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Changes between Version 3 and Version 4 of WikiStart


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Timestamp:
May 18, 2017 5:08:07 PM (19 months ago)
Author:
graeme
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  • WikiStart

    v3 v4  
    1010This mode is selected by choosing `p p -> e+ e-` as your process in Herwig, and setting
    1111{{{
    12 set KrkNLO:Mode Z
     12set KrkNLOEventReweight:Mode Z
    1313}}}
    1414
     
    1818This mode is selected by choosing `p p -> H` as your process in Herwig, and setting
    1919{{{
    20 set KrkNLO:Mode H
     20set KrkNLOEventReweight:Mode H
    2121}}}
    2222as well as `read Matchbox/HiggsEffective.in`
     
    2828== Options
    2929=== Scale Settings
    30 There are options that set the argument of AlphaS for the real emission correction, `KrkNLO:AS_R`, and the virtual+soft correction, `KrkNLO:AS_V`. The possible options are:
     30There are options that set the argument of AlphaS for the real emission correction, `KrkNLOEventReweight:AS_R`, and the virtual+soft correction, `KrkNLOEventReweight:AS_V`. The possible options are:
    3131  * AS_R: `Q2`, `M2`, `Freeze`
    3232  * AS_V: `Q2`, `M2`
     
    3838
    3939=== PDF Type
    40 TO BE DOCUMENTED
     40The options available for the type of PDF are `MCDY`, and `MC` which refer to the type of MC-scheme PDF. These are selected via the interface `KrkNLOEventReweight:PDF`, as shown here
     41{{{
     42set KrkNLOEventReweight:PDF MC
     43}}}
    4144
     45  Note::
     46    The PDF type here '''must''' match the chosen PDF.
    4247
    4348== Using Monte Carlo scheme PDFs
    4449
    45 The MC-scheme PDFs are available in [https://krknlo.hepforge.org/hg/mc-pdf this repository], and are stored as  [https://lhapdf.hepforge.org LHAPDF] `.LHgrid` files.
     50=== Obtaining the PDFs
     51The MC-scheme PDFs are available in [https://krknlo.hepforge.org/hg/mc-pdf this repository], and are stored as [https://lhapdf.hepforge.org LHAPDF] `.LHgrid` files.
    4652
    4753The repository contains MC-scheme PDF, which are converted from their correspondingly named MSbar PDF, and are prefixed with either `MCDY_`,  or `MC_`, with the former denoting the ''Drell-Yan'' only variant  and the latter denoting the ''full'' conversion.
     
    5561export LHAPATH=/path/to/mc-pdf:$LHAPATH
    5662}}}
     63
     64=== Setup
     65To set the MC-scheme PDF in Herwig one can use the following snippet, replacing `MC_MMHT2014lo68cl.LHgrid` with the required MC-scheme PDF:
     66{{{
     67
     68  cd /Herwig/Partons
     69
     70  set HardLOPDF:PDFName MC_MMHT2014lo68cl.LHgrid
     71  set HardNLOPDF:PDFName MC_MMHT2014lo68cl.LHgrid
     72
     73  set ShowerLOPDF:PDFName MC_MMHT2014lo68cl.LHgrid
     74  set ShowerNLOPDF:PDFName MC_MMHT2014lo68cl.LHgrid
     75
     76  set MPIPDF:PDFName MC_MMHT2014lo68cl.LHgrid
     77  set RemnantPDF:PDFName MC_MMHT2014lo68cl.LHgrid
     78 
     79}}}
     80
     81The file `$HERWIG_ENV/share/Matchbox/MMHT2014.in` can be used a a reference on how to set PDFs within Herwig.