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Manuscript Title: HDECAY: a program for Higgs boson decays in the standard model and its supersymmetric extension.
Authors: A. Djouadi, J. Kalinowski, M. Spira
Program title: HDECAY
Catalogue identifier: ADHB_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 108(1998)56
Programming language: Fortran.
RAM: 0.3M words
Word size: 64
Keywords: Particle physics, Elementary, Qcd, Higgs boson, Minimal supersymmetric, Standard model.
Classification: 11.5.

Nature of problem:
Decay widths and branching ratios for Higgs boson decays in the Standard Model and the Minimal Supersymmetric Standard Model are calculated numerically, including loop corrections according to the current theoretical knowledge.

Solution method:
One- and two-dimensional numerical integration of analytic formulae for Higgs boson decays into off-shell particles. All other decay widths are calculated analytically. The transition between off-shell and on-shell decays is performed by a linear interpolation.

Restrictions:
The program calculates only decay widths and branching ratios of all types of Higgs bosons, within the Standard Model and its minimal supersymmetric extension, but no distributions. For the phenomenologically relevant ranges of the input parameters the program runs without problems.

Running time:
Less than one second per mass value for each type of Higgs boson.