Missing PDF variation (Systematics) for LO Process
Hi Folks,
I am trying to extract the PDF variation for a loop-induced process using the CT14qed_inc_proton PDF set (lhaid=13400, 31 members). Unfortunately, mg5 Systematics is telling me that it is not possible. To clarify, this is also an issue for
CT14qed_proton (lhaid=13300) but *not*
CT14nlo (lhaid=13100, 57 members),
NNPDF23_
MSTW2008lo68cl (lhaid=21000, 41 members).
I am wondering if this is an issue with Systematics in mg5 or a problem with the PDF sets themselves and any input would be very much appreciated.
Best Wishes,
Richard
INFO: #******
#
# original cross-section: 14.076
# scale variation: +28.4% -22%
# central scheme variation: +16.3% -3.12e-09%
# PDF variation: missing combination
For, say, MSTW2008lo68cl (lhaid=21000, 41 members) I get:
INFO: #******
#
# original cross-section: 20.348
# scale variation: +29.3% -22.1%
# central scheme variation: +22.2% -8.19e-10%
# PDF variation: +1.06% -1.79%
The above can be reproduced with the following:
generate g g > h [QCD]
launch
set lhc 14
set nevents 400
set pdlabel lhapdf
set lhaid 13400
set no_parton_cut
done
launch
set lhaid 21000
done
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- Olivier Mattelaer
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