Fine Structure of the QCD String Spectrum

Preprint
Publisher Website
Google Scholar
Abstract
The excitation spectrum of the gluon field between a static quark-antiquark pair is determined as a function of color source separation using advanced lattice methods in Quantum Chromodynamics. A rapid onset of string formation is observed in the spectrum on a length scale of 2 fm, with Dirichlet boundary conditions. The crossover from the short distance spectrum towards string excitations and an observed fine structure in the 1--4 fm range are related to effective string theory and the Nambu-Goto bosonic string is ruled out. The findings in this work are supported by our high precision studies of string formation in three-dimensional Z(2) gauge theory which should help to resolve the apparent Casimir energy puzzle for string scales below 1 fm.

This publication has 0 references indexed in Scilit: