A check was done by comparing the cross-section with LPAIR.
Only 2-
BH diagrams (see Fig.1-(a) or Fig.2-(a)
without Z
contribution)
are used in the GRAPE calculation.
As a sample process we have chosen
with 27.5GeV positron and 820GeV proton beams.
Good agreement was obtained within the integration precision of 0.1%
as shown in Table1,
where
in the run with Cut-
both muons are required to be in 
and have 
GeV,
and
in the run with Cut-
the scattered positron is required to be in
and have 
GeV
in addition to the Cut-
.
In the above, 
and E means polar angle and energy, respectively.
For quasi-elastic processes, an additional cut of 
is applied.
In DIS processes, GRV94(LO) [13] parton distributions are used
with (QCD scale)
> 4GeV.
| GRAPE | LPAIR | |
Elastic( = ) | ||
| No cut |  |  |
Cut- |  |  |
Cut- |  |  |
Quasi-elastic(+ <<5GeV) | ||
Cut- |  |  |
Cut- |  |  |
| DIS with GRV94(LO)(>5GeV) | ||
Cut- |  |  |
Cut- |  |  |
[Cross-section comparison with the generator LPAIR]
Cross-section comparison with the generator LPAIR (in units of pb)
for the process
including the BH diagrams.
The applied cuts are described in the text.