Cross section with average = event_norm
Hello,
I am generating events with a Z' model (Z->mumu, one muon radiates a Z' which then decays to another two muons), with PDF NNPDF30_nlo_as_0118 (260000). Please see the details in the end.
When I use "average = event_norm", I get the cross section of 2.355e-4 fb with 33600 number of events
When I use "sum = event_norm", I get the cross section of 9.96527 fb
My question is should I use the 9.96 fb or 2.355e-4*33600 = 7.9128 fb for the correct cross section, and why they are different?
Thanks a lot!
Best,
Bing Li
import model Leptophilic_UFO
define p = g u c d s u~ c~ d~ s~
define j = g u c d s u~ c~ d~ s~
define l+ = e+ mu+
define l- = e- mu-
define vl = ve vm vt
define vl~ = ve~ vm~ vt~
define p = g u c d s b u~ c~ d~ s~ b~
define j = g u c d s b u~ c~ d~ s~ b~
set group_subprocesses Auto
set ignore_
set gauge unitary
set complex_mass_scheme False
generate p p > mu+ mu- Zp, Zp > mu+ mu-
output -f -nojpeg
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