2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149097The form factors of the flavor changing vector current between a $\bar q Q$-meson and the lightest $\bar q q$ (pseudoscalar-)meson are computed exactly and explicitly in the 't~Hooft model (planar QCD in $1+1$ dimensions) in the limit that the mass of $q$-quark vanishes.8p (uuencoded, includes 4 eps figs, LaTeX & epsf), SMU-HEP/94-11 and UCSD/PTH 94-09High Energy Physics - TheoryHigh Energy Physics - Phenomenologytext