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SUBROUTINE QIKGAM - Generate 4-momentum of virtual photon
In this subroutine the 4-momentum of the virtual photon,
,
with
, is generated. It assumes
and that
with
(i.e. incoming
goes in
direction).
According to a Sudakov decomposition, the 4-momentum of the virtual photon is
expressed as
The azimuthal angle
,
,
is randomly generated for default setting of the control flags. Otherwise,
is fixed at zero, i.e.
(the 4-momentum of the scattered
) and
are lying in the
plane.
Table 1:
Variables set in QIKGAM.
Name |
Description |
QIPGAM(1) |
 |
QIPGAM(2) |
 |
QIPGAM(3) |
 |
QIPGAM(4) |
 |
|
Up: QCDINS homepage
Previous: Package description
A. Ringwald
and F. Schrempp
1999-08-21