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Underlying events in Herwig++

arXiv:0809.2669
CERN-PH-TH-2008-195
KA-TP-22-2008
MCNET-08-11

by: Bahr, Manuel (Karlsruhe U., ITP) et al.

Abstract:
In this contribution we describe the new model of multiple partonic interactions (MPI) that has been implemented in Herwig++. Tuning its two free parameters is enough to find a good description of CDF underlying event data. We show extrapolations to the LHC and compare them to results from other models.

Herwig++ Status Report

arXiv:0809.2002
CP3-08-42
DCTP-08-134
IPPP-08-67
KA-TP-20-2008
MCNET-08-10

by: Bahr, M. (Karlsruhe U., ITP) et al.

Abstract:
Herwig++ is the successor of the event generator HERWIG. In its present version 2.2.1 it provides a program for full LHC event generation which is superior to the previous program in many respects. We briefly summarize its features and describe present work and some future plans.

PYTHIA 8 Status Report

arXiv:0809.0303
LU-TP-08-17
MCNET-08-09

by: Sjostrand, Torbjorn (Lund U.)

Abstract:
Pythia 8, the C++ rewrite of the commonly-used Pythia event generator, is now available in a first full-fledged version 8.1. The older Pythia 6.4 generator in Fortran 77 is still maintained, for now, but users are strongly recommended to try out and move to the new version as soon as feasible.

Comix, a new matrix element generator

arXiv:0808.3674
SLAC-PUB-13232
IPPP-08-31
DCPT-08-62
MCNET-08-08
JHEP 0812 (2008) 039

by: Gleisberg, Tanju (SLAC) et al.

Abstract:
We present a new tree-level matrix element generator, based on the recently introduced colour dressed Berends-Giele recursive relations. We discuss two new algorithms for phase space integration, dedicated to be used with large multiplicities and colour sampling.

Multiple Interactions in Herwig++

arXiv:0806.4250
MCNET-08-04

by: Bahr, Manuel (Karlsruhe U., ITP) et al.

Abstract:
In this contribution we describe a new model of multiple partonic interactions that has been implemented in Herwig++. Tuning its two free parameters we find a good description of CDF underlying event data. We show extrapolations to the LHC and discuss intrinsic PDF uncertainties.

Photon plus jet cross sections at the Tevatron

arXiv:0804.0490
FERMILAB-CONF-08-075

by: Sonnenschein, Lars (CERN)

Abstract:
Photon plus jet production has been studied by the D0 and CDF experiments in Run II of the Fermilab Tevatron Collider at a center of mass energy of sqrt{s}=1.96 TeV. Measurements of the inclusive photon plus jet, di-photon and photon plus b jet cross section are presented. They are based on integrated luminosities between 0.2 fb^-1 and 1.1 fb^-1. The results are compared to perturbative QCD calculations in various approximations.

Simulation of multiple partonic interactions in Herwig++

arXiv:0803.3633
CERN-PH-TH-2008-055
KA-TP-08-2008
JHEP 0807 (2008) 076

by: Bahr, Manuel (Karlsruhe U., ITP) et al.

Abstract:
In this paper we describe a new model of multiple partonic interactions that has been implemented in Herwig++. Tuning its two free parameters we find a good description of CDF underlying event data. We show extrapolations to the LHC.