Higgs Physics
CMG group involvement in current or recently completed Run 2 analyses
Analysis in progress
- VHcc full run 2 (HIG-21-008, in review): effort mainly driven by CMG for the boosted part of the analysis, that has most of the sensitivity. Huilin Qu, Loukas Gouskos, Michele Selvaggi, Santeri Laurila
- HH → bb bb boosted (B2G-21-001, in review): VBF boosted effort driven by the same CMG team of VHcc, Huilin Qu, Loukas Gouskos, Michele Selvaggi, Santeri Laurila
- Full run 2 Higgs combination (no CADI yet) and later LHC Higgs combination. Current CMG involvement mainly from Andrea Marini (LHC-HCG contact).
Feasibility studies in progress
- H + c production as alternative probe of the Higgs-charm coupling (theory: arXiv:1507.02916), using H → γγ: Nadezda Chernyavskaya, Loukas Gouskos, Michele Selvaggi
Recently completed
- ttH multilepton (HIG-19-008, published): CMG people involved were Giovanni Petrucciani, Marco Peruzzi, who had lead the analysis back in Run 1 and early Run 2; this last iteration was mainly performed by younger blood from other institutes, but CMG still provided (one of) the main analysis frameworks, and some key imputs (e.g. lepton fake rates)
- H → μμ (HIG-19-006, published). Andrea Marini, with his older MIT affiliation, was the coordinator of the H → μμ working group
- HH → bb γγ (HIG-19-018, published), Nadezda Chernyavskaya, with her former ETHZ affiliation, was the main analyer and CADI contact
- partial full run 2 combination (HIG-19-005, PAS). CMG people involved where Andrea Marini (with his older MIT affiliation), and Giovanni Petruccani, contributing to some of the optimization of combine, running fits and writing documentation.
Possible future analysis projects on Higgs & EFT
From the CMG overview talk on Friday 7 May 2021
- Feasibility study for ttHH production with HH → bb γγ
- Feasibility for ttH, H → cc (likely to be done inside the ttH, H → bb analysis)
- Searches for BSM Higgs decays in extended sector models, e.g. H → aa, Za, γa.
- Possibilities of exploring VBF production to increase purity (e.g. VBF to suppress Z + jets background in a H → Za search), or VH to have handles on trigger.
- Opportunities for fancy ML methods for object tagging e.g. to see if we can do better than ATLAS’s arXiv:2004.01678
- Landscape of what’s covered and what not to be seen as new analysis are introduced & completed.
- “Higgs without Higgs“, probe EFT effects in Higgs couplings via tVV production, and along the way establish first evidence for tWZ production (3σ sensitivity for SM could be in reach with full run 2 data)
- Comprehensive probe of EFT effects in multilepton + b-jet final states, from simultaneous probe of ttH, tH, ttW, ttZ, tZ, tWZ, ttHH, tttt.
- Several efforts have been recently done in that direction but more limited in scope: HIG-19-008 (simultaneous ttH, tH, ttW, ttZ cross-sections), TOP-19-001 (EFT in ttH, tH, ttW, ttZ, tZ with simple cut-based analaysis), TOP-21-001 (EFT effects in ttZ and tZ with ML methods, but limited in number of operators and optimized just for exclusion of non-SM values).
- Could also integrate efforts from boosted final states (important for EFT sensitivity), and from other final states.
- Spin off would be also an improved 4-top analysis.
- Several efforts have been recently done in that direction but more limited in scope: HIG-19-008 (simultaneous ttH, tH, ttW, ttZ cross-sections), TOP-19-001 (EFT in ttH, tH, ttW, ttZ, tZ with simple cut-based analaysis), TOP-21-001 (EFT effects in ttZ and tZ with ML methods, but limited in number of operators and optimized just for exclusion of non-SM values).
- Overall CMS EFT combination. Expertise exists in the group for it, from both the analysis and technical side.