Nonstandard cutoff effects in the nonlinear sigma model

High precision measurements of the renormalized zero-momentum 4-point coupling g_R and of the Luescher-Weisz-Wolff running coupling g(L)=Lm(L) performed with two different lattice actions in the non-perturbative region confirm the earlier observations, that the cutoff effects look linear, in contrast to perturbative considerations. The use of different actions allows one to make a more reliable estimate on the continuum limit. The measurements were done for infinite volume correlation length up to 350. (orig.)SIGLEAvailable from TIB Hannover: RA 2999(01-193) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman