Analysis of the Semileptonic Decay $D^0 \to \overline{K}^0 \pi^- \mu^+ \nu$

Abstract

Using data collected by the fixed target Fermilab experiment FOCUS, we present several first measurements for the semileptonic decay [Formula: see text]. Using a model that includes a [Formula: see text] S -wave component, we measure the form factor ratios to be rv = 1.706 ± 0.677 ± 0.342 and r2 = 0.912 ± 0.370 ± 0.104 and the S -wave amplitude to be A = 0.347 ± 0.222 ± 0.053 GeV -1. Finally, we measure the vector semileptonic branching ratio [Formula: see text].