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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics (QCD)
  • Particle Physics

Background:

  • The splitting function is a fundamental property in QCD, detailing parton energy distribution.
  • Direct measurement of the splitting function is hindered by collinear singularity factors.

Purpose of the Study:

  • To investigate a novel jet substructure observable that approximates the QCD splitting function.
  • To experimentally test the 1→2 splitting function using Large Hadron Collider data.

Main Methods:

  • Analysis of public CMS Open Data.
  • Study of two-prong jet substructure.
  • Application of a new observable sensitive to the splitting function at high jet energies.

Main Results:

  • The study successfully utilized CMS Open Data for a physics analysis.
  • The analysis provides a method to probe the QCD splitting function via jet substructure.

Conclusions:

  • Jet substructure measurements offer a viable pathway to directly observe the QCD splitting function.
  • This work demonstrates the potential of CMS Open Data for advancing particle physics research.