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Related Experiment Videos

Strong coupling constant from the photon structure function.

Simon Albino1, Michael Klasen, Stefan Söldner-Rembold

  • 1II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg, Germany.

Physical Review Letters
|September 13, 2002
PubMed
Summary

Researchers determined the strong coupling constant, alpha(s), using photon structure function data. New analyses incorporating data from the Large Electron-Positron Collider (LEP) significantly improved precision, enabling competitive alpha(s) measurements.

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Area of Science:

  • Particle Physics
  • Quantum Chromodynamics
  • High-Energy Physics

Background:

  • The strong coupling constant, alpha(s), is a fundamental parameter in Quantum Chromodynamics (QCD).
  • Accurate determination of alpha(s) is crucial for precision tests of the Standard Model.
  • Photon structure function F(gamma)(2) provides a unique probe for studying alpha(s).

Purpose of the Study:

  • To extract the value of the strong coupling constant alpha(s).
  • To utilize the complete F(gamma)(2) data set from PETRA, TRISTAN, and LEP experiments.
  • To assess the impact of recent LEP data on the precision of alpha(s) determination.

Main Methods:

  • Performed a single-parameter pointlike fit to F(gamma)(2) data at large x and Q(2).
  • Conducted a five-parameter full (pointlike and hadronic) fit to the complete F(gamma)(2) dataset.

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  • Employed next-to-leading order calculations within the MS renormalization and factorization schemes.

    • Main Results:

    • Obtained alpha(s)(m(Z)) = 0.1183 ± 0.0050 (expt) +0.0029/-0.0028 (theor) from the pointlike fit.
    • Obtained alpha(s)(m(Z)) = 0.1198 ± 0.0028 (expt) +0.0034/-0.0046 (theor) from the full fit.
    • Demonstrated that LEP data reduced experimental uncertainty by approximately a factor of 2.

    Conclusions:

    • The inclusion of LEP data has significantly enhanced the precision of alpha(s) determination from F(gamma)(2).
    • A competitive measurement of alpha(s) is now achievable using photon structure function data.
    • These results contribute to precise tests of Quantum Chromodynamics and the Standard Model.