**Chair:** Veronica Sanz (VH), Christoph Englert (HH)

**Members:** Fawzi Boudjema, Adam Falkowski, Benjamin Fuks, Florian Goertz, Jose Santiago, Jose Miguel No, Felix Yu, Adam Martin, Ciaran Williams, Ken Mimasu, Alexandra Oliveira, Alberto Tonero, Andrey Katz. **Please add your name if it is missing.**

__Topics for discussion VH:__
     * Analyses
           - ATLAS:  VH(-> bb) in [[http://arxiv.org/pdf/1409.6212.pdf]] 
           - ATLAS: VH(->WW) [[https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2015-005/]]
           - CMS:VH(->bb) [[https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig13012PubTWiki]] and legacy paper [[https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig14009PaperTwiki]]


     * SM contributions to VH at one loop: Fawzi to dig old works on this. recast some one-loop V^3 into h V^2
     * tree-level: 
            - Dilaton, radion exchange: Matching in [[http://arxiv.org/pdf/1502.07352.pdf]]. Ken for form factora.
            - Composite Higgs type spin-one exchange Adam M., Cedric, Andrey, Adam F., Florian. Model with a custodial triplet is proposed e.g. [[http://arxiv.org/abs/1406.7320|1406.7320]]. It predicts large S, so one may need to tweak it to obtain a realistic (fine-tuned) model with a light resonance. 
     * one-loop:
            - 2HDM: Matching in [[http://arxiv.org/pdf/1502.07352.pdf]]. Ken
            - Colored scalars: region of cancellations in gg-> h can be seen in Eq.18 of [[http://arxiv.org/pdf/1207.7355.pdf]], see also [[http://arxiv.org/pdf/1312.3317.pdf]]. Matching colored scalars with EFT in [[http://arxiv.org/pdf/1412.1837v1.pdf]] and [[http://arxiv.org/pdf/1504.02409.pdf]] for non-degenerate stops. Adam M and Felix Andrey
            - Spin-one: From Composite-Higgs type. Alexandra O. 
              - Not possible from MC point of view, I understood that is maybe non relevant in kinematics point of view,  it would act like more terms to the renormalization of three level coupling
     * Pseudo-Observables: VS, FB
     * Presentation of results together with the HXSWG, feducial cross sections: VS, CPE

__Topics for discussion HH:__
  - How big can pp>HH be in concrete UV scenarios 
     * colored scalars (recast MSSM?) : region of cancellations in gg-> h can be seen in Eq.18 of [[http://arxiv.org/pdf/1207.7355.pdf]], see also [[http://arxiv.org/pdf/1312.3317.pdf]]. Matching colored scalars with EFT in [[http://arxiv.org/pdf/1412.1837v1.pdf]] and [[http://arxiv.org/pdf/1504.02409.pdf]] for non-degenerate stops. VS, FY + BSM
     * 2HDM : Matching of the c_6 to 2HDM is in [[http://arxiv.org/pdf/1502.07352.pdf]], Eq 3.41, and Eq. 3.28 in the alignment limit. CPE, BF
     * Scalar fourplet of SU(2)_L only induces c_6 at the tree level (see e.g. http://arxiv.org/abs/1412.8480): FG
     * Setup without relevant operator (mu^2=0) -> large enhancement of pp>HH (factor 2-3), http://arxiv.org/pdf/1504.00355v2.pdf: FG 
  - What is the EFT parameter range expected from such scenarios (-> //deliverable//: c_6 vs Lambda contour plot) CD (composite Higgs), JN (2HDM), CPE, FG
  - How much can we learn from binned distribution at a small expected signal yield (-> //deliverable//: compare differential distributions for H>hh (with m_H large) and EFT, binned log-likelihood hypothesis test to quantify consistency)
     * 5 parameters EFT scan translated to 2D kinematics to set experimental benchmarks https://twiki.cern.ch/twiki/bin/view/Sandbox/NonResonantHHAtLHC
     * Allow combination of different channels by coordinating bins/benchmarks
  - Backgrounds in HH
     * mass resolution of Higgs tagging (CP and CPE)
         * Can we control Z>bbar (-> //deliverable//: estimate, simulate or dig out expected resolution)
         * can we disentangle dim 6 effects from qq>HZ leakage