Vector Boson Fusion Process

General information


  • Antonio Di Maria (Nanjing University), Yacine Haddad (Northeastern University), Alexander Karlberg (Oxford), Simon Plätzer (Vienna)



Topics covered by the group

  • Simplified Template Cross Sections uncertainties:
    • LHC analyses will provide results using categories defined by the Simplified Template Cross Sections method, mainly Stage 0 and Stage 1
    • Estimation of the systematic uncertainties in each bin is needed
  • Higher-order corrections:
    • While NNLO QCD and NLO EWK exist at the fixed order, no prescriptions are available on how to apply them to events generated after parton shower and underlying event simulation.
    • Prescription on how to reweight existing simulations to NNLO QCD and NLO EWK without affecting the simulation precision could be subject of a publication
  • Jet multiplicities merging and parton shower accuracy:
    • Comparisons between different merged samples and between different showering options
    • Possible new recommendations on the central value and on the uncertainties to be adopted in analyses
  • CJV systematics:
    • Estimation based on ST gives an overestimation of the uncertainties which has then a high impact on the final result
    • Possible redefinition of the uncertainty and updated recommendations for more sophisticated analysis based on a multivariate discriminant
  • Higgs spin in VBF
    • The Higgs spin can be constrained by looking at VBF jets as well
    • Do we have all the needed tools available to do it and to combine the results with other spin studies in ATLAS and CMS?
  • High Higgs pT:
    • First measurements of the high-pT Higgs spectrum (above 0.5 TeV) are being published
    • Dedicated calculations to account for finite quark mass effects at higher orders in QCD and with additional jets are needed to be compared to data

Topic Timescale Manpower needed Contacts Last update Comments Status
Simplified Template Cross Sections uncertainties Spring/Summer 2020 1-2 persons Updates on STXS bin definitions, uncertainties for VBF and VH bins Frank' slides Latest uncertainties estimation, 2020 Update, Tool   Complete: 90/100
Jet multiplicities merging and Parton shower accuracy >Summer 2020 2 persons
CJV and PS   Complete: 30/100
Higher-order corrections >2021 1-2 persons       Complete: 0/100
Parton Shower
Summer 2020 1-2 persons
Paper   Complete: 50/100
Higgs Boson Plus Dijets >2020 2 persons Higgs Boson Plus Dijets   Complete: 30/100
High pT Higgs Winter 2019 1 person Recommended predictions for the boosted-Higgs cross section Note working on EW correction Complete: 100/100
Higgs XS for a 27 TeV pp Summer 2018 1 person   Results Ready for YR Complete: 100/100

Information on Simplified Template Cross Sections

  • STXS-VBS-EWCorrections.png

VBF Calculation for YR4

VBF cross-sections for YR4 (and beyond)

The VBF cross-sections as computed in the YR4 are reported here considering Higgs Boson mass of 125 GeV . The setup can be found in the YR4 itself. For the 13/14/27 TeV cross sections the EW, s-channel, and photon cross sections have been computed using LUXqed_plus_ PDF4LHC _nnlo_100 and hence the 13/14 TeV cross sections differ slightly from those reported in the YR4 where NNPDF23_nlo_as_0118_qed was used. The QCD cross-section was computed at NNLO with proVBFH and the EW/photon contributions have been computed at NLO with HAWK.

We note that the photon-induced contribution is more reliably predicted here than was the case in the YR4 due to the LUXqed method. In particular, the photon PDF should no longer be considered as a source of uncertainty as in eq. (I.5.7) in the YR4, as it is now constrained at the percent level. Quantitatively the photon-induced contributions are reduced by about 30% compared to in the YR4.

The s-channel contributions at 13 and 14 TeV have on the other hand increased compared to the YR4 results. This is due to the updated PDF used for this prediction, i.e. LUXqed_plus_PDF4LHC15_nnlo_100 instead of NNPDF23_nlo_as_0118_qed. We also note that the relative size of the s-channel decreases as the collider energy increases - from 47% at 7 TeV to 30% at 27 TeV.

Available Tools

  • VV2H ( M. Spira):
  • VBFNLO ( K. Arnold, M. Bahr, G. Bozzi, F. Campanario, C. Englert, T. Figy, N. Greiner, C. Hackstein, V. Hankele, B. Jager, G. Klamke, M. Kubocz, C. Oleari, S. Plätzer, S. Prestel, M. Worek, D. Zeppenfeld):
  • * HJets ( F. Campanario, T.M. Figy, S. Plätzer and M. Sjödahl)
  • HAWK ( A. Denner, S. Dittmaier, A. Mück):
  • POWHEG BOX ( S. Alioli, K. Hamilton, P. Nason, C. Oleari, E. Re):
  • PHANTOM ( A. Ballestrero, A. Belhouari, G. Bevilacqua, D. Buarque Franzosi, V. Kashkan and E. Maina):
  • VBF@NNLO ( P. Bolzoni, F. Maltoni, S.-O. Moch and M. Zaro):
  • proVBFH ( M. Cacciari, F. Dreyer, A. Karlberg, G. Salam, G. Zanderighi)
  • VBF-qq2Hqq-uncertainties ( C. Bertella, Y. Haddad )

Historical Meetings

Minutes of the meeting are attached to the Indico agenda page.

