# Survey All SM Higgs Production and Decay Processes Campaign

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Survey_all_Higgs_Production_and_Decay_Processes_Campaign
Name
Survey_all_Higgs_Production_and_Decay_Processes_Campaign
Description
Survey all Higgs production and decay processes campaign
Extension
109297849
Owner
Reisaburo Tanaka
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Minutes of Survey All SM Higgs Production and Decay Processes Campaign meeting

February 13, 2014, 14:00 - 15:30
InDico: http://indico.cern.ch/event/297849/
Participants: ~10 (CERN) + ~30 (Vidyo)

1) Introduction (R. Tanaka)
• LHC Higgs XS WG will be restructured to start from April 1st, 2014.
• The aim of this meeting to survey all accessible SM Higgs production and decay at RUN-2, HL-LHC and beyond
• Tentative date for the 1st general meeting on June 12 (Thu.) - 13 (Fri.), 2014, when we can discuss the progress on this.

Discussions
=========

I. Main production processes [H, qqH, VH]

1) ggF
• There could be a progress in N^3LO in near future.
• Question was raised on approximate N^3LO (M. Spira), detailed answer by S. Forte who also explains how N^3LO PDFs are negligible for ggF.
• Both arguments should be investigated in ggH subgroup asap.
• Higgs pT studies for the 2HDM are in the starting/comparing phase in POWHEG in addition to MSSM. (A. Vicini)

2) VBF, WH/ZH
• Hγ+2-jets could be an interesting channel to investigate among HV+2-jets category (V=γ,Z,W). (T. Figy)
• VH+2jets (EW) is under study with MadGraph5_aMC@NLO. VH+2jets (QCD) is available MadGraph5_aMC@NLO. (F. Maltoni)

3) PDF
• PDF4LHC new recommendation with arrival of many NNLO PDF sets?
• A new one foreseeable next spring (J. Houston), but no decrease in the spread should be expected. (S.Forte)
• Maybe top data (ex. rapidity distribution) will give some indication on which set is right/wrong.
• A new WG for gg-PDFs is about to be created, and working on gg->Higgs PDF uncertainty through the Les Houches workshop. (J. Huston)

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II. Associated Higgs production with heavy quarks [ttH/bbH/ccH]

1) ttH
• NLO+PS is available since some time in POWHEL and aMC@NLO, and will be soon
also in SHERPA. (L. Reina)
• EW could be done (M. Spira) but do not expect NNLO QCD, perhaps fragmentation picture could give insights on the way to build approximations.
• Current major interest is ttbar+HF/V+jets, such as ttbb as backgrounds to ttH which are more urgent (L. Reina).
• SM backgrounds calculations are more important than more higher-orders (M.Spira agreed).

2) bbH
• Same comments as above in 4FS (M. Spira) while 5FS could eventually be done a la Anastasiou.
• Plots with uncertainty should (probably) be redrawn (scale variation by 3).
• bbH in 4FS  is under study with MadGraph5_aMC@NLO. (F. Maltoni)

3) ccH
• Numbers can be produced by SUSHI. (R. Harlander)
• ccH in 3FS has large logs, which is more difficult than bbH. (M. Spira)

-> bbH and ccH can be discussed in MSSM subgroup.

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III. Associated Higgs production with single top/bottom quark [tHq, WtH, btH, tH, bH, etc.]

• bq->tHq' is the major channel which amounts to 14% of ttH at 14TeV and some interest in kF=+-1 case. (R. Tanaka)
• tbH etc. are available via MadGraph5 in 4FS/5FS. (F. Maltoni)
• tjH in 4FS/5FS  are both available with MadGraph5_aMC@NLO. (F. Maltoni)
• bH can be calculated in 4FS/5FS, but physically most interesting is in MSSM context at large tanβ.

-> These processes can be discussed in ttH/MSSM subgroups.

------

IV. Higgs boson pair/triple production [HH, qqHH, VHH, ttHH, tjHH, HHH]

1) HH
• Very important channel for HH discovery in RUN-2 and beyond. (R. Tanaka)
• gg->HH can be calculated/generated via HPAIR (M. Spira) and other processes via VBFNLO.
• gg ->HH at NLO and NLO+PS improved by loop effects (including the real loops) is available with MadGraph5_aMC@NLO. (F. Maltoni)
• NNLO gg->HH calculation exists by D. de Florian et al. (R. Tanaka)
• The NNLO calculation is in the EFT and globally rescaled with the Born loop. (F. Maltoni)
• Open question is what to learn from M. Steinhauser et al.(arXiv:1311.7425) on finite top quark mass effect.

2) qqHH (VBF)
• NLO in total/differential in the VBFNLO framework, and public realeas of code soon. (J. Baglio)
• NNLO calculation exists in the structure function approach, but no public code. (J. Baglio)
• The NLO and NLO+PS obtained by MadGraph5_aMC@NLO are published and publicly available. (F. Maltoni)
3) ttHH
• The NLO and NLO+PS obtained by  MadGraph5_aMC@NLO are published and publicly available. (F. Maltoni)

4) tjHH
• The NLO and NLO+PS obtained in the 5FS by MadGraph5_aMC@NLO are published and publicly available. (F. Maltoni)

5) HHH
• Forget about HHH, as inaccessible for HL-LHC or even higher energies (J. Baglio).
• Maybe at 100 TeV? -> paper by Yao...? (M. Spira) Energy does not help, only Lumi (M. Muehlleitner).

-> New HH subgroup being created. MadGraph5 plots are available, THU agreement is needed.

------

V. Higgs production in association with gauge bosons [VVH]

• The NLO and NLO+PS obtained by MadGraph5_aMC@NLO are published and publicly available (F. Maltoni).

-> WH/ZH subgroup can cover this process.

------

VI. Higgs production in association with a gauge boson and two jets [qqHV]

• Interesting channel as qq->HWqq amounts 2% of VBF and 5% of WH. interest for Yb measurement (D. Rainwater 2001).
• The NLO and NLO+PS for HVjj (EW) can be tried with MadGraph5_aMC@NLO.  (F. Maltoni).

-> VBF subgroup can cover this process.

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VII. Gauge boson scattering [WW→WW, WW→HH, etc.]

• Very important processes to probe the physics potential at very high-energy colliders. (R. Tanaka)
• Can be studied via POWHEG VBF, VBF@NLO, MadGraph5_aMC@NLO, Phantom, etc.

-> VBF subgroup can cover this process.

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VIII. Rare process and decay [qq→Hγ, t→cH, etc.] [quarkonia J/Ψ(Υ)+γ, γ/Z/W+P, etc.]

1) BR uncertainty
• PU heavily depends on lattice input, ex. quark mass. (M. Spira)
• Non-perturbative effects (ex. alpha_s) are neglected, expectations too optimistic? (M. Spira)

2) Rare decays
• Probably only channels with photon (to replace Z in the listed channels in VP decays) might be visible.

-> To be followed up in BR subgroup for common framework for THU and PU.

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Minutes taken by CGRS.
There are minutes attached to this event. Show them.
• 14:00 15:30
Discussion material 1h 30m
Speakers: Chiara Mariotti (Torino), Rei Tanaka (LAL)
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