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Related Experiment Videos

Evidence for factorization breaking in diffractive low-Q2 dijet production.

Michael Klasen1, Gustav Kramer

  • 1Laboratoire de Physique Subatomique et de Cosmologie, Université Joseph Fourier/CNRS-IN2P3, 53 Avenue des Martyrs, F-38026 Grenoble, France. klasen@lpsc.in2p3.fr

Physical Review Letters
|December 17, 2004
PubMed
Summary

This study analyzes diffractive dijet production in deep-inelastic scattering, finding factorization breaking only in resolved photon contributions, not direct ones. Results align with theoretical expectations for diffractive scattering.

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Area of Science:

  • High Energy Physics
  • Quantum Chromodynamics
  • Particle Physics

Background:

  • Deep-inelastic scattering (DIS) probes the structure of hadrons.
  • Diffractive processes in DIS are sensitive to the distribution of partons within hadrons.
  • Understanding photon contributions is crucial for DIS analyses.

Purpose of the Study:

  • To calculate diffractive dijet production at next-to-leading order (NLO) in perturbative QCD.
  • To compare theoretical predictions with preliminary H1 Collaboration data from DESY HERA.
  • To investigate factorization breaking and uncertainties in diffractive parton densities.

Main Methods:

  • Next-to-leading order (NLO) perturbative QCD calculations.
  • Inclusion of direct and resolved photon contributions.

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  • Comparison of theoretical predictions with experimental data from H1 at HERA.

    • Main Results:

    • Evidence for factorization breaking is observed exclusively for resolved photon contributions.
    • No evidence for factorization breaking is found for direct photon contributions.
    • No significant normalization uncertainties were found in diffractive parton densities.

    Conclusions:

    • The results support theoretical predictions regarding the cancellation of soft singularities in diffractive scattering.
    • The findings are consistent with previous studies on (almost) real photoproduction.
    • The study clarifies the role of direct and resolved photons in diffractive dijet production.