Henrik Johansson, Agustin Sabio Vera, Eduardo Serna Campillo, Miguel A. Vazquez-Mozo
In this note we study the applicability of the color-kinematics duality to the scattering of two distinguishable scalar matter particles with gluon emission in QCD, or graviton emission in Einstein gravity. Previous analysis suggested that direct use of the Bern-Carrasco-Johansson double-copy prescription to matter amplitudes do not reproduce the gravitational amplitude in multi-Regge kinematics. However, minimal extensions of the calculation cure this obstacle. Here we present two approaches: introduction of a scalar contact interaction, or relaxing distinguishability of the scalars. In both cases new diagrams allow for a full reconstruction of the correct Regge limit on the gravitational side. Both modifications correspond to theories obtained by dimensional reduction from higher-dimensional gauge theories.
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http://arxiv.org/abs/1307.3106
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