Bruzzo, UgoRicco, Antonio20052011-09-0720052011-09-072005Lett. Math. Phys. 76 (2006) 57-63https://openscience.sissa.it/handle/1963/1785We prove a conjecture by F. Ferrari. Let X be the total space of a nonlinear deformation of a rank 2 holomorphic vector bundle on a smooth rational curve, such that X has trivial canonical bundle and has sections. Then the normal bundle to such sections is computed in terms of the rank of the Hessian of a suitably defined superpotential at its critical points.106989 bytesapplication/pdfen-USPreprint