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Manuscript Title: OPUCEM: A Library with Error Checking Mechanism for Computing Oblique Parameters
Authors: Özgür Cobanoglu, Erkcan Özcan, Saleh Sultansoy, Gökhan Ünel
Program title: OPUCEM (library)
Catalogue identifier: AEIW_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 182(2011)1732
Programming language: C/C++.
Computer: PCs and Workstations.
Operating system: Any unix based system such as Linux and MacOSX, partial testing with Cygwin under Windows.
RAM: GUI takes about 25MB, the individual library calls are negligible
Keywords: EW precision data, Oblique Parameters, standard model, 4th family.
PACS: 10.13.
Classification: 11.1, 11.6.

External routines: ROOT library set (optional), complex number constructs from either the C99 standard or from the C++ Technical Report 1 (ISO/IEC TR 19768)

Nature of problem:
The calculation of Electroweak Precision variables for each point of the parameter space of a given beyond the Standard Model theory is tedious and error prone. The available formulas in the literature sometimes contain typos and most of the time they are valid only under some specific conditions, not suitable for quick comparison across different studies nor direct implementation on a computer.

Solution method:
One loop exact calculation of the oblique parameters are collected into a freely available C/C++ library for a number of models. One-loop exact calculation of the contributions of a number of models to the oblique parameters are collected in a freely available C/C++ library. The public availability of the implementations and the internal error checking mechanism aim the correctness of the results. Additionally, the Graphical User Interface and auxiliary tools provide the means for rapid result comparison or update when new data becomes available.

Unusual features:
The library computes the oblique parameters S, T and U both with exact one-loop calculations and with well-defined approximations for a number of models to establish a certain level of confidence. The comparisons between exact and approximate computations, and amongst formulas from different papers provide an error checking machinery which improves the end user reliability.

Running time:
Fractions of a second for each function call