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Manuscript Title: AROMA 2.2 - a Monte Carlo generator for heavy flavour events in ep collisions.
Authors: G. Ingelman, J. Rathsman, G.A. Schuler
Program title: AROMA version 2.2
Catalogue identifier: ADEY_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 101(1997)135
Programming language: Fortran.
Computer: DEC AlphaStation 200.
Operating system: OSF1, ULTRIX, VMS.
Keywords: Particle physics, Elementary, Electron-proton, Collisions, Boson-gluon fusion, Event simulation, First order matrix, Element, Heavy quark production, Charm quarks, Bottom quarks.
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 quarks can be produced in high energy electron-proton collisions through the boson-gluon fusion process.

Solution method:
The process is factorized into parts which can be treated separately and simulated with Monte Carlo methods. The full electroweak structure of the electron-gluon interaction is taken into account in the leading order matrix element with explicit heavy quark masses. Higher order QCD radiation is treated using initial and final state leading logQ**2 parton showers and hadronization is performed using the Lund string model, resulting in complete events including the interaction dynamics and observable final state particles.

Unusual features:
The following libraries are required: CERNLIB packlib, mathlib (including DIVONNE) and kernlib.

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