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Manuscript Title: PROJET: jet cross sections in deeply inelastic electron proton scattering version 4.1.
Authors: D. Graudenz
Program title: PROJET VERSION 4.1
Catalogue identifier: ADCF_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 92(1995)65
Programming language: Fortran.
RAM: 2.5M words
Keywords: Particle physics, Elementary, Phenomenological model, Chromodynamics quantum, Jet physics, Deeply inelastic Electron proton Scattering, Monte carlo simulation.
Classification: 11.6.

Subprograms used:
Cat Id Title Reference
ACLI_v1_0 PDFLIB, VERSION 3.10 CPC 75(1993)396

Nature of problem:
In deeply inelastic scattering, the hadronic final state can be analysed by a jet cluster algorithm resulting in cross sections for the production of (n+1) jets (including the target remnant jet). It is possible to extract physical parameters (AlphaQCD, parton densities fi(xi,mu2f)) from experimentally measured jet cross sections.

Solution method:
PROJET makes it possible to study these cross sections from a theoretical point of view by performing the integration of the differential cross sections over phase space regions that are related to a certain number of jets. QCD corrections are included by analytical formulae.

Restrictions:
The program contains jet cross sections for the production of (1+1), (2+1) and (3+1) jets. QCD corrections to (1+1) and (2+1) jet cross sections are included for all polarisations of the exchanged virtual photon.

Running time:
Depends strongly on the process under consideration; the generation of the weight for 1 event takes typically 0.001 to 0.02 seconds on a DEC or hp workstation, depending on the process; therefore an integration using 200,000 events typically needs 3 minutes to 1 hour of CPU time.