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Manuscript Title: MAJOR 1.5 - a Monte Carlo generator for heavy Majorana neutrinos in ep collisions.
Authors: J. Rathsman, G. Ingelman
Program title: MAJOR version 1.5
Catalogue identifier: ADEQ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 101(1997)143
Programming language: Fortran.
Computer: DEC AlphaStation.
Operating system: OSF1, ULTRIX, VMS.
Keywords: Particle physics, Elementary, Event simulation, Heavy majorana neutrinos, Mass mixing, Right-handed w-bosons, Deep inelastic electron Proton scattering.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
ACTU_v1_0 PYTHIA 5.7 AND JETSET 7.4 CPC 82(1994)74
ADFE_v1_0 LEPTO version 6.5 CPC 101(1997)108

Nature of problem:
Heavy Majorana neutrinos are predicted by extended versions of the standard model of electroweak interactions in particle physics. They can be produced in deep inelastic electron-proton scattering via lepton mixing or exchange of 'light' right-handed W-bosons (e+-p -> NX) and they decay into a lepton and a weak boson (N -> e+-W-+ or nu Z0).

Solution method:
The process is factorized into parts which can be treated separately and simulated with Monte Carlo methods. The basic electroweak process is given by leading order matrix elements calculated using the narrow-width approximation for the Majorana neutrino propagator. QCD radiation is treated using initial and final state leading logQ**2 parton showers. Hadronization is performed using the Lund string model, resulting in a complete final state of observable particles. CERNLIB packlib, mathlib and kernlib are used. LEPTO 6.5 is required.

Restrictions:
The right-handed W must have lower mass than the Majorana neutrino.

Running time:
5-50 events per second on a DEC AlphaStation 200 depending on process simulated and completeness of simulation.