Anomalous t-dependence in diffractive electroproduction of 2S radially excited light vector mesons at HERA

Within the color dipole gBFKL dynamics applied to the diffraction slope, we predict an anomalous t dependence of the differential cross section as a function of energy and Q for production of radially excited V ′(2S) light vector mesons in contradiction with a well known standard monotonous tbehaviour for V (1S) mesons. The origin of this phenomenon is based on the interplay of the nodal structure of V ′(2S) radial wave function with the energy and dipole size dependence of the color dipole cross section and of the diffraction slope. We present how a different position of the node in V ′(2S) wave function leads to a different form of anomalous tbehaviour of the differential cross section and discuss a possibility how to determine this position from the low energy and HERA data.