Elsevier Science Home
Computer Physics Communications Program Library
Full text online from Science Direct
Programs in Physics & Physical Chemistry
CPC Home

[Licence| Download | New Version Template] aess_v1_0.tar.gz(2848 Kbytes)
Manuscript Title: MCgrid: projecting cross section calculations on grids
Authors: Luigi Del Debbio, Nathan Hartland, Steffen Schumann.
Program title: MCgrid
Catalogue identifier: AESS_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 185(2014)2115
Programming language: C++, shell, Python.
Computer: PC running Linux, Mac.
Operating system: Linux, Mac OS.
RAM: Varying
Keywords: QCD NLO calculations, event generator, PDFs.
Classification: 11.2, 11.5, 11.9.

External routines: HepMC (http://lcgapp.cern.ch/project/simu/HepMC/), Rivet (https://rivet.hepforge.org/), APPLgrid (http://applgrid.hepforge.org/).
A Sherpa (https://sherpa.hepforge.org/trac/wiki) installation is also required.

Nature of problem:
Efficient filling of cross section grid files from fully exclusive parton level Monte Carlo events.

Solution method:
Analyse Monte Carlo events via the Rivet program, which projects events on discretized cross section tables from APPLgrid.

Running time:
Approximately 6 minutes per 1 million Drell-Yan events from Sherpa. This includes both the event generation and the mcgrid computations. The times can vary quite dramatically. The process used in the test case (which is a relatively fast one) takes about 2 minutes 30 seconds for the initial (phase-space fill) run and about 3 minutes for the second and final run. This is for 1 million events on a 2.9GhZ ivy bridge i7.