Matching Parton Showers and Matrix Elements

Matching parton showers to NLO computations

We give a prescription for attaching parton showers to next-to-leading order (NLO) partonic jet cross sections in electron-positron annihilation. Our method effectively extends to NLO the scheme of Catani, Krauss, Kuhn, and Webber for matching between m hard jets and (m+1) hard jets. The matching between parton splitting as part of a shower and parton splitting as part of NLO matrix elements is...

Matching between matrix elements and parton showers using a Leading-Log subtraction method in NLO-QCD

A new method to construct event-generators based on next-to-leading order QCDmatrixelements and leading-logarithmic parton showers is proposed. Matrix elements of loop diagrams as well as those of a tree level can be generated using an automatic system. A soft/collinear singularity is treated using a leading-log subtraction method. Higher order re-summation of the soft/collinear correction by t...

Matching xed order Matrix Elements to Parton Showers for heavy quark production in e

Combining QCD Matrix Elements at Next-to-Leading Order with Parton Showers

We present a general method to combine next-to-leading order (NLO) matrix elements in QCD with leading logarithmic parton showers by applying a suitably modified version of the phase-space-slicing method. The method consists of subsuming the NLO corrections into a scale-dependent phase-space-slicing parameter, which is then automatically adjusted to cut out the leading order, virtual, soft and ...

0 v 1 1 8 A ug 1 99 7 LU TP 97 – 18 August 1997 A matching of matrix elements and parton showers

We propose a simple scheme to start a parton-shower evolution description from a given jet configuration in ee annihilation events. This allows a convenient combination of the full angular information content of matrix elements with the detailed sub-jet structure of parton showers, and should give a realistic overall description of event properties. Explicit studies with this hybrid approach ar...