Nagy-Soper subtraction: a review

Understand

In this document, we present a review on an alternative NLO subtraction scheme, based on the splitting kernels of an improved parton shower that promises to facilitate the inclusion of higher order corrections into Monte Carlo event generators.

• We give expressions for the scheme for massless emitters, and point to work on the extension for massive cases.
• As an example, we show results for the C parameter of the process e+ e- -> 3 jets at NLO which have recently been published as a verification of this scheme.
• We equally provide analytic expressions for integrated counterterms that have not been presented in previous work, and comment on the possibility of analytic approximations for the remaining numerical integrals