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A new method of momentum measurement of charged particles through MultipleCoulomb Scattering (MCS) in the OPERA lead emulsion target is presented. It isbased on precise measurements of track angular deviations performed thanks tothe very high resolution of nuclear emulsions. The algorithm has been testedwith Monte Carlo (MC) pions. The results are found to describe within theexpected uncertainties the data obtained from test beams. We also report acomparison of muon momenta evaluated through MCS in the OPERA lead emulsiontarget with those determined by the electronic detectors for neutrino chargedcurrent interaction events. The two independent measurements agree within theexperimental uncertainties, and the results validate the algorithm developedfor the emulsion detector of OPERA.

Momentum measurement by the Multiple Coulomb Scattering method in the OPERA lead emulsion target