Malgorzata Worek

Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions

We compare different procedures for combining fixed-order tree-level matrix-element generators with parton showers. We use the case of W-production at the Tevatron and the LHC to compare different implementations of the so-called CKKW and MLM schemes using different matrix-element generators and different parton cascades. We find that although similar results are obtained in all cases, there are important differences.

VBFNLO: A Parton level Monte Carlo for processes with electroweak bosons

VBFNLO is a flexible parton level Monte Carlo program for the simulation of vector boson fusion (VBF), QCD induced single and double vector boson production plus two jets, and double and triple vector boson production (plus jet) in hadronic collisions at next-to-leading order (NLO) in the strong coupling constant, as well as Higgs boson plus two jet production via gluon fusion at the one-loop level. For the new version -- Version 2.7.0 -- several major enhancements have been included into VBFNLO. The following new production processes have been added:

Helac-Phegas: A generator for all parton level processes

W\gamma jj

Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order

in VBF,

Hadronic top-quark pair production in association with two jets at Next-to-Leading Order QCD

HHjj

Multi-parton cross sections at hadron colliders

in VBF,

Measuring the Higgs boson parity at a Linear Collider using \(\tau\) impact parameter and \(\tau \to \rho \nu\) decay

W

Observing strongly interacting vector boson systems at the CERN Large Hadron Collider

,

NLO QCD calculations with HELAC-NLO

Wj

HELAC - A MONTE CARLO GENERATOR FOR MULTI-JET PROCESSES

,