QCD String Spectrum 2002

TL;DR

This paper presents a detailed analysis of the QCD string excitation spectrum, revealing a rapid onset of string formation at 2 fm and discussing the limitations of the Nambu-Goto model in describing observed features.

Contribution

It provides new insights into the spectrum of the QCD string and compares experimental results with effective string theory, highlighting discrepancies with the Nambu-Goto model.

Findings

String formation begins rapidly at 2 fm

Observed fine structure in 1-3 fm range

Nambu-Goto model has deficiencies in spectrum description

Abstract

Results from a comprehensive new analysis on the excitation spectrum of the QCD string are presented. 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--3 fm range are related to effective string theory. The deficiencies of the Nambu-Goto bosonic string model in describing the observed spectrum are briefly discussed.