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Precise Higgs-background predictions: merging NLO QCD and squared quark-loop corrections to four-lepton + 0,1 jet production
Ist Teil von
The journal of high energy physics, 2014, Vol.2014 (1), p.1-45, Article 46
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2014
Quelle
SpringerLink
Beschreibungen/Notizen
A
bstract
We present precise predictions for four-lepton plus jets production at the LHC obtained within the fully automated S
herpa
+ O
pen
L
oops
framework. Off-shell intermediate vector bosons and related interferences are consistently included using the complex-mass scheme. Four-lepton plus 0- and 1-jet final states are described at NLO accuracy, and the precision of the simulation is further increased by squared quark-loop NNLO contributions in the gg → 4
ℓ
, gg → 4
ℓ
+ g, g
q
→ 4
ℓ
+
q
, and
→ 4
ℓ
+ g channels. These NLO and NNLO contributions are matched to the S
herpa
parton shower, and the 0- and 1-jet final states are consistently merged using the M
eps
@N
lo
technique. Thanks to Sudakov resummation, the parton shower provides improved predictions and uncertainty estimates for exclusive observables. This is important when jet vetoes or jet bins are used to separate four-lepton final states arising from Higgs decays, diboson production, and top-pair production. Detailed predictions are presented for the Atlas and C
ms
H → WW
*
analyses at 8 TeV in the 0- and 1-jet bins. Assessing renormalisation-, factorisation- and resummationscale uncertainties, which reflect also unknown subleading Sudakov logarithms in jet bins, we find that residual perturbative uncertainties are as small as a few percent.