Abstract
We examine the Regge (high energy) limit of 4-point scattering in both QCD and gravity, using recently developed techniques to systematically compute all corrections up to next-to-leading power in the exchanged momentum i.e. beyond the eikonal approximation. We consider the situation of two scalar particles of arbitrary mass, thus generalising previous calculations in the literature. In QCD, our calculation describes power-suppressed corrections to the Reggeisation of the gluon. In gravity, we confirm a previous conjecture that next-to-soft corrections correspond to two independent deflection angles for the incoming particles. Our calculations in QCD and gravity are consistent with the well-known double copy relating amplitudes in the two theories.
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Luna, A., Melville, S., Naculich, S.G. et al. Next-to-soft corrections to high energy scattering in QCD and gravity. J. High Energ. Phys. 2017, 52 (2017). https://doi.org/10.1007/JHEP01(2017)052
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DOI: https://doi.org/10.1007/JHEP01(2017)052