Citation: A. Desai, LHEReader: simplified conversion from Les Houches event files to ROOT format, Phys. Scripta 101 (2026) 231501, DOI: 10.1088/1402-4896/ae7772, arXiv:2603.01489.
A python script to read Les Houches Event (LHE) files and use PyROOT to convert it into a ROOT Tree
The structure of the LHE file is:
Event Level Info: Number of Particles, Status, event weight, scales, alpha_QED, alpha_QCD
Particle Level Info: PDG id, status, mother1, mother2, color1, color2, px, py, pz, energy, mass, lifetime, spin
git clone https://github.com/amanmdesai/LHEReader.git
python LHEReader.py --input input.lhe --output output.root
usage: LHEReader [-h] [--input INPUT] [--output OUTPUT]
Converts LHE files to ROOT Trees
options:
-h, --help show this help message and exit
--input INPUT Input file path and Name (can be .lhe or .lhe.gz)
--output OUTPUT Output file path and Name (.root file)
where input and output refer to the path of the input and output files respectively
The EventLoop/ directory contains an example ROOT C++ macro (EventLoop.cpp) demonstrating how to read the ROOT TTree produced by LHEReader.py and apply event selection to produce histograms and plots.
root -l -q EventLoop.cpp
@article{Desai:2026lst, author = "Desai, Aman", title = "{LHEREADER: simplified conversion from Les Houches event files to ROOT format}", eprint = "2603.01489", archivePrefix = "arXiv", primaryClass = "hep-ph", doi = "10.1088/1402-4896/ae7772", journal = "Phys. Scripta", volume = "101", number = "23", pages = "231501", year = "2026" } References: