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Дата изменения: Tue Aug 15 14:34:46 2000 Дата индексирования: Mon Oct 1 22:39:15 2012 Кодировка: |
There are several sets of disribution functions presented by CTEQ
collaboration which describe the densities of quarks and gluons in
(anti)proton. In CompHEP we have implemented the
CTEQ4m[CTEQ-1997] set.
Apart from the Feynman variable they depends on
the QCD-scale parameter .
The available range is
The CTEQ4m set of functions is produced in the framework of the next-to-leading calculations in the standard scheme with . See further explanations in [CTEQ-1997].