Palatable Leptoquark Scenarios for Lepton Flavor Violation in Exclusive $b\to s\ell_1\ell_2$ modes
Résumé
We examine various scenarios that involve a light $ \mathcal{O} $ (1 TeV) leptoquark state and select those which are compatible with the current experimental values for ℬ(B$_{s}$ → μμ), $ \mathrm{\mathcal{B}}{\left(B\to K\mu \mu \right)}_{\mathrm{large}-{q}^2},{R}_K={\mathrm{\mathcal{B}}}^{\prime}\left(B\to K\mu \mu \right)/{\mathrm{\mathcal{B}}}^{\prime}\left(B\to Kee\right) $ , and which lead to predictions consistent with other experimental data. We show that two such scenarios are phenomenologically plausible, namely the one with a doublet of scalar leptoquarks of hypercharge 1/6, and the one with a triplet of vector leptoquarks of hypercharge 2/3. We also argue that a model with a singlet scalar leptoquark of hypercharge 1/3 is not viable. Using the present experimental data as constraints, it is shown that the exclusive lepton flavor violating decays, ℬ(B$_{s}$ → μτ), ℬ(B → Kμτ) and ℬ(B → K$^{∗}$ μτ), can be as large as $ \mathcal{O}\left(1{0}^{-5}\right) $ .
Mots clés
Beyond Standard Model
Effective field theories
new physics
leptoquark: scalar
lepton: flavor: violation
bottom: semileptonic decay
strangeness: production
lepton: pair production
B/s0: leptonic decay
B/s0: rare decay
B/s0: branching ratio
B: semileptonic decay
B: branching ratio: ratio
B/s0 --> muon+ muon-
B --> K muon+ muon-
B --> K electron positron
B/s0 --> muon tau
B --> K muon tau
B --> K*(892) muon tau