Abstract
We present new inelastic neutron scattering data which show that a second magnetic branch (optic branch) exists in CuGeO3 and gives a non-negligible spectral weight to the scattering. From the dependencies on the scattering vector and the magnetic field of the inelastic neutron intensity at scattering vectors (0, Qk, Ql + ½), we are led to the conclusion that both this new branch and the previously reported have anomalous structure factors and polarisations.