Precise Higgs-background predictions: merging NLO QCD and squared quark-loop corrections to four-lepton + 0,1 jet production
Cascioli, F.; Höche, S.; Krauss, F.; Maierhöfer, P.; Pozzorini, S.; Siegert, F.
Professor Frank Krauss firstname.lastname@example.org
Royal Society Wolfson Fellow
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.
Cascioli, F., Höche, S., Krauss, F., Maierhöfer, P., Pozzorini, S., & 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), https://doi.org/10.1007/jhep01%282014%29046
|Journal Article Type||Article|
|Online Publication Date||Jan 10, 2014|
|Publication Date||Jan 10, 2014|
|Deposit Date||Mar 2, 2016|
|Publicly Available Date||Apr 8, 2016|
|Journal||Journal of High Energy Physics|
|Publisher||Scuola Internazionale Superiore di Studi Avanzati (SISSA)|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
Publisher Licence URL
Open Access, © The Authors. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons<br /> 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.
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