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Fine Structure of the QCD String Spectrum

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arxiv hep-lat/0207004 v2 pith:77YKUMCT submitted 2002-07-09 hep-lat

classification hep-lat
keywords spectrumstringexcitationsfieldfinegluonlengthscale
verification ladder T0 review T1 audit T2 compute T3 formal
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Using advanced lattice methods in Quantum Chromodynamics, three distinct scales are established in the excitation spectrum of the gluon field around a static quark-antiquark pair as the color source separation R is varied. On the shortest length scale, the excitations are consistent with states created by local gluon field operators arising from a multipole operator product expansion. An intermediate crossover region below 2 fm is identified with a dramatic rearrangement of the level orderings. On the largest length scale of 2-3 fm, the spectrum agrees with that expected for string-like excitations. The energies nearly reproduce asymptotic pi/R string gaps, but exhibit a fine structure, providing important clues for developing an effective bosonic string description.

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Forward citations

Cited by 5 Pith papers

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