Документ взят из кэша поисковой машины. Адрес оригинального документа : http://theory.sinp.msu.ru/comphep_html/tutorial/node20.html
Дата изменения: Wed Aug 9 20:40:47 2000
Дата индексирования: Mon Oct 1 22:41:24 2012
Кодировка:

Menu 3.

Information about a model is stored in four tables. Generally they are text files which are disposed in user's models directory and may be corrected by an ordinary text editor. But we strongly recommend to use CompHEP  facilities to edit these files because in this case CompHEP  can control possible mistakes of the user input.

CompHEP  displays a menu of model tables. By choosing a position of this menu you can edit the corresponding part of the model.

The Parameters, Constraints, Particles and Vertices menu functions let you browse and edit correspondingly:

1. independent parameters of the chosen model;

2. parameters depending on the basic ones;

3. list of particles and their properties;

4. vertices of interaction.

See Section for the format of these tables and also Section for the explanation of facilities of the table editor.

CompHEP  verifies the model when you try to leave this menu after some changes made in one of the tables. If some error is detected the corresponding message appears and no exit from the menu occurs. This message contains the diagnostics, the table name, and the number of line where the error has been detected. You can recall this message later on within the table editor by pressing the Ctrl E key.

The check stops when the first error is detected. You can fix the error and try to leave the Edit Model menu once more.

When you enter the Edit Model menu the current version of the model is saved and you have a possibility to return to this version forgetting your corrections. Just answer N the question

Save correction ?

Y/N?

which appears every time when you try to leave this menu after correcting the model.

There is a sequence of points which are being checked:

• correctness of identifiers and numbers;
• declaration of an identifier before its use in the expression;
• declaration of a particle before its use in the vertex;
• correctness of algebraic expressions;
• compatibility of Lorentz indices;
• existence of the conjugated vertex.

See Section for a full list of requirements on the model.