Journal of High Energy Physics

, 2018:38 | Cite as

Independently parameterised momenta variables and Monte Carlo IR subtraction

  • Peter Cox
  • Tom MeliaEmail author
Open Access
Regular Article - Theoretical Physics


We introduce a system of parameters for the Monte Carlo generation of Lorentz invariant phase space that is particularly well-suited to the treatment of the infrared divergences that occur in the most singular, Born-like configurations of 1 → n QCD processes. A key feature is that particle momenta are generated independently of one another, leading to a simple parameterisation of all such IR limits. We exemplify the use of these variables in conjunction with the projection to Born subtraction technique at next-to-next-to-leading order. The geometric origins of this parameterisation lie in a coordinate chart on a Grassmannian manifold.


NLO Computations QCD Phenomenology 


Open Access

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  1. 1.Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced StudyUniversity of TokyoKashiwaJapan

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