Unitarising Matrix Element + Parton Shower merging
Leif Lonnblad, Stefan Prestel
TL;DR
This paper improves the CKKW-L merging method for combining matrix elements with parton showers by introducing an add/subtract scheme that reduces merging scale dependence and maintains unitarity, ensuring accurate inclusive cross sections.
Contribution
It proposes a novel add/subtract scheme for the CKKW-L method that minimizes merging scale dependence and preserves the unitarity of the parton shower.
Findings
Reduced dependence on the merging scale.
Preservation of inclusive cross sections for each jet multiplicity.
Enhanced consistency of the merging scheme.
Abstract
We revisit the CKKW-L method for merging tree-level matrix elements with parton showers, and amend it with an add/subtract scheme to minimise dependencies on the merging scale. The scheme is constructed to, as far as possible, recover the unitary nature of the underlying parton shower, so that the inclusive cross section is retained for each jet multiplicity separately.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.