cross sections beyond SM
Hi! I'm new in madgraph, I´m interested in cross-sections in new models so I created an UFO file with Feynrules, I just introduced the chormomagnetic parameter: at. I would like to know how it affects the top-top production cross-section. I get the following result in the SM at 14TeV and MT=172.9 GeV
Cross section (pb)= 599.5 ± 0.93
then, I used the following .txt file
import model SMext_UFO
generate p p > t t~
output CMDM
launch -n run_at+mz
set ebeam1 7000
set ebeam2 7000
set MT 172.9
set at -.00193
launch -n run_atSM
set at 0
launch -n run_at+mz2
set at -.00193
so I get:
Cross section (pb)= 599.5 ± 0.93
Cross section (pb)=598.3 ± 0.82
Cross section (pb)= 598.2 ± 0.92
The first result is the same that the SM case and I think it should be different since there is a new factor at.
For the second result at=0 so I think It should be the SM result.
for the last result, I used the same value for "at" that in the first case, so I think both results should be the same.
I don't understand it, what I am missing?
and extra question: How different should be the madgraph results and the measurements in ATLAS or CMS?? for example for tt production cross-section?
thanks in advance
Alan
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