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Resolve "CSS subtraction scheme for massive partons"

Stefan Hoeche requested to merge 527-css-subtraction-scheme-for-massive-partons into rel-2-3-0

Description

NLO subtraction scheme 2, introduced to improve the resummation in the CSS, was not implemented for massive partons. This MR solves the problem by adding the massive counterterms to the Massive_Kernels and allows the corresponding subtraction terms in Amegic and Comix.

Test Plan

Test the NLO cross section with a simple pp->tt runcard, using NLO_SUBTRACTION_SCHEME=0 and NLO_SUBTRACTION_SCHEME=2. The cross sections should agree within statistical uncertainties.

Additional Checklist Items

  • I have updated documentation as needed
  • I considered if this should be cherry-picked/ported somewhere else (rel-2-x or master), and if yes, opened a corresponding issue or MR

Closes #527 (closed)

Edited by Stefan Hoeche

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