Abstract
Exclusive semileptonic b hadron decays (b → uℓν) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element Vub. Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT as a conduit to chart territory beyond the SM, we demonstrate that substantive new physics contributions in b → uℓν are necessarily linked to correlated effects in rare neutral-current b decays, neutral B meson mixing or high-mass Drell-Yan tails. We find that measurements of the latter processes strongly restrict the allowed deviations in the former. A complete set of tree-level mediators, originating from a perturbative ultraviolet model and matching at dimension 6, is thoroughly explored to support this assertion. As a showcase application, we examine the feasibility of a new physics interpretation of the recent tension in exclusive |Vub| extraction from B → Vℓν where V = (ρ, ω).
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Acknowledgments
We thank Méril Reboud for the useful comparison with [33]. This work received funding from the Swiss National Science Foundation (SNF) through the Eccellenza Professorial Fellowship “Flavor Physics at the High Energy Frontier” project number 186866. AG is also partially supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program, grant agreement 833280 (FLAY).
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Greljo, A., Salko, J., Smolkovič, A. et al. SMEFT restrictions on exclusive b → uℓν decays. J. High Energ. Phys. 2023, 23 (2023). https://doi.org/10.1007/JHEP11(2023)023
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DOI: https://doi.org/10.1007/JHEP11(2023)023