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15 papers · 2 filters
Merging Multi-leg NLO Matrix Elements with Parton Showers
Leif Lonnblad, Stefan Prestel
We discuss extensions the CKKW-L and UMEPS tree-level matrix element and parton shower merging approaches to next-to-leading order accuracy. The generalisation of CKKW-L is based o…
Unitarising Matrix Element + Parton Shower merging
Leif Lonnblad, Stefan Prestel
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…
Fooling Around with the Sudakov Veto Algorithm
Leif Lonnblad
The Sudakov veto algorithm for generating emission and no-emission probabilities in parton showers is revisited and some reweighting techniques are suggested to improve statistics…
Exclusive final states in diffractive excitation
Christoffer Flensburg, Gosta Gustafson, Leif Lonnblad
In this paper we describe a formalism for generating exclusive final states in diffractive excitation, based on the optical analogy where diffraction is fully determined by the abs…
New picture of jet quenching dictated by color coherence
Jorge Casalderrey-Solana, Yacine Mehtar-Tani, Carlos A. Salgado +1
We propose a new description of the jet quenching phenomenon observed in nuclear collisions at high energies in which coherent parton branching plays a central role. This picture i…
ColorMath - A package for color summed calculations in SU(Nc)
Malin Sjödahl
A Mathematica package for color summed calculations in QCD (SU(Nc)) is presented. Color contractions of any color amplitude appearing in QCD may be performed, and the package uses…