Verlag des Forschungszentrums Jülich
JUEL-3999
Ivanov, Igor
Diffractive production of vector mesons in Deep Inelastic Scattering within kt-factorization approach
172 S., 2003
In this work we give a theoretical description of the elastic vector meson production in
diffractive DIS developed within the kt-factorization formalism. Since the kt-factorization scheme
does not require large values of Q2 + m2⁄V, we conduct an analysis that is applicable to all values
of Q2 from photo- up to highly virtual production of vector mesons. The basic quantity in
this approach -the unintegrated gluon structure function -was for the first time extracted
from the experimental data on F2p, thoroughly investigated, and consistently used in the
vector meson production calculation. Moreover, by limiting ourselves to the lowest Fock state
of the vector meson, we were able to construct in a closed form the theory of spin-angular
coupling in the vector meson. This allowed us for the first time to address the production of a
vector meson in a given spin-angular state. We performed an extensive analytical and
numerical investigation of the properties of lS, 2S, and D-wave vector meson production reactions.
Treating the physical ground state \rector mesons as purely lS states, we observed a good
overall agreement with all available experimental data on vector meson production. For the
excited states, our analysis predicts a picture which is remarkably different from lS-state, so
that such reactions can be regarded as potential sources of new information on the structure
of excited states in vector mesons.
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