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. NemchikInstitute 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)
Abstract
Within the color dipole gBFKL phenomenology
of the diffraction slope
we predict an
anomalous t-dependence of the
differential cross section
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
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
and
discuss the possibility to determine this
position from the low energy and HERA data.
© Società Italiana di Fisica, Springer-Verlag 2001
