European Physical Journal C: Particles and Fields (Aug 2018)

The double-soft integral for an arbitrary angle between hard radiators

  • Fabrizio Caola,
  • Maximilian Delto,
  • Hjalte Frellesvig,
  • Kirill Melnikov

DOI
https://doi.org/10.1140/epjc/s10052-018-6180-7
Journal volume & issue
Vol. 78, no. 8
pp. 1 – 11

Abstract

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Abstract We consider the double-soft limit of a generic QCD process involving massless partons and integrate analytically the double-soft eikonal functions over the phase-space of soft partons (gluons or quarks) allowing for an arbitrary relative angle between the three-momenta of two hard massless radiators. This result provides one of the missing ingredients for a fully analytic formulation of the nested soft-collinear subtraction scheme described in Caola et al. (Eur Phys J C 77(4):248, 2017).