Absorption and recoil of fundamental strings by D-strings Original Research Article

The inclusive absorption cross section of a fundamental IIB string to a D-string is calculated perturbatively. The leading-order result agrees with the estimate based on the stringy Higgs mechanism via the Cremmer-Scherk coupling. It is argued that the subleading-order correction is dominated by purely planar diagrams in the large mass limit. The correction represents the conversion of the binding energy into the local recoil process of the fundamental string and the D-string bound state. We show their presence explicitly in the next leading order.