Dependence of exclusive vector meson production in muon-nucleus scattering.

摘要

Preliminary results on the cross section ratios of exclusive (rho)(sup 0) and (phi) meson production off carbon, calcium, and lead to that off deuterium in deep-inelastic muon-nucleon scattering are reported. The data were taken with the E665 spectrometer using the Fermilab Tevatron muon beam. The mean beam energy was 470 GeV. Significant increase in the cross section ratios is seen as the four-momentum squared of the virtual photon increases. The results support the idea of color transparency.