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Manuscript Title: HEVOL: a Monte Carlo program to calculate the evolution of structure functions with the inclusion of heavy quark effects.
Authors: R. Odorico
Program title: HEVOL
Catalogue identifier: AAVH_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 25(1982)253
Programming language: Fortran.
Computer: CDC 7600.
Operating system: SCOPE 2.1.5, NOS/BE.
RAM: 22K words
Word size: 60
Peripherals: disc.
Keywords: Elementary, Particle physics, Heavy quark effects, Monte carlo generation, Quantum chromodynamics, Function structure Evolution, Leading logarithm Approximation.
Classification: 11.5.

Nature of problem:
Calculation of QCD evolution of structure functions including the effects of heavy quark production, with the immediate aim of determining relevant QCD parameters by least-square fits to experimental data.

Solution method:
Monte Carlo generation of QCD emission of quanta.

Unusual features:
Use of the CERN program library, and specifically of the minimization program MINUITS.

Running time:
In the test program set-up (singlet analysis of muon deep inelastic scattering data, 94 data points with Q**2 ranging from 2.8 to 200 GeV**2, minimum Bjorken's x 0.04, Lambda <= 0.5 GeV, and charmed sea contribution calculated separately) 137 s of CDC 7600 time to process 4 X 50000 Cascades for the calculation of kernels (which can be saved on disk for after use with the same data, or subset of them), and 0.03 s per call of the minimization program MINUIT (for convolutions done with 100x-bins). If non-singlet quantities only are needed the kernal calculation time reduces to about 15 s and the time per MINUIT call to 0.02 s, under the same conditions and minimum x 0.25.