4.7 Article

Measurement of observables sensitive to coherence effects in hadronic Z decays with the OPAL detector at LEP

Journal

EUROPEAN PHYSICAL JOURNAL C
Volume 75, Issue 12, Pages -

Publisher

SPRINGER
DOI: 10.1140/epjc/s10052-015-3766-1

Keywords

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Funding

  1. FP7 Marie Curie Initial Training Network MCnetITN [PITN-GA-2012-315877]
  2. Helmholtz Alliance Physics at the Terascale
  3. Marie Curie Intra-European Fellowship [PIEF-GA-2013-628739]
  4. MEXT International Science Research Program
  5. Japanese Society for the Promotion of Science (JSPS)
  6. German Israeli Bi-national Science Foundation (GIF)
  7. Bundesministerium fur Bildung und Forschung, Germany
  8. National Research Council of Canada
  9. Hungarian Foundation for Scientific Research
  10. OTKA [T-038240, T-042864]
  11. NWO/NATO Fund for Scientific Research, The Netherlands
  12. STFC [ST/G00045X/1, ST/J000418/1, ST/L000520/1] Funding Source: UKRI
  13. Science and Technology Facilities Council [ST/L000520/1, ST/G00045X/1, ST/J000418/1] Funding Source: researchfish

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A study of QCD coherence is presented based on a sample of about 397,000 e(+) e(-) hadronic annihilation events collected at root s = 91 GeV with the OPAL detector at LEP. The study is based on four recently proposed observables that are sensitive to coherence effects in the perturbative regime. The measurement of these observables is presented, along with a comparison with the predictions of different parton shower models. The models include both conventional parton shower models and dipole antenna models. Different ordering variables are used to investigate their influence on the predictions.

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