TY - JOUR
T1 - Coherent contributions of nuclear mesons to electroproduction and the HERMES effect
AU - Miller, Gerald A.
AU - Brodsky, Stanley J.
AU - Karliner, Marek
N1 - Funding Information:
This work was supported in part by the United States Department of Energy under contract numbers DE–AC03–76SF00515, and DE-FG03-97ER4104 and by a grant from the US-Israel Binational Science Foundation. We appreciate the hospitality of the CSSM in Adelaide where some of this work was performed. We thank W. Melnitchouk, S. Rock, M. Strikman, and especially G. van der Steenhoven, for useful discussions.
PY - 2000/5/25
Y1 - 2000/5/25
N2 - We show that nuclear σ,ω, and π mesons can contribute coherently to enhance the electroproduction cross section on nuclei for longitudinal virtual photons at low Q2 while depleting the cross section for transverse photons. We are able to describe recent HERMES inelastic lepton-nucleus scattering data at low Q2 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. (C) 2000 Published by Elsevier Science B.V.
AB - We show that nuclear σ,ω, and π mesons can contribute coherently to enhance the electroproduction cross section on nuclei for longitudinal virtual photons at low Q2 while depleting the cross section for transverse photons. We are able to describe recent HERMES inelastic lepton-nucleus scattering data at low Q2 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. (C) 2000 Published by Elsevier Science B.V.
UR - http://www.scopus.com/inward/record.url?scp=0034713142&partnerID=8YFLogxK
U2 - 10.1016/S0370-2693(00)00433-0
DO - 10.1016/S0370-2693(00)00433-0
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AN - SCOPUS:0034713142
SN - 0370-2693
VL - 481
SP - 245
EP - 252
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 2-4
ER -