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Working group for VH calculations

Role of subgroup: conduit for theorists to get information to experiments (and vice-versa).

General information

Topics of interest

Combination of NNLO QCD and NLO EW corrections in parton showers.

  • Short-term proposal: use POWHEG_MiNLO and reweight using YR4 EW correction factors either in the cross-section or differentially in VpT.
  • Longer-term: investigate/encourage authors to collaborate on joint implementation in POWHEG, as has already been done for (simpler) W/Z production.

How can predictions for gg—>VH contribution be improved?

  • try to improve approximation (tension between effectiveness of HEFT and boosted region where gg contribution is large);
  • can we exploit similarities with (very similar) gg—>HH process of G. Heinrich et al;
  • is there any mileage in a direct appeal to the Goldstone equivalence theorem (perhaps applies well enough in boosted region)?

Benchmark existing calculations of gg —> VH

  • Should benchmark existing calculations of gg —> VH, which may contain different treatments and approximations, both with and without matching/merging.

Discuss backgrounds

  • Desire within experiments for more guidance/sharing of experience with background generation and benchmarking in boosted region.
  • General agreement that, while not the focus of this subgroup, we should help to facilitate such discussions.

VH theoretical uncertainties under simplified template cross-section approach (STXS)

  • How should the calculation of uncertainties for VH be handled under simplified template cross-section approach (STXS), c.f. YR4.
  • In particular, correlated uncertainties between jet bins — either using Stewart/Tackmann or other similar approaches.
  • How to apply/extend ggF experience to VH?

Other material

VH page for YR4

useful links

  • the old page of the VH+VBF working group can be found here
  • the old page of the VH working group can be found here
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Topic revision: r1 - 2017-06-09 - LucaPerrozzi
 
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