New Physics in B decays
CERN Theory Division, CH–1211 Geneva 23, Switzerland
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Published online: 26 April 2016
While the LHC did not observe direct evidence for physics beyond the standard model, indirect hints for new physics were uncovered in the flavour sector in the decays B → K*µ+ µ−, B → Kµ+ µ−/B → Ke+e−, Bs → øµ+µ−, B → D(*) τv and h → τ±µ∓. Each observable deviates from the SM predictions at the 2 − 3σ level only, but combining all b → sµ+µ− data via a global fit, one finds 4 − 5 σ difference for NP compared to the SM and combining B → D* τv with B → Dτv one obtains 3:9 σ.
While B → D(*) τv and h → τv can be naturally explained by an extended Higgs sector, the b → sµ+µ− anomalies point at a Z′ gauge boson. However, it is also possible to explain B → D(*) τv and b → sµ+ µ− simultaneously with leptoquarks while their effect in h → τ±µ∓ is far too small to account for current data. Combining a 2HDM with a gauged Lµ − Lτ symmetry allows for explaining the b → sµ+ µ− anomalies in combination with h → τ±µ∓, predicting interesting correlations with τ → 3µ. In the light of these deviations from the SM we also discuss the possibilities of observing lepton flavour violating B decays (e.g. B → K(*) τ±µ∓ and Bs → τ±µ∓).
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