2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39685Exclusive semileptonic B decays to orbitally and radially excited charmed mesons are investigated in the first order of the heavy quark expansion. The emerging leading and subleading Isgur-Wise functions are calculated in the framework of the relativistic quark model. It is found that both relativistic and the 1/m_Q corrections play an important role and substantially modify results. An interesting interplay between different corrections is observed.10 pages, JHEP class, Talk given at the Vth International Workshop "Heavy Quark Physics", Dubna, Russia, 6-8 April 2000High Energy Physics - Phenomenologytext