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PROGRAM SUMMARY
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**
Title of program:
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TTGlib, version 2.0
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Catalogue identifier:
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ADKZ
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Ref. in CPC:
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124(2000)243
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Distribution format: ** tar gzip file
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Operating system: ** UNIX, HP-UX 10.2
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High speed store required:
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1MK words
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Number of bits in a word:
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32
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Number of lines in distributed program, including test data, etc:
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215118
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Programming language used: ** Fortran

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Nature of physical problem:
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The process e+e- -> tau+tau-(etagamma), tau+- -> X+- provides important
observables, which are sensitive to parameters of the standard
electroweak theory as well as possible effects of new physics. A Monte
Carlo simulation of this process is necessary in order to evaluate the
effects of the experimental apparatus and QED bremsstrahlung on the
observables in question. Simultaneous control of the precise Standard
Model predictions and contributions due to hypotethical new physics
exptensions is mandatory in such studies.

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Method of solution
**

The Monte Carlo simulation of tau+tau-(etagamma) production and decay,
augmented by the calculation of weights incorporating effects due to SM
and anomalous tautaugamma couplings. Calculation of these weights is
performed in TTGlib library. Powerful reweighting methods and fitting
with the help of a Monte Carlo sample are thus possible for experimental
measurements of anomalous couplings.

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Restrictions on the complexity of the problem
**

The high precision of the program may vary depending on the input
parameters. See details in Long Write-up. Maximum centre-of-mass
energy allowed is 200GeV.

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Unusual features of the program
**

Main programs and other libraries published independently in Comput.
Phys. Commun. must be loaded to run this library. There is no separate
distribution of the code prepared for this version of the library. It
is stored in its own sub-directory, archived with KORALZ, version 4.04
(Comput. Phys. Commun. 124(2000)233). The demonstration program for the
library is also provided there.