Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-14
Phys.Lett.B481:245-252,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
Published version with improved shadowing parametrization. To be published in Physics Letters B 481, 245-252, May, 2000
Scientific paper
10.1016/S0370-2693(00)00433-0
We show that nuclear sigma, omega, and pi mesons can contribute coherently to enhance the electroproduction cross section on nuclei for longitudinal virtual photons at low Q^2 while depleting the cross section for transverse photons. We are able to describe recent HERMES inelastic lepton-nucleus scattering data at low Q^2 and small x using photon-meson and meson-nucleus couplings which are consistent with (but not determined by) existing constraints from meson decay widths, nuclear structure, deep inelastic scattering, and lepton pair production data. We find that while nuclear-coherent pion currents are not important for the present data, they could be observed at different kinematics. Our model for coherent meson electroproduction requires the assumption of mesonic currents and couplings which can be verified in separate experiments. The observation of nuclear-coherent mesons in the final state would verify our theory and allow the identification of a specific dynamical mechanism for higher-twist processes.
Brodsky Stanley J.
Karliner Marek
Miller Gary A.
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