Difference: CERNYellowReportPageAt14TeV (20 vs. 21)

Revision 212017-04-11 - ReiTanaka

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META TOPICPARENT name="LHCHXSWG"
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  • Cross sections are calculated at NNLO QCD and NLO EW accuracies.
    • Calculations are the same as CERN Report 3, except photon-induced contribution (see below).
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    • Total cross section is calculated from WH→lνH cross section by subtracting photon-induced cross section, and then scaled via BR(W→lν)=0.108535 in NLO EW accuracy.
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    • Total cross section is calculated from WH→lνH cross section by subtracting photon-induced cross section, and then scaled via BR(W→lν)=0.108535 in NLO EW accuracy.
 
  • Program: NNLO QCD (VH@NNLO) and NLO EW (HAWK).
  • QCD scales: μ=μFR=MVH=(pV+pH)2 for QCD part and μ=μFR=MVH+MH for EW part. Uncertainty is estimated in the range 1/3 < μ/MVH < 3 (μF and μR are varied independently).
    • No additional THU nor PU uncertainties assigned.
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    • NOT included for total cross section (agrees with CERN Report 3 numbers within 1%).
    • Included in cross sections for dedicated WH→lνH (l=e,μ or τ) process (we strongly recommend to use these numbers for dedicated analyses).

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pp→WH Total Cross Section (with approximation)

 
mH (GeV) Cross Section (pb) +QCD Scale % -QCD Scale % ±(PDF+αs) % ±PDF % ±αs % W+H (pb) W-H (pb)
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  • Cross sections are calculated at NNLO QCD and NLO EW accuracies.
    • Calculations are the same as CERN Report 3, except photon-induced contribution (see below).
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    • Total cross section is calculated from ZH→llH,ννH cross sections by subtracting photon-induced cross section, and then scaled via BR(Z→ll)=0.0335962 and BR(Z→νν)=0.201030 in NLO EW accuracy.
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    • Total cross section is calculated from ZH→llH,ννH cross sections by subtracting photon-induced cross section, and then scaled via BR(Z→ll)=0.0335962 and BR(Z→νν)=0.201030 in NLO EW accuracy.
 
    • gg→ZH (box-diagram) occurs as a part of NNLO QCD correction and included in the total cross section.
    • ZH cross section went up by +1~2%, due to +22~16% for √s = 7-14 TeV, due to increase in gg→ZH for NLO+NLL QCD corrections (NLO in CERN Report 3).
  • Program: NNLO QCD (VH@NNLO) and NLO EW (HAWK).
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  • Photon-induced contribution of O(1%) or below
    • NOT included for total cross section (agrees with CERN Report 3 numbers).
    • Included in cross sections for dedicated ZH→llH,ννH (l=e,μ or τ) processes (we strongly recommend to use these numbers for dedicated analyses).
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  • For separate cross sections and associated QCD scale uncertainties in qq/qg→ZH and gg→ZH, use
    • σ(qq/qg→ZH) = σ(pp→ZH)@(NNLO QCD + NLO EW, NLO+NLL QCD gg→ZH) - σ(gg→ZH)@(NLO+NLL QCD),
    • Separate QCD scale uncertainties are σ(qq/qg→ZH) or on σ(gg→ZH) are calculated with VH@NNLO program.
    • For MH=125.0 GeV and at √s=14 TeV,
Process Cross Section (pb) +QCD Scale % -QCD Scale % ±(PDF+αs) % ±PDF % ±αs %
pp→ZH 0.9861 +3.8% -3.3% 1.6% 1.3% 1.0%
qq/qg→ZH (all but gg→ZH) 0.8418 +0.4% -0.7% 1.8% 1.6% 0.8%
gg→ZH 0.1443 +25.1% -18.8% 2.4% 1.7% 1.7%

pp→ZH Total Cross Section (with approximation)

 
 
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