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Precise Higgs-background predictions : merging NLO QCD and squared quark-loop corrections to four-lepton + 0,1 jet production.

Cascioli, F. and Höche, S. and Krauss, F. and Maierhöfer, P. and Pozzorini, S. and Siegert, F. (2014) 'Precise Higgs-background predictions : merging NLO QCD and squared quark-loop corrections to four-lepton + 0,1 jet production.', Journal of high energy physics., 2014 (1). p. 46.


We present precise predictions for four-lepton plus jets production at the LHC obtained within the fully automated Sherpa + OpenLoops 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 → 4ℓ, gg → 4ℓ + g, gq → 4ℓ + q, and qq¯¯qq¯ → 4ℓ + g channels. These NLO and NNLO contributions are matched to the Sherpa parton shower, and the 0- and 1-jet final states are consistently merged using the Meps@Nlo 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 Cms 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.

Item Type:Article
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Publisher statement:Open Access, © The Authors. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:No date available
Date deposited:08 April 2016
Date of first online publication:10 January 2014
Date first made open access:No date available

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