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|August 29, 2014
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Summary
This summary is machine-generated.

We developed a new QCD formalism using track functions to precisely calculate charged particle observables, crucial for suppressing pileup contamination at the Large Hadron Collider (LHC). This method accounts for hadronization effects, improving data analysis for high-energy physics experiments.

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Area of Science:

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

Background:

  • Pileup contamination at the Large Hadron Collider (LHC) complicates measurements using charged particles.
  • Track-based observables are not infrared safe in perturbative theory, necessitating hadronization corrections.
  • Existing methods require robust theoretical frameworks to handle nonperturbative effects.

Purpose of the Study:

  • Develop a new theoretical formalism in QCD for calculating track-based observables.
  • Introduce and define nonperturbative 'track functions' to absorb infrared divergences.
  • Improve the precision of measurements at the LHC by accounting for hadronization.

Main Methods:

  • Matching partonic cross sections to nonperturbative track functions.
  • Deriving the field-theoretic definition and renormalization group evolution of track functions.
  • Performing a next-to-leading order calculation for e+e- annihilation into hadrons.
  • Utilizing the PYTHIA parton shower to model track functions and event distributions.

Main Results:

  • The derived renormalization group evolution of track functions shows excellent agreement with the PYTHIA parton shower.
  • A next-to-leading order calculation for the total energy fraction of charged particles was performed.
  • The framework was applied to Higgs plus one jet events, describing track mass distributions.
  • Dimensionless track-based ratios were shown to reduce smearing from hadronization fluctuations.

Conclusions:

  • The developed track function formalism provides a robust method for calculating charged particle observables in QCD.
  • This approach effectively suppresses pileup contamination and accounts for hadronization effects at the LHC.
  • The framework enables more precise measurements of particle production and properties in high-energy collisions.