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Scattering Massive String Resonances through Field-Theory Methods
Max Guillen1, Henrik Johansson1,2, Renann Lipinski Jusinskas3
1Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden.
Abstract:
We present a new method, exact in α^{'}, to explicitly compute string tree-level amplitudes involving one massive state and any number of massless ones. This construction relies on the so-called twisted heterotic string, which admits only gauge multiplets, a gravitational multiplet, and a single massive supermultiplet in its spectrum. In this simplified model, we determine the moduli-space integrand of all amplitudes with one massive state using Berends-Giele currents of the gauge multiplet. These integrands are then straightforwardly mapped to gravitational amplitudes in the twisted heterotic string and to the corresponding massive amplitudes of the conventional type-I and type-II superstrings.
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