Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-12-03
Nucl.Phys. B500 (1997) 421-461
Physics
High Energy Physics
High Energy Physics - Theory
48 pages, 7 Postscript figures
Scientific paper
10.1016/S0550-3213(97)00314-3
The off-shell dynamics of the O(3) nonlinear sigma-model is probed in terms of spectral densities and two-point functions by means of the form factor approach. The exact form factors of the Spin field, Noether-current, EM-tensor and the topological charge density are computed up to 6-particles. The corresponding $n\leq 6$ particle spectral densities are used to compute the two-point functions, and are argued to deviate at most a few per mille from the exact answer in the entire energy range below 10^3 in units of the mass gap. To cover yet higher energies we propose an extrapolation scheme to arbitrary particle numbers based on a novel scaling hypothesis for the spectral densities. It yields candidate results for the exact two-point functions at all energy scales and allows us to exactly determine the values of two, previously unknown, non-perturbative constants.
Balog Janos
Niedermaier Max
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