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New Journal of Physics 14 (2012) 013026
Momentum measurement by the Multiple Coulomb Scattering method in the OPERA lead emulsion target
N. Agafonova, D. Autiero1, M. Besnier2, T. Brugiere1, F. Brunet2, G. Brunetti1, A. Cazes1, L. Chaussard1, P. Del Amo Sanchez2, Y. Declais1, M. Dracos3, D. Duchesneau2, J. Favier2, J. Marteau1, A. Meregaglia3, E. Pennacchio1, H. Pessard2, T. Tran1
OPERA Collaboration(s)

A new method of momentum measurement of charged particles through Multiple Coulomb Scattering (MCS) in the OPERA lead emulsion target is presented. It is based on precise measurements of track angular deviations performed thanks to the very high resolution of nuclear emulsions. The algorithm has been tested with Monte Carlo (MC) pions. The results are found to describe within the expected uncertainties the data obtained from test beams. We also report a comparison of muon momenta evaluated through MCS in the OPERA lead emulsion target with those determined by the electronic detectors for neutrino charged current interaction events. The two independent measurements agree within the experimental uncertainties, and the results validate the algorithm developed for the emulsion detector of OPERA.
1 :  IPNL - Institut de Physique Nucléaire de Lyon
2 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
3 :  IPHC - Institut Pluridisciplinaire Hubert Curien
Physique/Physique des Hautes Energies - Expérience

Physique/Physique/Instrumentations et Détecteurs
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