424 research outputs found
Can a Highly Virtual Nucleon Experience Final State Interactions in Electron-Nucleus Scattering?
We discuss how the virtuality of the struck particle may affect the final
state interactions in electron-nucleus scattering. The extent to which short
range correlations inhibit rescattering taking place within the range of the
repulsive core of the NN interaction is quantitatively analyzed. The possible
modifications of the nucleon-nucleon scattering amplitude associated with the
virtuality is also studied, within the framework of a nonrelativistic model.
The results suggest that the on shell approximation can be safely employed in
the kinematical region relevant to the analysis of the available inclusive data
at large momentum transfer and low energy loss.Comment: 11 pages, 3 figures available upon request, Revte
Extraction of the Ratio of the Neutron to Proton Structure Functions from Deep Inelastic Scattering
We study the nuclear () dependence of the European Muon Collaboration
(EMC) effect at high values of (). Our approach makes use of
conventional nuclear degrees of freedom within the Relativistic Impulse
Approximation. By performing a non-relativistic series expansion we demonstrate
that relativistic corrections make a substantial contribution to the effect at
and show that the ratio of neutron to proton structure
functions extracted from a global fit to all nuclei is not inconsistent with
values obtained from the deuteron.Comment: 12 pages, 2 figures available upon request, Revte
The Strong Coupling Constant from Hadron Structure Phenomenology
We present recent developments on the role of the running coupling constant
at the intersection of perturbative and nonperturbative QCD. A number of
experiments show a smooth transition from small to large scales given by the
four-momentum transfer in the reactions. This is at variance with perturbative
QCD where the running coupling constant becomes infinite when the scale equals
. Approaches using an effective coupling constant could
help interpret the opposite trend of data as compared to standard perturbative
QCD predictions. We give an overview of the role of the coupling constant in
the procedure to match nonperturbative hadronic model to perturbative QCD and
we propose an extraction of an effective coupling constant from inclusive
electron proton scattering data at large Bjorken x.Comment: To appear in the proceedings of the QCD Evolution Workshop, JLab, May
14-17, 2012. Includes ws-ijmpcs.cl
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