Next-to-Leading Order QCD(Quantum Chromodynamics)-Analysis of EMC (European Muon Collaboration) Deep Inelastic mu p and mu D Scattering Data

摘要

A combined next-to-leading order QCD analysis of the European Muon Collaboration (EMC) mu H/sub 2/ and mu D/sub 2/ scattering data is presented. The nucleon structure functions are given in terms of parton distributions. The Buras-Gaemers method is used to solve the QCD equations for these distributions. The higher twist corrections are not taken into account. As has been shown, their contribution to the structure functions is negligible in the EMC kinematic region. Unlike most of the papers on this subject, the cross section data (not the value for the structure functions obtained from these data by additional extrapolations and assumptions) are fitted. The following values for the QCD scale parameter lambda /sub MS-bar/ are found: lambda /sub MS-bar/=218 +-73 MeV for the non-singlet fit to the data in the range x>0.3 and lambda /sub MS-bar/=65+-20 MeV if the whole x data are fitted. 16 refs.; 2 tabs. (Atomindex citation 19:070972)