NEW RESULTS ON THE F2 AND R ON THE PROTON AND THE DEUTERON FROM NMC

The New Muon Collaboration (NMC) has measured cross sections of deep i nelastic muon scattering on the proton and the deuteron at incident mu on energies of 90, 120, 200 and 280 GeV. The data cover a wide kinemat ic range of 0.002 < x < 0.60 and 0.5 < Q(2) < 75 GeV2. The F-2 results are compared with those from other fixed target experiments as well a s with recently published HERA data, on F-2 from 1994 run. The agreeme nt is good. In the kinematic range covered by our data, the cross sect ion is sensitive to R for 0.0045 less than or equal to x less than or equal to 0.12. Therefore R could be extracted in this x range, thereby extending the domain where R is measured and improving the precision in the region of overlap with earlier CDHSW measurements. The differen ce R(d) - R(p) was determined from cross section ratio and found compa tible with zero. The structure functions F-2 were also obtained by usi ng the parametrisation of R (R(1990)) from SLAG. This parametrisation is in reasonable agreement with the present data for R. They are also compatible with a perturbative QCD predictions for R calculated with r ecent parametrisations of parton distributions.