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Two important sources of systematic errors in lattice QCD calculations ofradiative leptonic decays are unwanted exponentials in the sum overintermediate states and unwanted excited states created by the mesoninterpolating field. Performing the calculation using a 3d sequentialpropagator allows for better control over the systematic uncertainties fromintermediate states, while using a 4d sequential propagator allows for bettercontrol over the systematic uncertainties from excited states. We calculateform factors using both methods and compare how reliably each controls thesesystematic errors. We also employ a hybrid approach involving global fits todata from both methods.

Controlling unwanted exponentials in lattice calculations of radiative leptonic decays