Speaker
Description
Observations of lepton flavour universality violating effects may hint at new physics, prompting analysis of the phenomenology for models with new heavy mediators of these effects, such as a $Z’$. A new physics field coupling to di-muon pairs may explain the anomalous B-meson decay measurements, including measurements of $b\rightarrow s\mu ^+ \mu ^-$ with the 2022 LHCb reanalysis of lepton flavour universality observables $R_K$ and $R_{K*}$. However, the reanalysis also poses the possibility of similar strength new physics couplings to di-electron pairs. These new interactions are naturally described on a TeV scale in the language of a dimension-6 SMEFT, with operators constrained to their most likely strengths by fits to data. We compare the statistical likelihood of couplings to di-muon and di-electron pairs, revealing new bounds for fits of a class of anomaly-free models which span scenarios encompassing dominant couplings for electrons to compare with muons. Pertinent measurements lead us to a close-to-optimal fit for a $3B_3-L_e-2L_{\mu}$ model, allowing us to draw conclusions about the likelihood of lepton flavour universality effects in this class of models.
| Are you happy for your talk to be recorded? | Yes |
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| Please select the most relevant category | Beyond Standard Model |
| Other category: | Flavour phenomenology |
| Would you be interested in receiving feedback on your presentation? | Yes |
