Merging of 4 or 5 elements with n elements

Multi-jet merging with NLO matrix elements

In the algorithm presented here, the ME+PS approach [1] to merge samples of tree-level matrix elements into inclusive event samples is combined with the POWHEG method [2], which includes exact next-to-leading order matrix elements in the parton shower. The advantages of the method are discussed and the quality of its implementation in SHERPA is exemplified by results for e+e− annihilation into ...

Merging Computational Elements in Vortex Simulations

This paper analyzes the process of merging groups of many Gaussian basis functions into a single basis function in vortex simulations. Analysis of the equations governing this process yields fundamental parameters and uniform estimates of the merger-induced error. In a merging event, the uniform error bound depends only on relationships between nearby computational elements permitting fast and ...

Merging Parton Showers and Matrix Elements

This thesis considers models for describing high energy particle collisions. Existing phenomonological models are modified and new implementations made in order to achive a better description of states with several hard jets. To predict final state hadrons, parton showers are used together with pheonomenological hadronization models. These models describe a wide range of observables, but have t...

Real Time Study of a k-out-of-n System: n Identical Elements with Increasing Failure Rates

Extending CKKW-merging to One-Loop Matrix Elements

We extend earlier schemes for merging tree-level matrix elements with parton showers to include also merging with one-loop matrix elements. In this paper we make a first study on how to include one-loop corrections, not only for events with a given jet multiplicity, but simultaneously for several different jet multiplicities. Results are presented for the simplest non-trivial case of hadronic e...