The result for the beam momentum for a nominal settings of 450 GeV/c is given in Table 2. The beam momentum is 449.16 ± 0.14 GeV/c, which is −0.19 ± 0.03% lower than the nominal momentum. The accuracy on the beam momentum of 0.03% is dominated by the systematic effects. The intrinsic accuracy is 0.01−0.02%. A more detailed account of the **data** analysis and of the results is given in Reference [5].