WG2: CP violation in ttH interactions

Europe/Zurich
CERN

CERN

Videoconference
LHCHWG2 meeting
Zoom Meeting ID
69232720461
Host
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

 

TODO:

 

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: 

https://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-19-009/CMS-HIG-19-009_Figure_017.png

https://inspirehep.net/literature/1860903

https://inspirehep.net/literature/2688930

 

  • 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

TODO:

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.
    • 1
      CPV in ttH, introduction
      Speakers: Dorival Gonçalves (Oklahoma State University), Henning Bahl, Henning Bahl