Abstract
Next-to-leading corrections in large M c expansion are calculated to the form factors of semileptonic decays of nonstange and strange charmed pseudoscalar mesons: D → K( K ∗)ℓ +ν ℓ and D s + → Φℓ + ν ℓ. Calculations are performed within Heavy quark effective thoery (HQET) supplemented by Chiral perturbation theory at the quark level (CHPT) q based on the extended Nambu-Jona-Lasinio model with linear realization of chiral U(3) × U(3) symmetry. The 1 M c corrections are found commensurable in order of magnitude with first order corrections in current s-quark mass expansion. The results are compared with the experimental average data within the accuracy better than 28%.
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