We obtain the asymmetry parameter as a function of lepton energy for the scattering of polarized muons from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ in the inelastic process l${+}^{12}$C${\to }^{12}$${\mathrm{C}}^{\mathrm{*}}$+l’. Only the case for highly relativistic leptons is considered but ${\mathit{q}}^2$ is allowed to become small. It is found that the asymmetry parameter increases rapidly with decreasing ${\mathit{q}}^2$ at very small angles. The cases of the tau lepton as well as that of the low-energy electron are also considered.

• Received 6 July 1992

DOI:https://doi.org/10.1103/PhysRevC.47.873