The field theory limit of multiloop string amplitudes

We report on recent progress in the use of string techniques for the computation of field theory amplitudes. We show how one–loop renormalization constants in Yang–Mills theory can be computed using the open spinning string, we review the calculation of two–loop scalar amplitudes with the bosonic string, and we briefly indicate how the technique can be applied to the two–loop vacuum bubbles of Yang–Mills theory. e-mail: [email protected] On leave from Università di Torino, Italy