Vub is the smallest and least known of all CKM matrix elements; it is currently determined primarily through the exclusive process B→πν̄, and additional channels to determine it are welcomed by the community. We will present progress toward a lattice QCD determination of |Vub| from the B→ππν̄ process, where the ππ system is in a P-wave and features the ρ(770) resonance as an enhancement. After an overview of the theoretical framework, we will discuss some preliminary results.
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Leskovec et al. (2024) studied this question.
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