Charged-pion multiplicity ratio and EMC effect in e-A DIS with CLAS

We present a measurement of charged-pion production in DIS off 2H, C, Fe, and Pb using the CLAS detector and the CEBAF 5 GeV electron beam. We report a triple-differential measurement of the multiplicity ratio for pi+ and pi- as a function of virtual-photon energy and virtuality, and pion momentum fraction or transverse momentum. The results are compared with the GiBUU transport model, nuclear fragmentation functions, as well as with a model based on pre-hadron absorption. Also, we report results for the EMC ratio that extends previous measurements to lower Q2 and compare with expectations from nuclear PDFs. These precise results could help constrain the flavor dependence of nuclear effects and probe an unexplored kinematic region where the hadronization timescales are expected to be of the same order as the nuclear lengths.