The NLO DGLAP extraction of alpha_s and higher twist terms from CCFR xF_3 and F_2 structure functions data: results and scale dependence

Abstract

We perform a detailed NLO analysis of the combined CCFR xF_3 and F_2 structure functions data and extract the value of alpha_s, parameters of distributions and higher-twist (HT) terms using a direct solution of the DGLAP equation. The value of alpha_s(M_Z)=0.1222\pm 0.0048 (exp) \pm 0.0026 (theor) is obtained. Our results has a larger central value and errors than the original one of the CCFR collaboration due to model independent parameterization of the HT contributions. The dependence of HT contributions on the QCD renormalization scale is studied.

Figures (1)

• Figure 1: The high-twist contribution to the structure functions $F_2$$F_3$. Full circles correspond to the fit with renormalization scale parameter $k_R=1$, empty circles -- to the fit with $k_R=1/4$, squares -- to the fit with $k_R=4$.