par Agafanova, N.;Vilain, Pierre 
;Wilquet, Gaston ; [et al.]
Référence Journal of Instrumentation, 11, 7, P07022
Publication Publié, 2016-07-25
;Wilquet, Gaston ; [et al.]Référence Journal of Instrumentation, 11, 7, P07022
Publication Publié, 2016-07-25
Article révisé par les pairs
| Résumé : | The OPERA long-baseline neutrino-oscillation experiment has observed the direct appearance of ντ in the CNGS νμ beam. Two large muon magnetic spectrometers are used to identify muons produced in the τ leptonic decay and in νμ CC interactions by measuring their charge and momentum. Besides the kinematic analysis of the τ decays, background resulting from the decay of charmed particles produced in νμ CC interactions is reduced by efficiently identifying the muon track. A new method for the charge sign determination has been applied, via a weighted angular matching of the straight track-segments reconstructed in the different parts of the dipole magnets. Results obtained for Monte Carlo and real data are presented. Comparison with a method where no matching is used shows a significant reduction of up to 40% of the fraction of wrongly determined charges. |
