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Fixes for VBF HNL [skip modfiles]

Yi Yu requested to merge yi-VBFHNL into master

Description of bug

ATLMCPROD-10937

As Ana suggested:

  • in most of the Higgs analysis, the A14 tune is now used. It will not make any big change and AZNLO is not wrong.
  • for VBF topologies the default Pythia parton shower understands that the two quarks in the final state are color connected and, thus, has a much larger qcd emission than expected in the gap region. The correct color treatment can be achieved by using the following option in the JO: genSeq.Pythia8.Commands += ['SpaceShower:dipoleRecoil = on']

Changes introduced

include('Pythia8_i/Pythia8_A14_NNPDF23LO_EvtGen_Common.py')

include("Pythia8_i/Pythia8_Powheg_Main31.py")

genSeq.Pythia8.Commands += ['SpaceShower:dipoleRecoil = on']

Tests

Issues resolved

Closes #

Edited by Yi Yu

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