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Manuscript Title: A Monte Carlo event generator for high energy hadron-hadron collisions: ECCO 2.0.
Authors: J. Pan
Program title: ECCO 2.0
Catalogue identifier: ACPM_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 78(1993)190
Programming language: Fortran.
Computer: VAX CLUSTER.
Operating system: VMS, UNIX.
RAM: 100K words
Word size: 32
Keywords: Particle physics, Elementary, Event simulation, Monte carlo event Generator, Geometrical model, Eikonal formalism, Cut pomerons, Clusters, Self-similar branching, Hadronization, Hadronic final states.
Classification: 11.2.

Nature of problem:
A hadron is a complicated, extended object. The majority of high energy hadron-hadron collision events contains a large number of final state hadrons. Because of the low transverse momenta of the produced hadrons, such process can not be understood in terms of the quantum chromo- dynamics (QCD) by using perturbative calculations.

Solution method:
Eikonal formalism is used to describe the geometrical property of hadrons. The whole collision process is reduced to a series of basic interactions, or the cut Pomerons in the Regge theory. The evolution of particle production process is modelled with a self-similar branching mechanism.

Restrictions:
The program is applicable at collision energy sqrt(s) < 100 GeV, but must be modified to include hard collision if sqrt(s) exceeds 100 GeV.

Running time:
Depends on energy. An example: pp collision at sqrt(s) = 22 GeV, approximately 50 events/s.