文摘
The influence of cold nuclear matter on lepto-production of hadrons in semi-inclusive deep inelastic scattering is measured using the CLAS detector in Hall B at Jefferson Lab and a 5.014 GeV electron beam. We report the multiplicity ratios for targets of C, Fe, and Pb relative to deuterium as a function of the fractional virtual photon energy z transferred to the and the transverse momentum squared of the . We find that the multiplicity ratios for are reduced in the nuclear medium at high z and low , with a trend for the transverse momentum to be broadened in the nucleus for large .