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Table 1 Signal and background processes and their corresponding MC generators used in this analysis.The acronyms ME and PS stand for matrix element and parton shower, respectively. The cross-section order refers to the order of the cross-section calculation used for process normalisation in QCD, unless otherwise stated, with ((N)N)LO and ((N)N)LL standing for ((next-to-)next-to-)leading order and ((next-to-)next-to-)leading log, respectively

From: Direct constraint on the Higgs–charm coupling from a search for Higgs boson decays into charm quarks with the ATLAS detector

Process

ME generator

ME PDF

PS and

Tune

Cross-section

hadronisation

order

\(qq \rightarrow VH\) \((H \rightarrow c{\bar{c}}/b{\bar{b}})\)

Powheg Boxv2 [56, 57]

NNPDF3.0nlo [58]

PYTHIA8.212 [59]

AZNLO [60]

NNLO(QCD)+NLO(EW) [61,62,63,64,65]

   + GoSam[66]

   + MiNLO [67, 68]

\(gg \rightarrow ZH\)

Powheg Boxv2

NNPDF3.0nlo

PYTHIA8.212

AZNLO

NLO+NLL [69, 70]

\((H \rightarrow c{\bar{c}}/b{\bar{b}})\)

\(t{\bar{t}}\)

Powheg Boxv2 [71]

NNPDF3.0nlo

PYTHIA8.230

A14 [72]

NNLO

+NNLL [73,74,75,76,77,78,79]

t/s-channel

Powheg Boxv2 [80]

NNPDF3.0nlo

PYTHIA8.230

A14

NLO [81, 82]

single top

Wt-channel

Powheg Boxv2 [83]

NNPDF3.0nlo

PYTHIA8.230

A14

Approx.

single top

NNLO [84, 85]

V+ jets

Sherpa2.2.1 [53,54,55]

NNPDF3.0nnlo [58]

Sherpa2.2.1

Default

NNLO [86]

\(qq \rightarrow VV\)

Sherpa2.2.1

NNPDF3.0nnlo

Sherpa2.2.1

Default

NLO

\(gg \rightarrow VV\)

Sherpa2.2.2

NNPDF3.0nnlo

Sherpa2.2.2

Default

NLO