A physics analysis framework for studying Higgs boson decays to two pseudoscalars (H→aa) using the CROWN (Configurable ROOT Objects With NanoAOD) framework.
This project implements a comprehensive analysis pipeline for searching for Higgs boson decays to two pseudoscalars in high-energy physics data. The analysis is built on the CROWN framework, which provides a flexible and efficient way to process NanoAOD data using ROOT's RDataFrame.
- Multi-era Support: Analysis configuration for 2016preVFP, 2016postVFP, 2017, and 2018 data
- Multiple Decay Channels: Support for muon-muon (mm), electron-electron (ee), and electron-muon (em) final states
- Comprehensive Sample Types:
- Data
- Background processes (ttbar, Drell-Yan, W+jets, diboson)
- Signal samples (Haa)
- Systematic Uncertainties: Built-in support for systematic shifts and uncertainties
- Object Selection: Advanced selection algorithms for photons, leptons, jets, and particle flow candidates
- Scale Factors: Integrated scale factor corrections for data/MC agreement
- Electrons: Selection based on Cut-based ID, isolation, and kinematic requirements
- Muons: Selection using tight ID, isolation, and kinematic cuts
- Photons: Photon identification and isolation for pseudoscalar reconstruction
- Jets: Jet selection with pile-up ID and overlap removal
- Particle Flow Candidates: Used for pseudoscalar and Higgs reconstruction algorithms
The analysis implements several algorithms for Higgs candidate reconstruction:
- ClosestToHiggsMassAlgo: Selects particle combinations closest to the Higgs mass
- FourHardestPFCands: Uses the four highest-pT particle flow candidates
- ChargePairs: Considers charge requirements in particle pairing
The analysis is highly configurable through Python configuration files:
config.py: Main analysis configurationoverlap_conf.py: Alternative configuration for overlap studies
Key configuration parameters include:
- Pile-up reweighting files for different eras
- Scale factor corrections
- Object selection criteria
- Systematic uncertainty definitions
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This analysis is part of the CMS Collaboration's search for exotic Higgs boson decays to pseudoscalars.