FORMCALC PDF

This addresses the problem some users experienced, in which FormCalc saved an "empty" data file in some instances when layout data had not changed. This required switching to a new license management system, so prior-version license codes will not work with this version. If your license was purchased within the prior year, email us to request a new code, free of charge. If your license is more than one year old you must purchase an upgrade, here. Fixed minor bugs.

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This addresses the problem some users experienced, in which FormCalc saved an "empty" data file in some instances when layout data had not changed. This required switching to a new license management system, so prior-version license codes will not work with this version. If your license was purchased within the prior year, email us to request a new code, free of charge. If your license is more than one year old you must purchase an upgrade, here.

Fixed minor bugs. If you are a licensed user of a prior version, your current license codes will not work with this or later updates. If you purchased FormCalc within one year prior to of today, email Customer Service to obtain new license code.

If you purchased more than one year ago, visit our Online Ordering page to purchase an upgrade and obtain new license code s. Updated the location where FormCalc writes log files to be more broadly compatible. It only occurred if the last column being written to by FormCalc was the Quantity column and the Item on that form line had multiple units of measure enabled.

This problem was rarely encountered.

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Returns the absolute value of a numeric value or expression. None Locates the starting character position of a string within another string. None Returns the whole number greater than or equal to a given number. None Returns the concatenation of two or more strings.

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It reads diagrams generated with FeynArts and returns the results in a way well suited for further numerical and analytical evaluation. FormCalc can in fact write out a complete Fortran or C subroutine to compute the squared matrix element for a given process. In addition to a comprehensive manual, several demo calculations are included in the FormCalc distribution, which show how the programs are used. What it does The following simplifications are performed by FormCalc: indices are contracted as far as possible, fermion traces are evaluated, open fermion chains are simplified using the Dirac equation, color structures are simplified using the SU N algebra, the tensor reduction is done, local terms the remnants of divergent integrals are added, the results are partially factored, abbreviations are introduced. The output is in general a linear combination of loop integrals with prefactors that contain model parameters, kinematic variables, and abbreviations introduced by FormCalc. Such abbreviations are introduced for spinor chains, scalar products of vectors, and epsilon tensors contracted with vectors. A term in the output could for instance look like The automatic introduction of abbreviations by FormCalc is a very important feature which can drastically reduce the size of an amplitude, particularly so because the abbreviations are nested in three levels.

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The FormCalc Visitor Center

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