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Manuscript Title: Monte Carlo phase space evaluation.
Authors: M.M. Block
Program title: NUPHAZ
Catalogue identifier: ACGJ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 69(1992)459
Programming language: Fortran.
Computer: VAX.
Operating system: VMS.
RAM: 12K words
Keywords: Particle physics, Elementary, Phase space, Multiparticle, Monte carlo, Event generation, Unit weight events, Effective masses, Lorentz-invariant.
Classification: 11.2.

Nature of problem:
Generation of multiparticle events distributed randomly and uniformly in Lorentz-invariant phase space.

Solution method:
A new method for massive particles based on comparison with the exact integrals for zero-mass particles.

Restrictions:
The program as distributed can handle up to 30 outgoing particles, but it is trivial to redimension it for a larger number.

Unusual features:
It can be used to generate unit-weight events efficiently.

Running time:
About a millisecond per event and per outgoing particle on a 25 Megaherz 80386 machine with a 80387 math coprocessor.