A Determination Of Alpha-S From The Transverse-Momenta Of Hadrons Produced In Neutrino And Antineutrino Interactions

The W and Q2 dependence of the transverse momentum of the forward-going hadrons in deep inelastic neutrino charged current interactions on neon is studied. The data were obtained by exposing BEBC filled with a Ne/H2 mixture to the CERN SPS wide-band neutrino beam. The data on average transverse momentum are compared to a model which includes first order QCD, intrinsic quark momentum in the nucleon and Fermi motion, as well as a simple model for hadronization. The model is found to describe the data well. Values of alpha-s = 0.16 +/- 0.02 (stat.) +/- 0.02 (syst.) +/- 0.03 (frag.) at an average Q2 of 15.4 +/- 0.4 GeV2/c2 and LAMBDA-MSBAR = 216(-99)+113 (stat.) (-99)-100 (syst.) (-90)+130 (frag.) MeV/c for three flavours are extracted.