Following our previous paper (hep-th/9909027), we generalize a supersymmetric<br />
boundary state so that arbitrary configuration of the gauge field coupled to<br />
the boundary of the worldsheet is incorpolated. This generalized boundary state<br />
is BRST invariant and satisfy the non-linear boundary conditions with<br />
non-constant gauge field strength. This boundary state contains divergence<br />
which is identical with the loop divergence in a superstring sigma model. Hence<br />
vanishing of the beta function in the superstring sigma model corresponds to a<br />
well-defined boundary state with no divergence. The coupli...