this work we show that simple scalar extensions of the Standard Model still offer a possible solution to the $B$ physics puzzle, owing to sizeable loop-level corrections which mimic the effects of new vector contributions. Considering a simplified model characterised by a charged and a neutral scalar particle, we verify the compatibility of the observed $R_{D^{(*)}}$ signal with the relevant collider bounds. We also study an embedding of the simplified model into a three-Higgs-doublet framework, and investigate its main phenomenological constraints. Comment: 15 pages, 12 figures. v2: References updated, larger captions for most of the plots. Version to appear on PRD |
| Databáze: | OpenAIRE |
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