Summary
This paper reports the first lattice QCD calculation of the form factors governing B_c meson semileptonic decay to J/ψ, employing highly improved staggered quark actions on MILC gauge configurations with full q² range coverage. By mapping heavy quark mass dependence and performing continuum limit extrapolation, the authors achieve a 7% uncertainty on the differential decay rate and derive a branching fraction that enables experimental measurements to constrain the CKM matrix element V_cb with improved precision.
UK applicability
This theoretical nuclear and particle physics calculation has no direct applicability to UK farming systems, soil health, nutrient density, or human nutrition — it is outside the scope of Vitagri's Pulse Brain research domain and appears to have been indexed in error.
Key measures
B_c → J/ψ vector and axial-vector form factors; differential decay rates; branching fraction 0.0150(11)(10)(3); decay rate Γ = 1.73(12) × 10¹³ s⁻¹; V_cb determination
Outcomes reported
The study presents the first lattice QCD determination of vector and axial-vector form factors for B_c → J/ψ semileptonic decay across the full physical q² range. The calculation yields a total decay rate with 7% uncertainty and a branching fraction of 0.0150(11)(10)(3), enabling improved constraints on the CKM matrix element V_cb.
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