Commit 5ccacd9c authored by Marek Schoenherr's avatar Marek Schoenherr Committed by Enrico Bothmann

update manual to new example and scale variation capabilities

(cherry picked from commit f6d5a00c)
parent 79ba7d8b
......@@ -1179,3 +1179,5 @@
@mybibitem{Beazley2003,Bea03,D. M. Beazley, Automated scientific software scripting with SWIG,Future Generation Computer Systems,19,(2003),599-609,,}
@mybibitem{Buschmann2014sia,Bu03,M. Buschmann and others, Mass Effects in the Higgs-Gluon Coupling: Boosted vs Off-Shell Production, JHEP, 1502, (2015),038, [hep-ph/1410.5806]}
@mybibitem{Bothmann2017jfv,Both17,E. Bothmann and M. Schonherr and F. Krauss, Single top-quark production with Sherpa, [arXiv:1711.02568]}
@mybibitem{Kallweit2015dum,Kal15, S. Kallweit and J. M. Lindert and P. Maierhofer and S. Pozzorini and M. Schonherr}
@mybibitem{Gutschow2018tuk,Gut18,C. Gutschow and J. M. Lindert and M. Schonherr, Multi-jet merged top-pair production including electroweak corrections, Eur. Phys. J., C78,(2018),317, [arXiv:1803.00950]}
......@@ -73,6 +73,7 @@ of the main features of these examples.
@menu
* Top quark pair production::
* Top quark pair production including approximate EW corrections::
* Tops plus W in MC@@NLO::
@end menu
......
......@@ -14,4 +14,23 @@ Things to notice:
for massive particles, as described in @mycite{Hoeche2013mua}.
@item A non-default METS core scale setter is used, cf. @ref{METS scale setting with multiparton core processes}
@item We enable top decays through the internal decay module using @option{HARD_DECAYS 1}
@item We calculate on-the-fly a 7-point scale variation, cf. @ref{Scale and PDF variations}.
@end itemize
@node Top quark pair production including approximate EW corrections
@subsection Top quark pair production including approximate EW corrections
@example
@smallformat
@verbatiminclude Examples/Tops_plus_Jets/LHC_Tops/Run.EWapprox.dat
@end smallformat
@end example
Things to notice:
@itemize
@item In addition to the setup in @ref{Top quark pair production} we add approximate EW corrections, cf. @mycite{Gutschow2018tuk}.
@item Please note: this setup currently only works with a beta version of the upcoming OpenLoops release.
@item The approximate EW corrections are added as additional variations on the event weight.
@end itemize
......@@ -407,11 +407,12 @@ Sherpa can compute alternative event weights for different scale and
PDF choices on-the-fly, resulting in alternative weights for the generated
event. The can be evoked with the following syntax
@verbatim
SCALE_VARIATIONS <muR-fac-1>,<muF-fac-1>[,<PDF-1>] <muR-fac-1>,<muF-fac-1>[,<PDF-1>] ...
SCALE_VARIATIONS <muR-fac-1>,<muF-fac-1>[,<PDF-1>[,<associated-contrib-1>]] <muR-fac-1>,<muF-fac-1>[,<PDF-1>[,<associated-contrib-1>]] ...
@end verbatim
The key word @code{SCALE_VARIATIONS} takes a space separated list of
variation factors for the nominal renormalisation and factorisation scale
and an associated PDF set. Any set present in any of the PDF library interfaces
variation factors for the nominal renormalisation and factorisation scale,
an associated PDF set and associated approximate NLO EW and sub-leading order
contributions. Any set present in any of the PDF library interfaces
loaded through @code{PDF_LIBRARY} can be used. If no PDF set is given it
defaults to the nominal one. Specific PDF members can be
specified by appending the PDF set name with @code{/<member-id>}. The
......@@ -432,6 +433,12 @@ Thus, a complete variation using the PDF4LHC convention would read
Please note, this syntax will create 7+53+51+101=212 additional weights
for each event.
Similarly, the associated NLO EW and sub-leading order contributions can
be included orthogonally to scale and PDF variations through
@verbatim
ASSOCIATED_CONTRIBUTIONS_VARIATIONS EW EW|LO1 EW|LO1|LO2 EW|LO1|LO2|LO3;
@end verbatim
The additional event weights can then be written into the event output.
However, this is currently only supported for @code{HepMC_GenEvent} and
@code{HepMC_Short} with versions >2.06 and @code{HEPMC_USE_NAMED_WEIGHTS=1}.
......
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