AlexanderKarlberg - 2017-06-09

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng STXS-VBS-EWCorrections.png r1 manage 330.9 K 2020-03-24 - 22:02 HaddadYacine  
PDFpdf VBFEnvelope.7TeV.pdf r1 manage 13.4 K 2010-11-21 - 15:14 DanielaMarcellaRebuzzi  
Unknown file formatgz deltaew.tar.gz r1 manage 8.4 K 2010-12-14 - 15:40 DanielaMarcellaRebuzzi  
Texttxt minutes.24042012.txt r1 manage 3.8 K 2012-05-02 - 09:52 DanielaMarcellaRebuzzi  
Texttxt minutes.VBF.09052012.txt r1 manage 2.5 K 2012-05-11 - 13:36 DanielaMarcellaRebuzzi  
Texttxt minutes_17.06.2010.txt r1 manage 2.9 K 2010-06-22 - 18:00 DanielaMarcellaRebuzzi  
PDFpdf noEWnoSch-7TeV-cteq66.Table-hm.pdf r2 r1 manage 45.4 K 2010-11-19 - 17:19 DanielaMarcellaRebuzzi  
PDFpdf noEWnoSch-7TeV-cteq66.Table-lm.pdf r2 r1 manage 45.9 K 2010-11-19 - 17:18 DanielaMarcellaRebuzzi  
Unknown file formatdat noEWnoSch-7TeV-cteq66.dat r1 manage 1.7 K 2010-11-26 - 09:49 DanielaMarcellaRebuzzi  
PDFpdf noEWnoSch-7TeV-mstw2008.Table-hm.pdf r2 r1 manage 46.1 K 2010-11-19 - 17:22 DanielaMarcellaRebuzzi  
PDFpdf noEWnoSch-7TeV-mstw2008.Table-lm.pdf r1 manage 46.7 K 2010-11-19 - 17:26 DanielaMarcellaRebuzzi  
Unknown file formatdat noEWnoSch-7TeV-mstw2008.dat r1 manage 1.7 K 2010-11-26 - 09:49 DanielaMarcellaRebuzzi  
Unknown file formatdat noEWnoSch-7TeV-nnpdf20.dat r1 manage 1.2 K 2010-11-26 - 09:49 DanielaMarcellaRebuzzi  
Unknown file formatgz outputfiles.tar.gz r1 manage 4171.8 K 2010-12-14 - 15:39 DanielaMarcellaRebuzzi  
Unknown file formatout result-pdf-cteq66-14.out r1 manage 0.9 K 2010-11-25 - 19:29 UnknownUser  
Unknown file formatout result-pdf-cteq66-7.out r1 manage 0.9 K 2010-11-25 - 19:29 UnknownUser  
Unknown file formatout result-pdf-mstw-14.out r1 manage 0.9 K 2010-11-25 - 19:30 UnknownUser  
Unknown file formatout result-pdf-mstw-7.out r1 manage 0.9 K 2010-11-25 - 19:30 UnknownUser  
PDFpdf results_H4lhc_714TeV.pdf r1 manage 12.7 K 2010-11-23 - 14:59 UnknownUser  
Unknown file formattex results_H4lhc_714TeV.tex r1 manage 2.4 K 2010-11-23 - 14:59 UnknownUser VBFNLO with EW corrections
PDFpdf siEWnoSch-14TeV-Envelope-hm.pdf r1 manage 52.8 K 2010-11-21 - 15:30 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-Envelope-lm.pdf r1 manage 52.8 K 2010-11-21 - 15:30 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-cteq66.Table-hm.pdf r2 r1 manage 48.0 K 2010-11-19 - 17:43 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-cteq66.Table-lm.pdf r2 r1 manage 48.7 K 2010-11-19 - 17:42 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-mstw2008.Table-hm.pdf r2 r1 manage 48.8 K 2010-11-19 - 17:43 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-mstw2008.Table-lm.pdf r2 r1 manage 49.4 K 2010-11-19 - 17:43 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-nnpdf20.Table-hm.pdf r2 r1 manage 56.4 K 2010-11-19 - 17:44 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-14TeV-nnpdf20.Table-lm.pdf r2 r1 manage 57.2 K 2010-11-19 - 17:44 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-Envelope-hm.pdf r1 manage 52.8 K 2010-11-21 - 15:27 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-Envelope-lm.pdf r1 manage 52.7 K 2010-11-21 - 15:27 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-cteq66.Table-hm.pdf r2 r1 manage 48.1 K 2010-11-19 - 17:21 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-cteq66.Table-lm.pdf r2 r1 manage 48.6 K 2010-11-19 - 17:20 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-mstw2008.Table-hm.pdf r3 r2 r1 manage 48.8 K 2010-11-19 - 17:37 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-mstw2008.Table-lm.pdf r1 manage 49.4 K 2010-11-19 - 17:46 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-mstw2008.Table-lm1.pdf r1 manage 49.4 K 2010-11-19 - 17:48 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-nnpdf20.Table-hm.pdf r2 r1 manage 56.2 K 2010-11-19 - 17:29 DanielaMarcellaRebuzzi  
PDFpdf siEWnoSch-7TeV-nnpdf20.Table-lm.pdf r2 r1 manage 56.7 K 2010-11-19 - 17:29 DanielaMarcellaRebuzzi  
PNGpng xsec.png r2 r1 manage 74.7 K 2018-07-26 - 15:32 AlexanderKarlberg  
PNGpng xsec2.png r1 manage 74.7 K 2018-07-26 - 15:32 AlexanderKarlberg  
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Topic revision: r65 - 2020-07-09 - HaddadYacine
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