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Discussion Points

Discussion Points. Keith Ellis & Beate Heinemann. Big Questions. How well can the Higgs boson couplings to fermions, gauge bosons and to itself be probed at current and future colliders?

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Discussion Points

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  1. Discussion Points Keith Ellis & Beate Heinemann

  2. Big Questions • How well can the Higgs boson couplings to fermions, gauge bosons and to itself be probed at current and future colliders? • How do precision electroweak observables inform us about the Higgs boson properties and/or BSM physics? • What progress is needed in theoretical developments in QCD and EWK to fully capitalize on the experimental data? • What is the best path towards measuring the Higgs potential?

  3. Improvements w.r.t. HL-LHC Kappa-framework EFT-framework

  4. # of “largely” improved H couplings (EFT) 13 quantities in total

  5. # of “largely” improved H couplings (kappa) 12 quantities in total

  6. Discussion points • Probing Higgs coupling at the level of ~0.1-1% very interesting and complementary to direct searches • Significant advances in theory needed to exploit data from hadron and lepton colliders • HL-LHC has reach in probing many H couplings to few % level • All ee colliders achieve major improvement in their first stage already in probing H sector compared to HL-LHC: • At least half of couplings get improved by factor 5 or more • W/Z couplings of H probed to few 10-3 • Lepton colliders less model dependent (BR_untagged, Gamma_H) than hadron collider • FCC-hh improves rare decays by an additional large factor (~10x better than HL-LHC for nearly all) • Electroweak precision observables • Interesting probe of NP if prec. ~100x better than H and complementary • FCC-ee has extensive programme on EWPO at MZ and MW • Capabilities of linear colliders ? Somewhat complementary ? Giga-Z not in current plan. • Higgs self-coupling: • di-Higgs process probes lambda to 50% at HL-LHC => improvements from HE-LHC (~15%), ILC500 (~27%), CLIC (~9%), FCC-hh (~5%) • Single Higgs production at also sensitive through loop effects

  7. Backup Slides

  8. EWK observables: improvement factor WARNING: Information missing in some cases, e.g. CEPC info incomplete, no Giga-Z at LCs (which would add time of course),…

  9. Accelerators relevant to Higgs physics M. Cepeda

  10. Schedules: starting from T0 NB: number of seconds/.year different for different colliders by up to 30%

  11. Schedules: by calendar year

  12. Comparison of Colliders: kappa-framework • Main observations: • hh and eh coll. don’t constrain unless is assumed • Proposed end ep colliders improve w.r.t. HL-LHC by factors of ~2 to 10 • Initial stages of colliders have comparable sensitivities (within factors of 2)

  13. Comparison of Colliders: EFT

  14. Sensitivity to λ: via single-H and di-H production • Di-Higgs: • HL-LHC: ~50% • Improved by HE-LHC (~15%), ILC500 (~27%), CLIC (~9%), FCC-hh (~5%), • Insensitive to other operators • Single-Higgs: • Sensitivity ~35% in global analyses for FCC-ee365, ILC500

  15. Invisible H decays: H→ETmiss • Direct searches dominate sensitivity • HL-LHC will have sensitivity to ~2.6% • e+e- colliders improve to ~0.3% • FCC-hh probes below SM value: ~0.025%

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