Exclusive $\pi^{-}$ Electroproduction off the Neutron in Deuterium in the Resonance Region

The nucleon resonance ($N^{\ast}$) studies is crucial to our understanding of the structure and interaction of hadrons. Although the excited states of the proton have been studied in great detail, there are very few data available for the neutron excitations because of the inherent difficulty in obtaining a free neutron target. The deuterium target is the best alternate target for neutrons. The ``e1e" CLAS data that we analyze includes both a hydrogen and deuterium target run period, which allows a combined analysis of pion electroproduction off the free proton, bound proton, and bound neutron. Hence it will provide the experimentally best possible information about the off-shell and final state interaction effects in deuterium, which must be considered in order to extract the neutron information. The goal of our research is to provide the exclusive ${\gamma}^{\ast}(n) \rightarrow p^{+} {\pi}^{-}$ reaction cross section. The good agreement of the inclusive cross section off deuterium with the world data not only verified that the electron identification and fiducial cut are proper, but also confirmed that the normalization used in the exclusive channel is right. In this talk, I will present a current data analysis status, and potentially preliminary cross-section results.