Running LanHEP and the command line options

As mentioned above, LanHEP can read the model description from the input file prepared by the user. To start LanHEP write the command

lhep filename options

where the possible options are described in the next section. If the filename is omitted, LanHEP prints it's prompt and waits for the keyboard input. In the last case, user's input is copied into the file lhep.log and can be inspected in the following. To finish the work with LanHEP, type 'quit.' or simply press ^D (or ^Z at MS DOS computers).

Options

Possible options, which can be used in the command line to start LanHEP are:

-OutDir directory Set the directory where output files will be placed.

-InDir directory Set the default directory where to search files, which included by read and use statements.

-tex LanHEP generates LaTeX files instead of CompHEP model tables.

-frc If -tex option is set, forces LanHEP to split 4-fermion and 4-color vertices just as it is made for CompHEP files.

-texLines num Set number of lines in LaTeX tables to num. After the specified number of lines, LanHEP continues writing current table on the next page of LaTeX the output. Default value is 40.

-texLineLength num Controls width of the Lagrangian table. Default value is 35, user can vary table width by changing this parameter.

-nocdot removes $\backslash$cdot commands between the parameters symbols in the LaTeX output. This option is useful when all parameters have prescribed LaTeX names.

-c4 produces the output files for CompHEP version 4x.xx, which has slightly different format than 3x.xx.

-allvrt produces CompHEP-like ouput with all vertices of the Lagrangian, including 1-leg and 2-leg ones which contribute to the mass matrix. Vertices with more than 4 legs are also in the output (this is not supported by CompHEP now).

-evl num For the lengthly expression in a vertex (more then num monomials) an auxiliary variable is generated, and the expression is stored in the parameters table. This allows to increase significantly the speed of symbolic calculation of the matrix element by CompHEP. num=2 is recommended.