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.
|Titolo:||Determination of the muon charge sign with the dipolar spectrometers of the OPERA experiment|
|Data di pubblicazione:||2016|
|Appare nelle tipologie:||1.1.1 Articolo su rivista con DOI|