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Particles and Fields

Eur. Phys. J. C 18, 711-718
DOI: 10.1007/s100520100572

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

J. Nemchik

Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353 Kosice, Slovakia

(Received: 5 September 2000 / Revised version: 24 November 2000 / Published online: 23 January 2001 -© Springer-Verlag 2001)

Within the color dipole gBFKL phenomenology of the diffraction slope we predict an anomalous t-dependence of the differential cross section $\mathrm {d}\sigma/\mathrm {d}t$ as a function of energy and Q2 for the production of radially excited V'(2S) light vector mesons. The pattern we found for the t-dependence for $\mathrm {d}\sigma/\mathrm {d}t$ is in contradiction with the well-known standard monotonical t-behavior for the V(1S) vector mesons. The origin of this phenomenon lies in the interplay of the nodal structure of the V'(2S) radial wave function and the energy and dipole size dependence of the color dipole cross section and the diffraction slope. We show how a different position of the node in the V'(2S) wave function leads to a different pattern of anomalous t-behavior of $\mathrm {d}\sigma/\mathrm {d}t$ and discuss the possibility to determine this position from the low energy and HERA data.

© Società Italiana di Fisica, Springer-Verlag 2001