  Feynman amplitudes of light-cone gauge superstring field theory are
ill-defined because of various divergences. In a previous paper, one of the
authors showed that taking the worldsheet theory to be the one in a linear
dilaton background $\Phi=-iQX^{1}$ with Feynman $i\varepsilon$
$(\varepsilon>0)$ and $Q^{2}>10$ yields finite amplitudes. In this paper, we
apply this worldsheet theory to dimensional regularization of the light-cone
gauge NSR superstring field theory. We concentrate on the amplitudes for even
spin structure with external lines in the (NS,NS) sector. We show that the
multiloop amplitudes are indeed regularized in our scheme and that they
coincide with the results in the first-quantized formalism through the analytic
continuation $Q\to0$.
