Charm semileptonic decays from E791 Available to Purchase

We report the results of a measurement of the form factor ratios $rV=V(0)/A1(0),$ $r2=A2(0)/A1(0)$ and $r3=A3(0)/A1(0)$ in the decays $D+→K̄*0l+νl,$ with $K̄*0→K−π+,$ and $Ds+→φl+νl,$ with $φ→K−K+,$ using data from charm hadroproduction experiment E791 at Fermilab. We also report the results of an E791 measurement of the branching fraction $B(D+→ρ0l+νl)/B(D+→K̄*0l+νl).$