VH calculations of the LHC HXSWG for the yellow report number 4

Standard Model parameters

See document at https://cds.cern.ch/record/2047636/files/LHCHXSWG-INT-2015-006.pdf

Phase space requirements/classification

For Higgs decaying into b-quarks, the following phase space cuts need to be applied to the daughers b-jets:

  • b-jets: |η| <2.5, pT > 25 GeV

If the Higgs boson is not decayed, then the b-jet cuts are to be ignored.

Z(ll)H(bb)

  • Z pT bins: inclusive, [0-100 GeV], (100 GeV-200 GeV], >200 GeV
  • leptons: |η| <2.5, pT > 15 GeV
  • mll in range [75-105 GeV]

Z(νν)H(bb)

  • Z pT bins: inclusive, [0-150 GeV], (150 GeV-250 GeV], >250 GeV

W(lν)H(bb)

  • W pT bins: inclusive, [0-150 GeV], (150 GeV-250 GeV], >250 GeV
  • leptons: |η|<2.5, pT > 15 GeV
  • neutrinos: pT > 15 GeV

Additional jet counting

  • Additional jets count if pT > 20 GeV and |η| < 4.5

This jet counting helps define the exclusive VH+0-jet and VH+1-jet regions.

Proposed plots (histograms) for Yellow Report 4

100 bins each

  • 0 < pT_H < 500 (a)
  • -5 < y_H < 5 (b)
  • 0 < pT_lepton < 500 (c)
  • 0 < pT_nu/nubar < 500 (d)
  • -5 < y_lepton < 5 (e)

For the other 5 plots above (a-e) we are going to produce 4 sets of plots:

  • one set inclusive over pT_W/Z and
  • one set for each of the 3 pT_W/Z bins reported on the wiki page.

The plot below (1) can be produced for the inclusive case only

  • 0 < pT_W/Z < 500 (1)

Differential cross sections from HAWK (NLO QCD and NLO EW):

  • histograms for EW corrections & photon-induced in text format: VH-NLO-distributions.tar.gz
    • column 1: kinematical quantity on x-axis (x = left corner of bin)
    • column 2: Monte Carlo average for the Born cross-section
    • column 3: Monte Carlo error for the Born cross-section
    • column 4: Monte Carlo average for the complete cross-section
    • column 5: Monte Carlo error for the complete cross-section
    • column 6: Monte Carlo average for virt+real ew cross-section
    • column 7: Monte Carlo error for virt+real ew cross-section
    • column 8: Monte Carlo average for virt+real QCD cross-section
    • column 9: Monte Carlo error for virt+real QCD cross-section
    • column 10: Monte Carlo average for incoming photon cross-section
    • column 11: Monte Carlo error for incoming photon cross-section
    • column 12: Monte Carlo average for incoming gluon cross-section
    • column 13: Monte Carlo error for incoming gluon cross-section

Differential cross sections from VHNNLO (NNLO QCD):

How to combine the NLO EWK and NNLO QCD corrections (work in progress)

The "deltaEW" can be built making the bin by bin ratio between column 6 and column 2 (nloEW/bornEW). The Born terms don't fully coincide exactly because of PDF. The idea is to multply the NNLO QCD-DY like prediction for the deltaEW factor (the EW correction factorizes exactly up to NLO) and to this one can sum column 10 as it is plus the non-DY-like (ggZH) contribution.

Rivet Analysis

https://github.com/perrozzi/rivet_analysis_VH_YR4

-- JasonNielsen - 2015-11-30

Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formatroot EWK_corrections_VH.root r1 manage 740.3 K 2016-02-16 - 12:11 LucaPerrozzi  
Unknown file formatroot QCD_corrections_VH.root r1 manage 795.8 K 2016-04-04 - 23:01 LucaPerrozzi  
Compressed Zip archivetgz QCDdist.tgz r1 manage 347.4 K 2016-04-05 - 12:15 FrancescoTramontano  
Unknown file formatgz VH-NLO-distributions.tar.gz r1 manage 579.7 K 2016-02-09 - 15:51 StefanDittmaier HAWK-results
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Topic revision: r17 - 2016-09-19 - LucaPerrozzi
 
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