Abstract

Semi-inclusive electroproduction of all three pion flavors (pi^+, pi^-, pi^0) from both deuteron and proton targets is measured for Q^2 > 1.1 GeV^2, 0.12 1.4 GeV. We study the P_T, Z, and phi_h dependences for the ratio of yields d(e,e',pi)X/p(e,e'pi)X. From these ratios it is possible to study the d/u valence quark distributions for the neutron and proton as well as the ratio of (current) fragmentation functions D^-/D^+. The data presented is from Jefferson Lab experiment PR94-102, using an electron beam with energy 5.769 GeV with beam current of 7nA. The results agree with previous data as well as provide an extended kinematic coverage.

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