Constraints on "Second Order Fixed Point" QCD from the CCFR Data on Deep Inelastic Neutrino-Nucleon Scattering

Abstract

The results of LO {\it Fixed point} QCD (FP-QCD) analysis of the CCFR data for the nucleon structure function $~xF_3(x,Q^2)~$ are presented. The predictions of FP-QCD, in which the Callan-Symanzik $~β~$ function admits a {\it second order} ultraviolet zero at $~α= α_0~$ are in good agreement with the data. Constraints for the possible values of the $~β~$ function parameter $~b~$ regulating how fast $~α_ s(Q^2)~$ tends to its asymptotic value $~α_{0}\ne 0~$ are found from the data. The corresponding values of $~α_{0}~$ are also determined. Having in mind our recent " First order fixed point" QCD fit to the same data we conclude that in spite of the high precision and the large $~(x,Q^2)~$ kinematic range of the CCFR data they cannot discriminate between QCD and FP-QCD predictions for $~xF_3(x,Q^2)~$.