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Fine structure of the QCD string spectrum.

K Jimmy Juge1, Julius Kuti, Colin Morningstar

  • 1Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.

Physical Review Letters
|May 7, 2003
PubMed
Summary
This summary is machine-generated.

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Advanced lattice quantum chromodynamics reveals three scales in gluon field excitations around quark-antiquark pairs. These scales show transitions from local operators to string-like excitations, informing effective bosonic string theories.

Area of Science:

  • Quantum Chromodynamics (QCD)
  • Hadron Spectroscopy
  • Lattice Field Theory

Background:

  • Understanding the behavior of the gluon field is crucial in Quantum Chromodynamics.
  • The excitation spectrum of the gluon field around static quark-antiquark pairs is complex and not fully understood.
  • Previous studies have explored various aspects of this spectrum, but a clear multi-scale picture has been lacking.

Purpose of the Study:

  • To establish distinct scales in the excitation spectrum of the gluon field.
  • To investigate the transition from local gluon field operator behavior to string-like excitations.
  • To provide insights for developing an effective bosonic string description of quark-antiquark interactions.

Main Methods:

  • Advanced lattice methods in quantum chromodynamics were employed.

Related Experiment Videos

  • The color source separation R was systematically varied.
  • Analysis focused on the excitation spectrum of the gluon field.

    • Main Results:

    • Three distinct length scales were identified in the gluon field excitation spectrum.
    • Shortest scale: excitations consistent with multipole operator product expansion.
    • Intermediate scale (below 2 fm): dramatic rearrangement of level orderings.
    • Largest scale (2-3 fm): spectrum matches string-like excitations with near asymptotic pi/R string gaps.
    • Fine structure observed in energies provides crucial details.

    Conclusions:

    • The study establishes a multi-scale framework for understanding gluon field excitations.
    • The results bridge the gap between local operator descriptions and string-like behavior.
    • The observed fine structure offers vital clues for refining effective bosonic string models.