  Murata and Schnabl recently proposed solutions for the multiple-brane
backgrounds in Witten's open bosonic string field theory. The solutions contain
some singularities, and in one particular regularization, the double-brane
solution reproduces the desired energy and the Ellwood invariant, which is
conjectured to represent coupling to a closed string. However, it turned out
that the equation of motion is slightly violated. In this paper, we propose
another regularization method for the double-brane solution. The regularized
solution is realized as a superposition of the wedge states with operator
insertions. It respects the equation of motion both contracted with the
solution itself and with the states in the Fock space. It reproduces the
desired double-brane tension, while the expected Ellwood invariant is not
obtained.
