Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-03
Fizika B8:345-352,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 4 figures, latex (uses psfig.tex), Talk presented at "Nuclear and Particle Physics with CEBAF at Jefferson Lab", Dubr
Scientific paper
We review the perturbative QCD formalism of hadronic electromagnetic form factors and the color transparency ratio for quasi-exclusive electroproduction of the proton and pion from nuclear targets. We have completed the first full calculations including all leading order quark subprocesses and integrations over distribution amplitudes, including Sudakov effects. For the case of the proton, the calculated result shows scaling beyond $Q^2=10$ GeV$^2$. The calculation incorporating filtering due to the nuclear medium is cleaner than the corresponding calculation in free space because of attenuation of large distance amplitudes. We find that the color transparency ratio is rather insensitive to theoretical uncertainties inherent in the perturbative formalism, such as the choice of the hadron distribution amplitude.
Jain Pankaj
Kundu Bijoy
Ralston John P.
Samuelsson Jim
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