The coupling constant g(ND Lambda c) from QCD sum rules

The ND Lambda(c) coupling constant is evaluated in a full QCD sum rule calc ulation. We study the Borel sum rule for the three point function of one ps eudoscalar one nucleon and one Lambda(c) current up to order seven in the o perator product expansion. The Borel transform is performed with respect to the nucleon and Lambda(c) momenta, which are taken to be equal, whereas th e momentum q(2) of the pseudoscalar vertex is taken to be zero. This coupli ng constant is relevant in the meson cloud description of the nucleon which has been recently used to explain exotic events observed by the H1 and ZEU S Collaborations at HERA.