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Manuscript Title: LEPTO 6.5 - a Monte Carlo generator for deep inelastic lepton-nucleon scattering.
Authors: G. Ingelman, A. Edin, J. Rathsman
Program title: LEPTO version 6.5
Catalogue identifier: ADFE_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 101(1997)108
Programming language: Fortran.
Computer: DEC AlphaStation 200.
Operating system: OSF1, ULTRIX, HP-UX, VMS.
Keywords: Particle physics, Elementary, Event simulation, Deep inelastic Scattering, Hadronic final state, Jets, Rapidity gaps.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
ACTU_v1_0 PYTHIA 5.7 AND JETSET 7.4 CPC 82(1994)74

Nature of problem:
To describe the complete interaction dynamics and the resulting final state in deep inelastic lepton-nucleon scattering. Simulated events facilitate studies of the hadronic final state with, e.g., jets and rapidity gaps.

Solution method:
The problem is naturally divided into several phases: the scattering of the lepton on the (anti)quark in the nucleon given by leading order electroweak matrix elements in the QCD-improved parton model, leading order QCD matrix elements, higher order QCD emissions approximated by leading logQ**2 initial and final state parton showers, non-perturbative QCD interactions described by a model for soft colour interactions and the Lund string hadronization model. All are treated with Monte Carlo simulation methods, resulting in a complete account for the interaction dynamics and the final state of observable particles.

Restrictions:
Polarized nucleons are not treated.

Unusual features:
The CERNLIB packlib, mathlib and kernlib libraries are needed.

Running time:
10-100 events per second on a DEC AlphaStation 200 depending on process simulated and completeness of simulation.