WG2: CP violation in ttH interactions



LHCHWG2 meeting
Zoom Meeting ID
Giacomo Ortona
Alternative hosts
Sarah Heim, Ken Mimasu
Useful links
Join via phone
Zoom URL

Activity 1


Including interference in the multivariate analysis, which only includes pure CP-odd vs. CP-even so far.

We need some participation from experimentalists! Follow up with Haichen for possible experimental involvement




Sample generation:

  • Large sample of ttH events with modified yukawas
  • Use reweighting to parametrise coupling dependence?

Activity 2

More global analyses including, e.g., gg -> H(+nj), to analyse complementarity and overlaps between CPV and CPC effects

See CMS study: 





  • Mini CPV fit: combining e.g. ggH and ttH with ( k_t, \tilde{k}_t, c_g & \tilde{c}_g )
  • First approximation, VBF is SM-like
  • Medium term: include the dipole
  • Dipole: g t tbar & g t tbar h (old pheno study for dipole https://arxiv.org/pdf/1412.6654.pdf). Are there exp studies on this?
  • Higgs CP at ATLAS+CMS https://indico.cern.ch/event/1184945/contributions/5408275/
  • Also some studies using 4tops seem to exist, need to look for them
  • Maybe just use STXS + some CP-sensitive binnings for ggF
  • What to use for ttH?
  • What about tH


Read exp literature to see what it has actually been done and what's still uncovered or can be improved

There are minutes attached to this event. Show them.
    • 3:00 PM 3:20 PM
      CPV in ttH, introduction 20m
      Speakers: Dorival Gonçalves (Oklahoma State University), Henning Bahl, Henning Bahl