Integrated weight and the cross section

Asked by Lailin Xu on 2018-02-13

Hi,

When I run LHE files generation from a gridpack, I find that in the LHE file header, the "Integrated weight" and the cross section number shown in the "<init>" event header are not the same. For example,

<MGGenerationInfo>
# Number of Events : 5500
# Integrated weight (pb) : 0.0985250476819
</MGGenerationInfo>
</header>
<init>
2212 2212 6.500000e+03 6.500000e+03 0 0 262000 262000 -3 1
1.036085e-03 1.538543e-05 1.788850e-05 1
<generator name='MadGraph5_aMC@NLO' version='5.2.4.3'>please cite 1405.0301 </generator>
</init>

The integrated weight is 0.0985250476819, while in "<init>" the cross section is "1.036085e-03".
Do you have any idea why this should happen?
Sorry if I misread the information from the LHE file.

Thanks,
Lailin

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2018-02-13
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